Bikeforums.net is a forum about nothing but bikes. Our community can help you find information about hard-to-find and localized information like bicycle tours, specialties like where in your area to have your recumbent bike serviced, or what are the best bicycle tires and seats for the activities you use your bike for.
jamie jamie jam
10-04-07, 12:06 PM
im looking to buy a front disk brake and different disk brakes ive looked at seem to have different mounts such as IS, IS QR, and QR but i dont know which one will fit my hub? also, does the size of the disc rotor matter? and is there any difference to fitting a hydraulic disk than a mechanical disk?
btw its 6 mount hole(?dont know the terminology?) hope sport hub incase that matters.
10-04-07, 01:08 PM
There's a good discussion of this on wikipedia. There's basically three variables: disc hub mount, disc diameter, and caliper mount. The hub and the disc must match so you can bolt the disc to the hub and there are basically two standards - center-loc used by Shimano and an IS six-bolt used by most everybody else. The caliper must be designed for a certain disc diameter (e.g., 160mm). Finally, the caliper must have the proper mounting holes to bolt to the fork leg and there are basically two standards here - IS and post mount, although there is a simple adapter to convert from one to the other.
If you buy a common disc brake kit it will come with matched up caliper and rotor, and probably will have the IS to post-mount adapter, so you just need to make sure you get the right hub. Unless you're going Shimano, you probably will want a six-bolt IS hub.
Hyd vs. mechanical gets into what you have to bolt up on the handlebar - obviously, you have to have a different brake lever to have the master cylinder. If you're doing a retrofit, you probably just want to stick to mechanical and then you can use your existing brake levers.
Avid BB5's and BB7's are very well liked for a mechanical disc brake.
All this from someone who has spec'd some brakes out, but never actually done a retrofit. So keep in mind what you paid for this advice.
jamie jamie jam
10-05-07, 10:53 AM
u answered all my questions in one. thankyou.