shimano dura ace 7850 50mm carbon wheelset any good

flat stick

Shimano Dura Ace 7850 50mm Carbon wheelset do i go for Clincher or tubular? these would be used as race wheels only i like the idea of clinchers so i can reuse the tyres and tubes on training wheels as they get worn or would the tubulars be better the wheels would be used for crits and general road racing so need to be reliable i weigh 13 stone

dennisn

Are they any good? I don't own a pair but DA wheels have a very good reputation.
Tubulars or clinchers? Up to you. My vote goes with the guy who, a few weeks back,
made the comment "If you have to ask which, then it's clinchers for you." Or something to that effect.

Anonymous

Go clincher, most of us dont have the luxury of team cars following us about.

I have just started using Vittoria Corsa Evo Cx clinchers on my Kysriums and thet are excellent. They are the ones which have 320tpi and you can put them up to 145 psi. I raced on them last week and there was a real difference over using GP400s.

Hope this helps.

FransJacques

They're ok but make sure you look at the Reynolds Assault (if you can stomach carbon braking surface), the Hed C2 40s (which are 50mm) and finally the Zipps. Check out some Aeolus 5.0s as well.

The thing about the Shimanos is that the hubs, spokes and nipple are incredble quality. 3/4 buddies have the CL24 clinchers and love them. Only 1 mate has the 50 mm clinchers. They're heavy, Shimano refuses to put a weight limit on their stuff and they test it better than most other companies so you know it'll go the distance. They actually upped the weight intially when they started production in interests of better longevity, I forget where i read that tidbit.

Thing about Shimano is who does their aerodynamics? I suppose that's why you want these things eh? Not because they look cool. So who does Shimano's rim shapes? Who is their big name consultant? Which low speed wind tunnel did they test them at?
Exactly...
In this game you don't keep that stuff quiet and Shimano does which leads me to believe they don't have the best shape in the world. So what are you getting for your £900? I'm dying to be proven wrong but I bet these things ain't all that fast...
If you want cheaper than the 7850 50mm clinchers, check the Madison site for a similar rim with an Ultegra hub - it retails for about £350 or £375 IIRC which is an even cheaper way to get deep dish wheels - excuse me for not calling them "aero wheels" b/c I don't see the credentials.

Anonymous

FransJacques wrote:

They're ok but make sure you look at the Reynolds Assault (if you can stomach carbon braking surface), the Hed C2 40s (which are 50mm) and finally the Zipps. Check out some Aeolus 5.0s as well.

The thing about the Shimanos is that the hubs, spokes and nipple are incredble quality. 3/4 buddies have the CL24 clinchers and love them. Only 1 mate has the 50 mm clinchers. They're heavy, Shimano refuses to put a weight limit on their stuff and they test it better than most other companies so you know it'll go the distance. They actually upped the weight intially when they started production in interests of better longevity, I forget where i read that tidbit.

Thing about Shimano is who does their aerodynamics? I suppose that's why you want these things eh? Not because they look cool. So who does Shimano's rim shapes? Who is their big name consultant? Which low speed wind tunnel did they test them at?
Exactly...
In this game you don't keep that stuff quiet and Shimano does which leads me to believe they don't have the best shape in the world. So what are you getting for your £900? I'm dying to be proven wrong but I bet these things ain't all that fast...
If you want cheaper than the 7850 50mm clinchers, check the Madison site for a similar rim with an Ultegra hub - it retails for about £350 or £375 IIRC which is an even cheaper way to get deep dish wheels - excuse me for not calling them "aero wheels" b/c I don't see the credentials.

The shimano aero rims do pretty damn well in the famed Roues Artisanales test. Check out how well the shallow profile ones do too!!



http://www.rouesartisanales.com/article-15505311.html

taz3611

Checked out a few sets of deep-ish carbon clinchers. After about 6 months of looking, feeling, riding and asking questions, I got a pair of American Classic 58. I love them (see sig for pic)

ADIHEAD

Just buy the buggers and fit a set of Open Corsa Evo CX's with latex tubes I think you'll find one or 2 pro teams use them so they can't be than bad :roll:
I run 7850CL's with mentioned tyre/tube combo and they're totally fantastic

Anonymous

ADIHEAD wrote:

Just buy the buggers and fit a set of Open Corsa Evo CX's with latex tubes I think you'll find one or 2 pro teams use them so they can't be than bad :roll:
I run 7850CL's with mentioned tyre/tube combo and they're totally fantastic

Should I be fitting latex tubes ?

FransJacques

Ah good ol Roues Artisinal - miss that site, he's plugged into the new stuff.

20 watts at 50 km/h from best to worst...why do punters like us bother?

On my last sportive I did 120kms at an avg of 26.4 km/h - give that speed calcs are generally sqaured (cubed? or is that just acceleration? grade 13 physics was a looong time ago) my Hed Ardennes are prob good compromise. I reckon that the "fast" or "truckin' along" feel most people get from aero rims isn't the aeroness of them but the weight of them making the bike feel smooth and less subseptible to micro-accelerations. I was impressed doing a couple 150km/1500 vm rides on some Cosmic SLR clinchers with the carbon tape spokes, those were sweet riding and feeling wheels.

Anonymous

FransJacques wrote:

Ah good ol Roues Artisinal - miss that site, he's plugged into the new stuff.

20 watts at 50 km/h from best to worst...why do punters like us bother?

On my last sportive I did 120kms at an avg of 26.4 km/h - give that speed calcs are generally sqaured (cubed? or is that just acceleration? grade 13 physics was a looong time ago) my Hed Ardennes are prob good compromise. I reckon that the "fast" or "truckin' along" feel most people get from aero rims isn't the aeroness of them but the weight of them making the bike feel smooth and less subseptible to micro-accelerations. I was impressed doing a couple 150km/1500 vm rides on some Cosmic SLR clinchers with the carbon tape spokes, those were sweet riding and feeling wheels.

20 watts in a 1hr TT is a bloody big difference.

In fact, 10 watts is...

However for general riding there won't be too much issue.

You seem to put great stall on shimano's lack of aerodynamic marketing then say it's virtually irrelevant anyway... :?

FransJacques

I know, I just thought the benefits were greater than 20 watts. It adds up mathematically - if you plug 370 watts into an equation of climbing, say, Alpe d'Huez, then pug in 400 watts. Great - there's a time saving there. But that's a math model.

Now in the real world, if you asked me to stay within a 20 watt band on my PT for 1:20, or about the time it takes to do an alpine climb, that would be impossible.

I struggle to keep within a 20 watt band on the trainer, but that's my bad attention span, and the fact that whatever race video I watch, I tend to pedal harder when the race action heats up :-D