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


Go Back   > >

Folding Bikes Discuss the unique features and issues of folding bikes. Also a great place to learn what folding bike will work best for your needs.

Reply
 
Thread Tools Search this Thread
Old 01-05-09, 10:48 PM   #1
>>ECB<<
Senior Member
Thread Starter
 
Join Date: Nov 2008
Bikes:
Posts: 69
M-bar slipping on Brompton: advice?

Lately, I've been having trouble with my M3L's handlebar rotating forward in its clamp whenever I go up the sloping curb of my driveway. Whenever this happens, it prevents me from completely folding the bike (my stubby bar ends hit the brake track, rather than squeaking by the tire). It doesn't seem like my taking the curb is overly abusive, either (walking speed with a 140 lb rider), so that's another source of concern.

So far, I've tried degreasing the clamp area with isopropyl alcohol, shimming the clamp with aluminum, and Loctiting the clamp bolt. Unfortunately, the problem has returned, despite all of these attempts at a fix.

Has anyone else had this issue? If so, have you found a way to get the handlebar to stay put?

TIA,

ECB
>>ECB<< is offline   Reply With Quote
Old 01-06-09, 07:09 AM   #2
timo888
...poet...
 
timo888's Avatar
 
Join Date: Jul 2008
Location: Mid-Atlantic USA
Bikes: bikes
Posts: 624
Did you remove the clamp bolt and examine the thread? Do you know how much torque you're applying when you tighten it?
timo888 is offline   Reply With Quote
Old 01-06-09, 05:10 PM   #3
>>ECB<<
Senior Member
Thread Starter
 
Join Date: Nov 2008
Bikes:
Posts: 69
Quote:
Originally Posted by timo888 View Post
Did you remove the clamp bolt and examine the thread? Do you know how much torque you're applying when you tighten it?
1) Yes: it does look like there's a bit of metal clogging the very start of the bolt's thread. Now that I think about it, I'm wondering if this may be stripping the clamp threads....

2) I do not know: I don't have a torque wrench. I do know that before I put the shim in, it seemed like I would have to twirl and twirl the bolt before it would tighten. Now, with the shim in, the bolt tightens much more positively after several turns.

ECB

Last edited by >>ECB<<; 01-06-09 at 05:14 PM.
>>ECB<< 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 10:43 AM.