Weight Weenies
* FAQ    * Search    * Trending Topics
* Login   * Register
HOME Listings Blog NEW Galleries NEW FAQ Contact About Impressum
It is currently Tue Jan 16, 2018 4:41 pm

All times are UTC+01:00




Post new topic  Reply to topic  [ 18 posts ]  Go to page Previous 1 2
Author Message
PostPosted: Sat Dec 16, 2017 5:42 am 
Offline

Joined: Wed Apr 08, 2009 5:23 am
Posts: 622
Location: Olympic Nat'l Park, WA
TurboKoo wrote:
UpFromOne wrote:
TurboKoo wrote:
I have R9100 tubulars wheels and 25mm Vittoria Corsa’s. Rims are 28mm wide.
28mm at the very edge of the tire bed? Or do they bulge out at the sides for toroidal aerodynamics, and that's where the 28mm is measured?
I measured 28mm from the brake tracks.
My rim is the one on the left
Image
The profile of the tire bed on tubular rims varies wildly. In your spec, it appears there is a rather flat surface on each side for the tire, such that smaller tire might well fit, but you still risk gaps at the sides of a narrower tire.


Top
   
Posted: Sat Dec 16, 2017 5:42 am 


Top
   
 
PostPosted: Sat Dec 16, 2017 4:23 pm 
Offline

Joined: Sat Dec 13, 2003 2:25 am
Posts: 4985
Location: Canada
Listen to Calnago. You are talking about a tubular rim. The width of the brake track is not the dimension you need to look at. What you need to be aware of is the width of the rim bed and its profile in relation to the tubular you are installing. That is why we always recommend test-fitting before gluing. You will be able to see that you have a good fit easily before you lay-down your first layer.

On those rims, you should have no problem with anything between a 23 and a 27.


Top
   
PostPosted: Wed Dec 20, 2017 9:55 pm 
Offline
Moderator

Joined: Tue Jan 17, 2012 4:01 pm
Posts: 1645
Location: Downtown Los Angeles, CA
Further elaborating on Calnago's point about rim bed radius, you need to pay particular attention to your gluing procedure when the rim bed radius is not a perfect match for the tire. From my experience with my last few wheelsets and gluing larger volume tires on, if the tire is sitting high on the rim and not really seated into the channel (think something like this: O>) then from my experience the wheel won't feel very stable descending. I first experienced this back when I had Reynolds 32s and put 28mm Paves on them, bike would wander when descending above 30-35 mph. When I had the CCU, with a rim bed radius that was definitely designed for a 23, I had similar experiences descending with the 25mm tires on it. I remounted the CCU with 27mm Vlaanderen but paid closer attention to the adhesion and the end result was a stable wheelset again.

Even on my Enve, with the Vlaanderen, I had some slight lack of stability when descending. It wasn't bad with the Enve but getting on another wheelset it was apparent that the others felt better going downhill. When I pulled the Vlaanderen off last week, I noticed that the rim channel was pretty much untouched, so the tire was sitting "high."

_________________
Strava
Current Stable. The Snob Machine | The Crumpton
The Ex's. LS Siena: 6.21kg | Parlee Z5 SLi: 5.9kg | LS Xicon: 5.76kg | C59: 5.7kg | Cervelo R5ca: 5.09kg | Fuji Altamira SE - 6.2kg | Scott Foil - 6.2kg | Evo - 5.18kg | LS Classic - 6.7kg


Top
   
Display posts from previous:  Sort by  
Post new topic  Reply to topic  [ 18 posts ]  Go to page Previous 1 2

   Similar Topics   Author   Replies   Views   Last post 
There are no new unread posts for this topic. Wide tubular tires on narrow rims

[ Go to page: 1 2 ]

in Everything wheels

RyanH

24

1988

Thu Nov 02, 2017 11:23 am

Wingnut View the latest post

There are no new unread posts for this topic. DT Swiss 240s x 50mm carbon tubular rims

in For sale - Pictures are mandatory 22-3-13

LeDuke

0

240

Mon Jan 01, 2018 4:46 pm

LeDuke View the latest post

There are no new unread posts for this topic. Caad 10 and Wide Rims

in Everything wheels

tomato89

7

694

Thu Dec 14, 2017 12:54 am

DamonRinard View the latest post

There are no new unread posts for this topic. Parlee Z5 SLi & wide rims

in Road

audiojan

11

1221

Tue Jun 06, 2017 9:21 pm

rst72 View the latest post

There are no new unread posts for this topic. Bontrager speed limit on wide rims

in Road

Attermann

3

486

Mon Aug 07, 2017 5:04 pm

FIJIGabe View the latest post


All times are UTC+01:00


Who is online

Users browsing this forum: No registered users and 10 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:  
cron
Powered by phpBB® Forum Software © phpBB Limited