Go Back  Bike Forums > Bike Forums > Road Cycling
Reload this Page >

Stem clamp sizing question

Search
Notices
Road Cycling “It is by riding a bicycle that you learn the contours of a country best, since you have to sweat up the hills and coast down them. Thus you remember them as they actually are, while in a motor car only a high hill impresses you, and you have no such accurate remembrance of country you have driven through as you gain by riding a bicycle.” -- Ernest Hemingway

Stem clamp sizing question

Thread Tools
 
Search this Thread
 
Old 09-28-10, 05:47 PM
  #1  
cpjolicoeur
Senior Member
Thread Starter
 
Join Date: Aug 2010
Location: Rhode Island, USA
Posts: 110

Bikes: 2004 Specialized Allez

Likes: 0
Liked 0 Times in 0 Posts
Stem clamp sizing question

I need to buy a smaller stem but I'm a bit confused on the stem clamp sizing. I have an 04 Allez. The steerer tube is 1 1/8" so I know I need a 28.6mm clamp on that end but I'm a little uncertain of what size clamp I need on the handlebar end.

I just have the generic Specialized comp handlebars that came on the bike but I don't know if they are 26 or 31.8mm. I measured around the handlebar clamp area and I got about 8.5cm so I know that can't be right.

How do I find out what size I need?
cpjolicoeur is offline  
Old 09-28-10, 05:56 PM
  #2  
umd
Banned
 
umd's Avatar
 
Join Date: Sep 2005
Location: Santa Barbara, CA
Posts: 28,387

Bikes: Specialized Tarmac SL2, Specialized Tarmac SL, Giant TCR Composite, Specialized StumpJumper Expert HT

Likes: 0
Liked 3 Times in 3 Posts
It's diameter not circumference.

But an easier way to tell than measuring, is are the ends the same diameter as the middle? ends, and the drops where the shifters attach are all the same size, the only only difference is in the clamping area. So if the clamping area is bigger, then you have oversized bars...
umd is offline  
Old 09-28-10, 05:57 PM
  #3  
svtmike
Senior Member
 
Join Date: Oct 2008
Location: Chicago, IL
Posts: 2,745

Bikes: S-Works Roubaix SL2^H4, Secteur Sport, TriCross, Kaffenback, Lurcher 29er

Likes: 0
Liked 0 Times in 0 Posts
8.5 cm circumference / pi ~ 2.6 cm or 26 mm.
svtmike is offline  
Old 09-28-10, 06:00 PM
  #4  
cpjolicoeur
Senior Member
Thread Starter
 
Join Date: Aug 2010
Location: Rhode Island, USA
Posts: 110

Bikes: 2004 Specialized Allez

Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by umd
It's diameter not circumference.

But an easier way to tell than measuring, is are the ends the same diameter as the middle? ends, and the drops where the shifters attach are all the same size, the only only difference is in the clamping area. So if the clamping area is bigger, then you have oversized bars...
Ahh, diameter. Should have figured that one out. Thanks
cpjolicoeur is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
cpsqlrwn
Classic & Vintage
18
02-13-19 07:49 PM
steady407
Singlespeed & Fixed Gear
2
05-16-14 08:38 AM
TurboJ
Classic & Vintage
2
05-11-13 05:12 AM
evilcryalotmore
Singlespeed & Fixed Gear
11
01-24-11 08:39 PM
brian3069
Classic & Vintage
1
10-03-10 08:48 AM

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Your Privacy Choices -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.