Comments on: Shimano Dura Ace 7850 Carbon Wheels

By: Larry

Larry — Thu, 25 Feb 2010 16:42:47 +0000

Has anyone ridden the Tubeless version of this wheel? can it be fitted with standard clinchers as well? Any feedback would be appricated.

thanks

By: Pete Tiley

Pete Tiley — Tue, 03 Nov 2009 11:21:37 +0000

I chose these wheels a few weeks back and have to say I am over the moon. Fast, smooth and light – everything I expected. Nice and discreet too….
No problems with the aforementioned issues or noises, just happy riding that is keeping me right on the back wheel of others, just with less effort.

By: Collin Burns

Collin Burns — Wed, 09 Sep 2009 07:40:38 +0000

I have recently purchased a set of these wheels and have found them the slowest wheels I have ever ridden. The main problem i find is that the hub “stick’s” every time I free wheel I feel myself slowing. When the wheel is in a stand and is pedalled it even engages the cranks. I have stripped the wheel down and the wheel spins fine but when you stop the the hub from spinning it noticeably slows the wheel. I have emailed Shimano and they have not responded and have had one rear wheel replaced and still the same…slow wheel. Also the ratchet is very muffled when free wheeling not like my carbon Dura ACE which really have a loud ratchet…help anyone??

By: sandy

sandy — Sun, 30 Aug 2009 21:30:13 +0000

Does anyone know anything about these wheels? Im getting a new bike that is being shipped as i speak that has these wheels:vuelta xrp pro 30mm rim w/aero spokes w/precision sealed bearings. thx.

By: Andrew Wood

Andrew Wood — Mon, 17 Aug 2009 10:42:37 +0000

I bought a pair of these wheels today and found that they felt very similar to my Mavic ES wheels. I found, at first, that the cassette and the hub were making contact, slowing the wheel when coasting. A spacer has been fitted, and I’m hoping that it will coast with less resistance.

By: ANUAR sAAD

ANUAR sAAD — Mon, 17 Aug 2009 10:14:13 +0000

I was on few hundred KM on this wheel.. yes all riders here seen to share the same .. feel wooble at the reae wheel .. im not sure its a problem of design nature or just the way the wheel feel.. Will get this wheel set trim and test again…

By: Robin

Robin — Mon, 17 Aug 2009 07:40:16 +0000

There are several myths re: wheel stiffness that are being promoted in this review. For any wheels, in-plane stiffness is virtually the same. So, generally for any set of wheels, wheel deflections in-plane are typically only parts of a millimeter. The stiffness variations, in-plane, are lost in the “noise” of tire deflection and damped by the damping of the tire casing and the air inside the tire.The second myth–and this one ties in with the first–is that riders can reliably determine, from the saddle, a value for wheel stiffness. Mavic ran their own studies and found that riders could NOT reliably determine, while riding, the quality of wheel stiffness. I think it’s reasonable to assume that Mavic had access, in its tests, to some very experienced cyclists. I’m not sure what, exactly a carbon wheel is supposed to feel like when climbing. I’ve climbed with 800g wheelsets and 1100g wheelsets. My current wheelset weighs in at 1380g. There is no difference in how any of them climbed, and this observation is backed up by science. Differences in the moment of inertia for any bicycle wheels are pretty small, and what differences there make very little difference in how a bike accelerates. At the Weight Weenies forum, Mark McM demonstrated this idea with his model of a bike/rider system. His model, as well as every other credible model, shows that the acceleration difference between a wheel with a low moment of inertia and one with a high moment of inertia is very, very small.As for the spoke nipples, any differences in drag between internal and external nipples is very small. External nipples are located in an area where air flow is already turbulent from the spokes as a result of wheel rotation and detachment of boundary layer flow from the rim wall. There’s no real consensus on whether spoke nipples should internal or external for best airflow management. There is, however, a clear consensus that it’s easier to true a wheel when you don’t have to remove the tire.

By: Ken Wilkes

Ken Wilkes — Mon, 17 Aug 2009 07:18:08 +0000

Are external nipples on a rim, easier to true? Are the characteristics of comfort and stiffness independent of one another or do they interact,when talking about wheels? Does a lighter wheel come out of true easier?