When first sitting down with Simon Smart to design a line of aerodynamic wheelsets Enve targeted three distinct performance goals. The shallow climbing (Smart 4.3 Wheels) and mid range all around wheels (Smart 6.7 Wheels) were the first to be released in the spring of 2011. This, the 8.9, targeted at Time Trial and Triathlon usage has been released a year later.
Enve's goal with this wheelset is to provide a wheelset that will perform as well as a disc aerodynamically while maintaining the predictability and handling of a traditional rim and spoke wheelset. What resulted is a rim that is within 5% aerodynamically of the best tested disc. Both sets of data are derived from Smart's testing procedures and involve six bikes of varying tube shapes and a mannequin rider. The handling of the rim is based on Smart's stability index, a steering metric designed to understand the predictability of a wheel in wind. The goal of the Smart Enve System rims is to create a linear relationship between wind and handling. Meaning that a 2mph increase in wind will cause the same increase in torque on the steer tube as the next 2mph increase. The same is for yaw, where a 2 degree increase in yaw will require the same amount of input from the rider to correct as the next 2 degree increase.
If the aerodynamics of the 8.9 are within 5% of the best disc, and let's say around the same range as most discs weight would be the next thing to consider. If a zip disc weighs 950-1,000g and a HED 1,200g it's easy to build an Enve 8.9 well under that. An example build using a .9, CX-Ray spokes and a Tune 170 hub would weigh around 800g, a staggering 16%-33% reduction in weight.
All Enve Smart rims are intended for use in virtually all weather conditions, terrains and disciplines. Using their proprietary molded spoke hole design, Enve ensures maximum strength at the spoke-rim interface while allowing higher spoke tensions that improve wheel reliability. Smart System rims also feature an all new textured sidewall design that improves braking response and thus rider safety. In a departure from their traditional bold decaling, Enve has chosen understated and elegant black decals that vary in appearance depending on light conditions.
Each rim purchase includes Enve internal spoke nipples, an Enve valve extender, and a pair of Enve's proprietary brake pads.
Shipping ENVE Internationally
We can no longer ship ENVE products outside of the United States. We apologize if this inconveniences you.
ENVE Rim Comparison
The following table compares ENVE's rim brake models for a quick and easy analysis. For more information follow the link to our product specific page for the rim or Contact Us to get in touch with one of our professional wheel-builders.
|Model||Depth (mm) Front/Rear||Width (mm) External||Width (mm) Internal||Weight (g) Front/Rear|
|2.2 Tubular||25 / 25||27 / 27||N/A||281 / 281|
|2.2 Clincher Tubeless||25 / 25||27 / 27||18.5 / 18.5||420 / 420|
|3.4 Tubular||35 / 45||26 / 24||N/A||377 / 397|
|3.4 Clincher||35 / 45||26 / 24||18.5 / 16.5||458 / 464|
|4.5 Tubular||48 / 56||27 / 25.5||N/A||370 / 400|
|4.5 Clincher||48 / 56||27 / 25.5||18.5 / 17||475 / 489|
|7.8 Tubular||71 / 80||29 / 27.5||N/A||436 / 468|
|7.8 Clincher Tubeless||71 / 80||29 / 27.5||19 / 19||541 / 578|
|Front 85mm||643 grams|
|Rear 95mm||656 grams|
Rear - Great / Front Not so much
Posted by Unknown
I run these on an Argon 18 E-118 Next for racing and training. The rear is a nice alternative to a Disc for an event where the yaw angle of the wind is problematic. The front is a different story. On my bike it is particularly, no very, susceptible to any head wind at anything more than approx. a 30 degree angle. And it is not just wind but the air displaced by a passing car. The problem isn't so bad when you are on the handlebars but in an aero position you get moved around, significantly - at least I do on my bike. I don't truly know if the 8.9 is faster than the 7.8 but I'd guess that the 7.8 is more stable, at least the front. It's my guess this is why ENVE seems to have discontinued offering the 8.9. In fact, I will probably replace the 8.9 front with a 7.8 front. If there is any negative effect on speed/aerodynamics, the added stability would be well worth it. I'm pretty sure the review on Slow Twitch said something similar