Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 10-23-06, 06:08 PM   #1
voshchev
Senior Member
Thread Starter
 
Join Date: Mar 2006
Bikes:
Posts: 67
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
A simple question about handlebars

So, the question is probably an easy one, but better safe...

I recently purchased a new set of handlebars, size 25.4 to go into my 26.0 sized stem. I also purchased the necessary shims for the process. Yet, while piecing it all together, I found that the handlebars fit perfectly without the shims. Is this cause for worry or should I just shrug my shoulders and keep riding?
voshchev is offline   Reply With Quote
Old 10-23-06, 06:20 PM   #2
neilG
Senior Member
 
neilG's Avatar
 
Join Date: May 2005
Location: Ventura, CA
Bikes: Madone, De Rosa, Langster, some old Brit track iron
Posts: 441
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Well, I'd have to say there may be a difference between the experienced mechanic's version of "fits perfectly", and the average person's. Is there any play at all when you have the stem on, not tightened, without the shims? Can you get the shims in at all without forcing? Generally speaking, yes to both questions means you need the shims.

If you are using one of the newer type stems with removeable front plate, it's easy to see why it looks like the bars fit without the shims, but they won't be clamped evenly around.
neilG is offline   Reply With Quote
Old 10-24-06, 06:55 PM   #3
urbanknight
In beaurocratic limbo
 
urbanknight's Avatar
 
Join Date: Mar 2006
Location: Los Angeles, CA
Bikes: Specialized Allez, K2 Razorback
Posts: 22,456
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
If you're using a 2 bolt stem, I noticed there's always a gap between the two pieces, which in some cases could be enough to allow a smaller bar.
urbanknight is offline   Reply With Quote
Old 10-25-06, 08:08 PM   #4
mike
Senior Member
 
mike's Avatar
 
Join Date: Jul 2000
Location: Snowy midwest
Bikes:
Posts: 5,392
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
It is reasonable to expect that you could tighten the play out of the .6 mm difference without the need for shims.
mike is offline   Reply With Quote
Old 10-25-06, 08:18 PM   #5
CrossChain
Senior Member
 
CrossChain's Avatar
 
Join Date: Jun 2006
Bikes:
Posts: 2,023
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
It's like buying jeans.......one manufacturer's 25.4 may not quite be another's.
CrossChain is offline   Reply With Quote
Old 10-25-06, 10:43 PM   #6
TallRider
Senior Member
 
TallRider's Avatar
 
Join Date: Oct 2005
Location: Fresno, CA
Bikes:
Posts: 4,118
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Relevant data: do you have a stem with 2-bolt clamp and removable faceplate? These can be more forgiving, but shims are still good to ensure that the curvature of the faceplate and stem interface cleanly match the bar.

I don't think the comparison to buying jeans is apt at all - these are high-tolerance measurements, and nearly all 25.4's I've seen line up with nearly all 25.4 bars, and don't line up with 26.0 bars. These surprisingly small differences matter - my Cinelli XA stem (with a 26.4mm clamp) wouldn't clamp down on a 26.0mm bar.

I'd use the shims anyway, unless it's possible that the stem was mislabeled. I bought a "Zoom" stem from Nashbar that was marketed as a "road" stem with 26.0mm clamp, but it's clearly a 25.4mm clamp, and I'm using it with 25.4mm bars. It'll work with 26.0 b/c the removable 2-bolt faceplate, but the curvature of the faceplate and the stem clamp end line up cleanly with a 25.4mm bar and not with a 26.0mm bar.
TallRider is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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



All times are GMT -6. The time now is 11:55 PM.