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Crank test #4

Crank test #4

Postby madcow » Thu May 26, 2011 3:29 pm

Welcome back to the 4th installment of the crank shootout.

Note we've dropped Vista from the list since they seem to no longer be around. New cranks that have been added for this round are Ax Lightness Morpheus, Extralite QRC2 and Rotor 3d. The next round will include the new Tune Smartfoot, Thm M3 and hopefully a production version of EE.

Other Notes. There are several changes to the review.

Change 1. First and foremost, errors were corrected. I must have been drunk when I wrote the last review, as there were a lot of typos in the numbers, they were all quite minor and don't really effect the overall picture, but still there were a lot of them, so for that I'm sorry and hope to get them all straight this time.

Change 2. Average deflection will be carried out to 3 decimal places. Previously I only used 2 decimal places in the review so some cranks appeared to be equal when in reality there were small differences. The actual testing was carried out to 3 decimal places so it seems ideal to take advantage of those small differences.

Change 3. We wanted to go to a more universal stiffness to weight ratio so we are once again changing it. I ran the numbers and it doesn't change the order that cranks finished in previously nor does it really change the margins between them but it might be a bit more universal. ((1/average deflection)/weight)x100

So on to the review. These are the cranks we'll be looking at for part 4 of this review, in alphabetical order.
1. Ax Lightness Morpheus
2. Campag Record UT
3. Easton EC90
4. EE
5. Extralite QRC
6. Extralite QRC2
7. FSA K-Force Light
8. FSA SLK-Light
9. Kcnc Ktype
10. Lightning SL
11. Lightning HD
12. PMP MicroII
13. Rotor 3d
14. Shimano Dura Ace
15. Sram Red
16. Storck Powerarm SL
17. Stronglight Fission
18. Stronglight X-wing
19. Thm Clavicula
20. Tune Fast Foot 6pack
21. Zipp Vuma quad

A couple of notes on how the deflection testing was done. Each arm was preloaded with 50lbs. From there another 200 lbs was added and the difference was measured in inches. Each arm was tested twice and an average of those two measurements is what I will post. A lower number represents a stiffer crank. These will be labeled as Deflection-D(Drive side deflection) and Deflection-ND(non-drive side deflection)

NOTE #2We have now added a corrected weight to even the comparison in weight of sets. All corrected weights are complete with BB and using TA rings. In some cases we mounted a set of TA rings, in other cases we weighed the stock rings and corrected the total to represent the TA set of rings. We feel this gives a more even comparison of differences in the cranks and less of that in the rings. TA rings are available for almost every crank in this test with the exception of 2(XWing and Zipp)

Now on to the test.

Ax Lightness Morpheus
Claimed Weight: 380grams
Actual Weight: 389grams
Corrected Weight: 513grams
Q-factor: 151mm
Spindle: 30mm
Deflection-D: 0.192
Deflection-ND: 0.345
Average Deflection: 0.268

Likes: Weight. Aesthetics. This is a nice looking crank as a complete unit, however the finish at a detail level does harken to the function over fashion ideal. I particularly like the molded Ax logo which is in a color that's sure to match any bike. Superlight with a good stiffness to weight ratio. Adjustable crank lengths (170, 172.5 and 175 inserts are all included with the crank.) Easy installation and it includes a nicely made tool. Oh, and did I mention that it's light.

Dislikes: 151mm Qfactor, I'd like to see it narrower. Price. Like some of the other superlights this one too has a weight limit.

Neither like nor dislike: Durability. Obviously this crank is light and Ax is known for pushing the limits of what could or should be done. It will be interesting to see what kind of long term durability a crank this light has. I also wonder if the pedal inserts will become a source for creaking noises. We'll update this review as more long term use reports come in.

Campagnolo Record Ultra Torque
Claimed Weight: 690grams w/bb
Actual Weight: 702grams w/bb
Corrected Weight: 694grams
Q-factor: 145mm
Spindle: 25mm
Deflection-D: 0.163
Deflection-ND: 0.279
Average Deflection: 0.221

Likes: Aesthetics, it's a very simple and clean looking crank. Looks good on almost any bike. Q-factor is 2nd narrowest in the test which is great for most people. The rings shift quality and durability is also near the top of the charts.

Dislikes: Setup. The design requires tight frame tolerances, it's often not a plug and play kind of crank and is known to have issues with creaking noises. Also the proprietary bcd on the compact seems a bit annoying, however I'm giving them the benefit of the doubt in thinking that the compact gained something from the odd length 5th arm. The chainring bolts that are ridiculously priced are well beyond explanation(it's just plain gouging). Also since a very high torque is required to attach the two arms it would be nice if it were a bit easier to find the proper torque wrench attachment(for the price of these cranks the tool should be included.)


Easton EC90
Claimed Weight: 663grams
Actual Weight: 671grams complete
Corrected Weight: 681grams
Q-factor: 146mm
Spindle: 24mm
Deflection-D: 0.200
Deflection-ND: 0.352
Average Deflection: 0.276
S/W: 0.539

Likes: A nice all around crank. Very easy installation. Shifts well and has a decent q-factor. I also liked that the chainring bolts used were allen key backed on a torx front. I like that the non-drive arm obscures the bearing cup by fairing it. I also like the raw functional look of the UD carbon. Ceramic bb option is reasonably priced.

Dislikes: The graphics and pedal insert. For some reason those two aspects give the crank a cheapish look. I also can't understand why someone taking this long to get into the crank market would go with the 24mm spindle rather than a larger spindle. The only reason I can think of for this is that they choose to target the oem module market over building a better crank.


EE Proto
Actual Weight: 669grams
Corrected Weight: 629
Q-factor: 142mm
Spindle: 30mm
Deflection-D: 0.144
Deflection-ND: 0.225
Average Deflection: 0.185
S/W: 0.803

Note: I didn't plan on including this in the test as I only wanted cranks that I could put miles on and have some real world feedback on. It turns out that this is an older prototype and there is already a version after this one, that meant that this one was available for me to use for testing. Please note this crank will not be available for sale I'm including it just for fun.

Likes: In terms of technical function, this is the best balance I've seen yet in a crank. Low weight, high stiffness, very narrow q-factor, fantastic shifting(with DA rings). Having this has only made me hope that they decide to one day put a crank into production again. I also liked how the bearings were retained in the cups with clips making a bearing change much easier than on all the other outboard setups.

Dislikes: Gold, though I suspect there are alternate hardcoats that can be used in other colors. The other complaint I'd have with this as a production crank is that the left and right bearings have different IDs. This is accomplished by a very thin ti shim between a bearing and spindle. Similar to how THM has done it, but in this case it's not bonded to the spindle. It's possible this could lead to creaking issues, but I don't know that is true, nor did I have any noise issues.

Extralite QRC
Claimed weight: 485grams no rings
Actual weight: 484grams no rings
Corrected weight: 615grams
Spindle: 22mm
Deflection-D: 0.206
Deflection-ND: 0.513
Average Deflection: 0.359
S/W: 0.452

Likes: Weight. A really good weight particularly for an alloy crank. I absolutely love the 138mm Q-factor. This is one of very few integrated cranks that give you the ability to adjust the preload on the bearings, another great feature. Far narrower than any other crank. Looks are good, setup is quite easy and the bearings run smooth and long. All in all the ideas and execution are top notch.

Dislikes: I don't like that it is only available in compact. I also would love to see it a bit stiffer. I'd gladly trade a few grams to increase the bb diameter which should stiffen the crank a bit.


Extralite QRC2
Claimed weight: 485grams no rings
Actual weight: 479grams no rings
Corrected weight: 603grams
Spindle: 27mm
Deflection-D: 0.222
Deflection-ND: 0.439
Average Deflection: 0.331
S/W: 0.501

Likes: This is a lot like the original and has all the same likes(weight, q-factor, looks, bearings, setup). Add in the new lighter weight, stiffer design and it's an improvement over an already nice crank. I also really appreciate the self extracting mounting bolt as a nice upgrade over the previous.

Dislikes: Again I don't like that it is only available in compact. I would still like to see it gain a little more stiffness. There also seems to be an issue with the hidden bolt tab needing to be filed with some rings but not others in order to ensure they run true.

FSA K-force Light
Claimed weight: 660grams
Actual Weight: 721grams w/bb
Corrected Weight: 711grams
Q-factor: 147mm
Spindle: 24mm
Deflection-D: 0.164
Deflection-ND: 0.309
Average Deflection: 0.236
S/W: 0.587

Likes: I like that the QFactor has gone narrower with these cranks than the SLK and I like the lower weight. The finish is nice and the cranks look good on most bikes. One detail I did appreciate was the carbon plug that covers the hollow spindle on the drive arm. Although it's a minor detail it does show that they are focusing on improving their line with each generation. Another plus are the ceramic bearings. As I understand it, the bearings are sourced from Ceramic Speed which is known for high quality ceramics.

Dislikes: Maybe I'm being a bit picky here, but why do ceramic cups have to be red? When spending over $500 on a crankset it seems like one should be afforded a neutral color choice. The only other thing I can find to complain about the set we received is that they are only available in compact and a 53t is not available.


FSA SL-K Light
Claimed Weight: 780grams w/bb
Stock Weight: 766grams w/bb
Corrected Weight: 732grams
Spindle: 24mm
Deflection-D: 0.149
Deflection-ND: 0.278
Average Deflection: 0.213
S/W: 0.612
Lateral-D: 0.005

Likes: The best thing I can say about this crank is that it is stiff. Right on par with DA and Campag. It's a nice looking crank and typically has a price that makes it quite a deal for a carbon crank.

Dislikes: Previous versions of their carbon cranks have been unpredictable. The cranks vary in weight by as much as 40-50 grams per set. Often spiders and rings were not true.(however after sampling a a group of the SL-K Light, that does seem to be vastly improved). Rings also could use some improvement in their shifting quality and a reduction in q-factor would be nice.


Kcnc Ktype
Claimed Weight: 740grams
Actual Weight: 706grams
Corrected Weight: 674grams
Q-factor: 145mm
Spindle: 24mm
Deflection-D: 0.223
Deflection-ND: 0.407
Average Deflection: 0.315
S/W: 0.450

Likes: Price, this is the least expensive crank we tested. Shift quality is quite high. Bearing quality is good and installation is very easy. Definitely a great bargin in terms of 700gram cranks.

Dislikes: I'd like to see a version with a bit more stiffness, perhaps with a 30mm spindle.


Lightning SL
Claimed weight: 445grams no rings
Actual Weight: 448grams no rings
Corrected Weight: 572grams
Spindle: 30mm
Deflection-D: 0.260
Deflection-ND: 0.355
Average Deflection: 0.307
S/W: 0.542

Lightning HD
Actual Weight: 592grams w/bb
Q-factor: 144mm
Spindle: 30mm
Deflection-D: 0.264
Deflection-ND: 0.361
Average Deflection: 0.313
S/W: 0.519

Likes: I had a very early version of this crank several years ago, and while functionally it was great, the carbon work left alot to be desired in the aesthetics. The change in the appearance was the most striking difference to me. This new version is well built with no real visible flaws in the carbon. I also like that they seem to have aimed at a balanced crank. It hits the middle of the field in almost every category. It's light. It's reasonably priced compared to it's carbon competition. Like the Extralite crank the Lightning has a bb that is preload adjustable, a big plus in my book. Setup is easy and performance is good.

Dislikes: The recessed pedal insert may cause problems of heal rub for some riders, the fix for that is a spacer which could possibly cause problems with not getting enough contact with the pedal threads. I was going to complain about the graphics, but the cranks can be ordered without them. Has a weight limit, a high weight limit but does still carry one. (220lbs SL and 280lbs HD)

The long term reports are coming back now and overall durability seems to be very good. There have been some QC issues which seem to be decreasing in frequency over time, and Lightning has been pretty good about addressing them in the past as they had arisen.


Claimed Weight: 825grams
Stock Weight: 845grams
Corrected Weight: 814grams
Q-factor: 147mm
Spindle: 17mm
Deflection-D: 0.204
Deflection-ND: 0.683
Average Deflection: 0.44
S/W: 0.256

Likes: It's different. I really like that they went a bit off the beaten path to try something different with this crank. The crank looks nice and all the parts fit together well. The setup is very time consuming though it works quite well when done. The chainrings were my favorite part, the machining is great and they function quite well. I like the overall look of the crank as a unit, especially the black one. I also like how the crank arms fit over the outboard cups making for a clean transition.

Dislikes: Stiffness, or lack thereof. This is the least stiff crank we tested as well as also being the heaviest, not a good combination for me. I can't see any reason to use such a small diameter spindle, especially when it's ti. Making that larger could improve the stiffness a bit.


Rotor 3d Steel spindle
Actual weight: 724grams
Corrected weight: 724grams
Spindle: 24mm
Deflection-D: 0.176
Deflection-ND: 0.309
Average Deflection: 0.243
S/W: 0.563

Likes: Looks (this refers to the shape not to the graphics.) Removable spider that can take a power meter. Stiffness. Saab bottom bracket. Separate preload/pinch bolt design that has proven as a concept to be very trouble free.

Dislikes: Stiffness/Weight ratio. Being so incredibly similar in design to the EE prototypes I had expected a lot more from this crank in terms of S/W. The main dislike for me is the graphic package, graphics like these were only half way cool on a trapper keeper back in the 80's and for me lack any retro appeal. But if my biggest complaint about your crank is the graphics package, that can't be a bad crank.


Shimano Dura-Ace
Claimed Weight: 740grams
Stock Weight: 772grams w/bb
Corrected Weight: 746grams
Q-factor: 147mm
Spindle: 24mm
Deflection-D: 0.140
Deflection-ND: 0.295
Average Deflection: 0.217
S/W: 0.597

Likes: Stiffness and shift quality. The shift quality of the DA rings is unmatched by any other crank I've ever tried. Installation is easy and quick and generally without problem. While being heavier than most of the lightweights it's very much a bolt and forget kind of crank. In terms of pure performance, this is the current benchmark for others to aim for.

Dislikes: I'd like to see the weight come down a bit. The looks. Like most, I thought this was the ugliest crank when it came out, however now it seems I've desensitized a bit and only find it somewhat offensive. I guess I found some beauty in function.


Sram Red
Claimed Weight: 760grams
Actual Weight: 755grams
Corrected Weight: 754grams
Q-factor: 150mm
Spindle: 24mm
Deflection-D: 0.150
Deflection-ND: 0.278
Average Deflection: 0.214

Likes: It's a good looking, stiff crank at a good price. The Red crank had one of the lowest average deflections of all cranks we tested. When you add price into the equation it becomes a very balanced crank set. I'd call this crank the sleeper of the test. It was the one that surprised me the most.

Dislikes: Rings. While the rings shift ok, they could definitely stand for some improvements. I'd also like to see the q-factor reduced by at least a few mm, but preferably more. It was also one of the heaviest cranks in the test, only 2 of the 21 cranks weighed more when corrected.


Storck Power Arm SL
Claimed weight: 440grams no rings
Actual Weight: 442grams no rings
Corrected Weight: 581grams
Q-factor: 152mm
Spindle: 30mm
Deflection-D: 0.193
Deflection-ND: 0.314
Average Deflection: 0.253
S/W: 0.663

Likes: I like that they addressed what I felt were several problems with the Clavicula. The end cap does not crack, the insert does not come loose nor do the bearing races. Other than the spindle material being different the cranks seem virtually the same. Functionally it's a great crank. Stiff and lightweight and a triumph of carbon manufacturing(I don't know if this credit should go to Storck for thinking of the changes, or to THM for implementing them for Storck)

Dislikes: The 152mm q-factor and the price tag are two to start. One detail that really bothers me is that the end cap has been redesigned from what THM used. In doing this they have created a new standard that is not an allen key nor is it the shimano end cap tool. It is it's own design with it's own tool. However it seems that their is no specific tool for this. The handle of the bb cup tool works nice or a quarter can work. Support from Storck has been virtually non-existent in the U.S. for a quite a while.


Stronglight Fission Ti
Claimed weight: 795grams
Actual Weight: 754grams w/bb
Corrected Weight: 759grams
Q-factor: 154mm
Spindle: 22mm
Deflection-D: 0.195
Deflection-ND: 0.396
Average Deflection: 0.295
S/W: 0.449

Likes: Looks over the Pulsion are greatly improved. The CT2 rings are some of the best rings. I also like that the pedal fitting is reversible to create arms that are either 172.5 or 175. The adjustable fitting also looks like it won't be subject to de-bonding as the Pulsion did. Muted graphics match any bike.

Dislikes: The very small bearings. By keeping the bearing inside the frame they have used an Isis bearing that has questionable durability and is difficult to find as a replacement, a bad combination. For a ti spindled carbon crank, I'd have expected it to be lighter.


Stronglight X-wing
Claimed Weight: 650
Actual Weight: 737grams
Corrected Weight: 737grams
Q-factor: 146mm
Spindle: 22mm
Deflection-D: 0.181
Deflection-ND: 0.379
Average Deflection: 0.280
S/W: 0.484

Likes: I can't quite put my finger on it, but something about this crank appeals to me. It probably has to do with the shape, aesthetically speaking. I also like the 146/110bcd bolt pattern. This should make for a stiffer ring(both compact and std) which could be an important characteristic when moving to Di2, as well as giving the owners the option of switching back and forth between compact and std without changing cranks. The UD finish is nicely done too.

Dislikes: graphics, especially on the ring, there is just too much writing on the crank/ring. The ugly plastic plugs that cover the multiple chainring bolt sets. I dislike the very thin not easily replaced bb bearings. Wearing out a bearing on a Stronglight crank in the U.S. is not a good thing since the distributor does not usually stock bearings. Standard sized outboard bearings with a larger spindle would be a big improvement in my opinion.


Thm Clavicula
Claimed Weight: 420grams no rings
Stock Weight: 406grams no rings
Corrected Weight: 530grams
Q-factor: 151mm
Spindle: 30mm
Deflection-D: 0.169
Deflection-ND: 0.315
Average Deflection: 0.242
S/W: 0.728

Likes: What's not to like about this crank.? Looks, stiffness, weight, S/W, exclusivity etc... It has it all. It's the pinnacle of what carbon constructed cranks can be. The attention to detail is fantastic. Not many people know this, but there is a built in wear indicator in these cranks. Under the outer layer of carbon is a layer of yellow carbon fiber. If you have heel rub and eventually wear through the outer layer you'll begin to notice the carbon turns yellow indicating it's time to replace your cranks.

Dislikes: What's not to like about this crank? Ok, so perhaps there are a few things. The price, the 151 q-factor, and the availability. The big one for me is the q-factor, they are just a bit too wide for me. And while this is one of the stiffest cranks in the test it's also one of the ones that does have a weight limit.

NOTE: In the past we had some dislikes about bearing sleeves coming loose on the spindles and the same with preload inserts. There were changes in production a while back and we've not seen any of those issues in the last couple of year, taking a great crank and making it even better.


Tune Fast Foot + 6 pack ti
Corrected Weight: 687grams
Q-factor: 154mm
Spindle: 19mm
Deflection-D: 0.292
Deflection-ND: 0.488
Average Deflection: 0.390
S/W: 0.373

Likes: The non-tapered bb means arms don't get stuck easily. Also it has a minimalistic clean look to it and is available in a wide range of colors.

Dislikes: The Q-factor is large, 154. The setup is a complete pain in the... and the stiffness is certainly lacking. I'd love to see Tune take a stab at redesigning and improving on a design they have had for quite a long time. I think the arms could be stiffer as could the bb.


Zipp Vuma Quad
Claimed Weight: 580grams
Actual Weight: 586grams
Corrected Weight: 586grams
Q-factor: 146mm
Spindle: 30mm
Deflection-D: 0.209
Deflection-ND: 0.308
Average Deflection: 0.258
S/W: 0.661

Likes: Weight, stiffness, q-factor, and looks. Again with muted graphics it matches any bike. A solid S/W number being the highest production crank produced outside of Germany.

Dislikes: Rings. The rings could certainly use some work on their shifting ramps and pins. That wouldn't be much of a dislike if I could put TA or Stronglight rings on it, but since I can't it becomes much more of an issue to me. We've also seen what I'd consider a higher number of warranty issues with these than with some of the other superlights.


Here's a couple of pictures of the testing.






This one shows just the average deflection of all the cranks. Lower numbers are better.Image


Here's a ranking of the cranks in order of lightest to heaviest as a complete system with corrected weights:


This one shows S/W. Higher being better stiffness to weight ratio.

So that's it in a nutshell. Some facts, some opinions and some pictures.

Keep an eye out for test 5 which we hope won't be too far off.
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Re: Crank test #4

Postby Juanmoretime » Fri May 27, 2011 2:50 pm

Outstanding as always Jason. My VumaQuads are still serving me well after 3 years but its nice to have to have the data to do research for when the time comes for their replacement!
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Re: Crank test #4

Postby Gumgardner » Fri May 27, 2011 3:18 pm

Yup. Perfect as usual. Nice to see some people still care enough to put a test like this together.
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Re: Crank test #4

Postby sjubbis » Sun Jun 26, 2011 10:50 pm

Great review!
Anyone know if Easton is planning to continue production of the ec90 crankset? Can't even find it on their homepage, as if they're trying to deny it ever being made?!
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Re: Crank test #4

Postby Johnny Rad » Tue Jun 28, 2011 5:06 am

Thanks for your efforts.

On the Vuma, were the OEM rings marked "9/10" or "10/11"? I believe this refers to compatibility with the 10/11 being newer.
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Re: Crank test #4

Postby Juanmoretime » Sun Jul 17, 2011 11:36 am

Are all Sram cranks 150mm Q-Angle? I'm wondering about the Sram Quarq S975.
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Re: Crank test #4

Postby swissdave » Tue Nov 15, 2011 10:14 am

When will come the Crank test #5? I need a new Crankset. Hopefully also the test with Rotor 3d+
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Re: Crank test #4

Postby bacano » Wed Jan 25, 2012 11:21 pm

Its a great work you've done testing the cranks.
Do you have any intentions on doing some tests on MTB cracks?

Deflection n MTB cranks are more pronounced due to the terrain conditions, harder and heavier pedalling, harder cornerings, etc. Would be cool to have that info too.
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Re: Crank test #4

Postby Velofreak » Fri Nov 09, 2012 3:16 am

Please, correct me if I´m worng but, don't you think you should test all crank arms with the same rings? like testing them all with TA rings?

It seems to me that testing a claviculas with an awesome dura-ace hollow ring and then extralite with extralite thin rings will give you un-fair deflection data, considering just the crankarms, right?
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Re: Crank test #4

Postby Ypsylon » Thu Nov 15, 2012 2:38 pm

Well, you need to test something and, remembering there is a bike shop involved with this, testing something with stiff chainrings and selling it with not so stiff chainrings could backfire even more.

The THM cranks come without chainrings and using sort of a benchmark chainring makes sense to me.

Not that it matters too much, but those are not awesome dura-ace hollow rings, they are 7800.
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