HOT: Active* forum members generally gain 5% discount at starbike.com store!
Weight Weenies
* FAQ    * Search    * Trending Topics
* Login   * Register
HOME Listings Articles FAQ Contact About




Post new topic Reply to topic  [ 16 posts ] 
Go to page 1, 2  Next
Author Message
 Post subject: Shimano slow rolling?
PostPosted: Sun Apr 08, 2012 11:40 pm 
Offline

Joined: Wed Dec 07, 2011 1:26 am
Posts: 400
Location: California's country side
I am just kind of wondering, when I spin the Dura Ace wheels they stop kind of quick and also doesn't let the valve settle to the bottom, they came factory preset and I never touched them. It just seems like they don't roll very fast either, kind of hit a wall at 35-36mph. When I was quite sure my other wheels could reach 39-40mph easy. Is it the bearings or the rim shape? They are great wheels but it's hard to compare with cartridge bearing or more aero shape wheels. They are the clincher version with more boxy rim shape.


Top
 Profile  
 
PostPosted: Mon Apr 09, 2012 12:18 am 
Offline

Joined: Thu Mar 08, 2012 11:43 pm
Posts: 429
Quote:
It just seems like they don't roll very fast either, kind of hit a wall at 35-36mph. When I was quite sure my other wheels could reach 39-40mph easy.


Eh? Same terrain? Same wattage? Same position? How measured?


Top
 Profile  
 
Posted: Mon Apr 09, 2012 12:18 am 


Top
  
 
PostPosted: Mon Apr 09, 2012 1:53 am 
Offline
User avatar

Joined: Thu Nov 24, 2005 2:34 pm
Posts: 450
Location: New Zero Kanada 43° 40' 0" N, 79° 25' 0" W
Shimano DA hubs are as good as any on the market. In fact, they're vastly superior to most. They're cup & cone, so maybe your cones are a bit snug? Worth checking.


Top
 Profile  
 
 Post subject:
PostPosted: Mon Apr 09, 2012 1:54 am 
Offline

Joined: Fri Mar 18, 2005 4:12 pm
Posts: 2306
Location: eh?
Deleted

_________________
swinter wrote:
Mr.Gib got it right


Top
 Profile  
 
PostPosted: Mon Apr 09, 2012 2:00 am 
Offline

Joined: Wed Dec 07, 2011 1:26 am
Posts: 400
Location: California's country side
GonaSovereign wrote:
Shimano DA hubs are as good as any on the market. In fact, they're vastly superior to most. They're cup & cone, so maybe your cones are a bit snug? Worth checking.


Could be right
I was told they would loosen up but never did after some miles


Top
 Profile  
 
PostPosted: Mon Apr 09, 2012 2:44 am 
Offline
User avatar

Joined: Sun Nov 02, 2003 6:48 am
Posts: 1146
Location: Central USA
Won't touch the question regarding rim profile and personal speeds achieved......

Valve at the bottom is an assumed point of reference.....but not all rims are weight toleranced for that to happen - case in point is Bora wheels where Campagnolo places extra material opposite the valve to offset the weight of the valve - therefore those wheels (specifically the ones I have) never come to a stop with the valve at the very bottom.

Cup and cone (such as the higher level wheels from Shimano and Campagnolo) are infinitely adjustable and far superior to cartridge bearings (easier future maintenance, lower drag).

In my experiance, high end cup and cone wheels don't require a break in period. In your case possibly the factory adjustment is less than idea. Do you know how to adjust them as it sounds like that would be a good first thing to play with on your own.....nothing hard to do.


Top
 Profile  
 
PostPosted: Mon Apr 09, 2012 8:32 am 
Offline

Joined: Sat Jul 29, 2006 2:36 am
Posts: 1129
Location: UK
Skewers clamping pressure may require your cones being backed off slightly.
Just make sure there isn't any play when then wheels are fitted in the frame.


Top
 Profile  
 
PostPosted: Mon Apr 09, 2012 9:05 am 
Offline

Joined: Sun Aug 23, 2009 10:15 am
Posts: 106
i'm pretty sure the DA axle design does away with clamping forces acting on the bearings.

My DA C35 needed adjusting off to match the smoothness of my friends Eurus setup, however, even before that i was amazed how quick they rolled but really i doubt that the wheels are knocking of 5mph of your top end that would be an impressive loss... to many variables.


Top
 Profile  
 
PostPosted: Mon Apr 09, 2012 10:33 am 
Offline

Joined: Tue Feb 02, 2010 11:04 am
Posts: 34
i had the same problem...did some servicing to the bearings...still same problem...

did a side by side test with my wife's alex rim...my DA wheels indeed stop faster...

sold it and bought custom wheels with DT240s hub...problem solved!!


Top
 Profile  
 
PostPosted: Mon Apr 09, 2012 11:57 am 
Offline

Joined: Sat Jan 07, 2012 3:21 pm
Posts: 34
Odd. I'd say adjust them as a first try. Should be ever so slight movement of the axel in your hands. Or tight, minus 1/4 turn. Play around with it if your skewers (are they Shimano?) don't make up the difference. An extra pair of hands can help if you're not used to cone adjustments.


Top
 Profile  
 
PostPosted: Mon Apr 09, 2012 12:00 pm 
Offline

Joined: Sat May 12, 2007 3:40 am
Posts: 398
Location: Triange, NC
As others have said, the DA hub/bearing arrangement is as good as they come. I have two sets of C24 wheels and one needed adjustment right off the bat. I think some ship a little tight and its not worth waiting for them to loosen up. Just have them adjusted as its easy, and they will virtually spin forever.


Top
 Profile  
 
PostPosted: Mon Apr 09, 2012 12:26 pm 
Offline
User avatar

Joined: Fri Oct 07, 2011 3:40 pm
Posts: 9
shimano hub indeed have this problem,dura ace ride over 1000km can solve it,it's seem no a big problem,it wouldn't effect you when you cycling


Top
 Profile  
 
PostPosted: Mon Apr 09, 2012 1:32 pm 
Offline

Joined: Sat Dec 13, 2003 2:25 am
Posts: 4439
Location: Canada
+1 on an adjustment issue. The Shimano DA hubs are stalwarts of the industry. If there is a problem after adjusting them, Shimano will make it good. The axel is very stiff. You only need a tiny amount of play off-the-bike. If it is perfectly adjusted off-the bike, you may find it too tight when you install it. Are you test-spinning it in the dropout? When you adjust the bearings, you have to account for the tightness of the skewer, so always test the wheel in the dropout.


Top
 Profile  
 
PostPosted: Tue Apr 10, 2012 5:07 am 
Offline

Joined: Wed Dec 07, 2011 1:26 am
Posts: 400
Location: California's country side
How do I adjust the cone? Normally there is a locknut, so on this one, is it just the 5mm key instead of the lock nut?

Just a tightening torque but doesn't tell me how to adjust it.

Picture included.


Attachments:
7850.jpg
7850.jpg [ 77.94 KiB | Viewed 585 times ]
Top
 Profile  
 
Posted: Tue Apr 10, 2012 5:07 am 


Top
  
 
PostPosted: Tue Apr 10, 2012 8:59 am 
Offline
User avatar

Joined: Sun Jun 12, 2005 10:56 am
Posts: 3177
Location: New Zealand
I think they are land-anchors but they spin really well normally so this is odd.
It could be a folded dust seal, or as others have suggested, over-tight bearing setting (unusual for DA). Check bearing settings by backing the QR right off and re-spinning it then tightening it beyond normal pressures and comparing the 2 spins.
Re adjustment. Back the outer lock-cap off using the allen key while holding the cone in place with a cone spanner. The cone can now spin comparatively easily and you'll be able to "back it off" ( only go about 1/4 turn as the threads are reasonably coarse) then re-lock the lock cap. It only takes about 1 min to do BUT you may have to have a few goes at finding the "sweet spot" where you have perfect clamping force from the QR and no movement at the rim near the brakes but free spinning.

_________________
Used to race....got too wrinkly and old ;) Updated: Racing again! Thought this was unlikely! Eventually, I may even have a decent race!


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 16 posts ] 
Go to page 1, 2  Next


Who is online

Users browsing this forum: Bing [Bot], Google [Bot], hubert222, Lugan, Qman and 47 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

   Similar Topics   Author   Replies   Views   Last post 
This topic is locked, you cannot edit posts or make further replies. Which tubular with low rolling resistance/high protection?

in Road

el condor

2

774

Thu Aug 22, 2013 2:52 pm

laleme View the latest post

There are no new unread posts for this topic. Shimano 6870 or Shimano 9000?

[ Go to page: 1, 2 ]

in Road

Ahillock

17

2038

Mon Jun 09, 2014 8:24 pm

intheknowcycling View the latest post

There are no new unread posts for this topic. Shimano RS80-C24 vs Shimano WH-9000-C24

in Road

cyronix

14

11076

Sat Jan 11, 2014 11:34 pm

Twinning View the latest post

There are no new unread posts for this topic. Shimano RS81 C24 Carbon vs. Shimano Ultegra RS81 24 wheels

in Road

anthonyc20

9

858

Sat Jun 14, 2014 3:19 pm

btompkins0112 View the latest post

There are no new unread posts for this topic. Shimano DA TT Bar End Shifters

in Road

trysixty

3

279

Sat Jan 18, 2014 8:08 pm

legs 11 View the latest post


It is currently Sat Jul 26, 2014 5:13 am

All times are UTC + 1 hour




Advertising   –  FAQ   –  Contact   –  Convert   –  About

© Weight Weenies 2000-2013
hosted by starbike.com


How to get rid of these ads? Just register!


Powered by phpBB