Originally Posted by sweetnsourbkr
My question relates to the disc brake mounting system.
Because the 6-bolt rotor adapter is a thread-on piece, how can one be sure it won't get overtorqued, and thus strip the threads during hard braking?
Since the earliest days of chain-drive bicycles, the single-speed rear cogs have been screwed onto the rear hub and continue to be that way on most current track bikes, either directly or via a thread-on quick-change cog carrier. This method of fixing individual cogs and, later with multiple cogs when the rear derailleur was introduced, was eventually replaced by thread-on freewheels
that were used for decades before the introduction of the splined cassette hub and cassettes in the 70's that you may be more familiar with.
Although I haven't asked, I strongly suspect basic engineering data regarding the load carrying capacity of different thread types and materials coupled with the vast history and experience gained with these thread-on drive-side cogs and freewheels -- to include the very high torque-generating touring-range freewheels -- was the basis for determining rear-wheel braking forces could also be handled by rear-wheel mounted thread-on drum brakes and disc rotors.
The bigger issue with these thread-on disc rotor adapters can be getting them back off if they are not installed using waterproof grease or anti-seize compound on the threads or routinely removed as part of a periodic maintenance regime.
Last edited by TandemGeek; 05-21-08 at 06:01 AM.