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

Go Back   > >

General Cycling Discussion Have a cycling related question or comment that doesn't fit in one of the other specialty forums? Drop on in and post in here! When possible, please select the forum above that most fits your post!

User Tag List

Thread Tools Search this Thread
Old 05-30-03, 09:34 AM   #1
Da Tinker
Can't ride enough!
Thread Starter
Da Tinker's Avatar
Join Date: Aug 2002
Location: south Louisiana
Bikes: IFab Crown Jewel, Giant Defy, Hardtail MTB, Fuji finest, Bianchi FG conversion
Posts: 1,235
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Front Disc Brake & QR Hazard!

Here's the article:

In a nutshell: Due to the standard rear-mounting of disc calibers, there is reaction force trying to pull the axle out of the dropouts, when the brakes are applied. This can overcome the retention force of QR, or cause the QR to loosen during a ride. The faster/heavier you are, the greater the force. Lawyer tabs help, but the QR can loosen to the point where it will pop over the tabs.

Looks like Hope & Sachs had it right with their early designs, which had the caliper in front. This caused the reaction force to push the axle into the dropout.

Legal issues may cause bike makers to be very slow to change this, since a redesign implies that the old design was somehow flawed.
Da Tinker is offline   Reply With Quote

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 08:28 PM.

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.
  • Ask a Question
    get answers from real people!
Click to start entering your question.