4

I have an old older (not too old) bike that already has disc brakes, but I would like to replace them with a totally new set and new rotors.

How can I determine if a given replacement (caliper and rotor) is plausible my bike, and if so if an adapter will be needed or not, and if it is, what to get?

For the particulars, I have a 2000 GT Zaskar and one brake setup I am considering for example Hope v4 with 203mm front rotors and 183mm rear and would like to know if this would even fit.

front disc rear mount rear disc ![enter image description here][5]

Improve this question
3
  • Upon further research it seems that bikes with disc mounts typically have either "post" or "international", adapters are expected but its probably one of the two
    – derekv
    Feb 3, 2013 at 22:01
  • With photos of the where the brakes meet the frame/fork and where the disks meet the hubs we'll be able to tell you.
    – alex
    Feb 3, 2013 at 23:53
  • Thanks alex, I will have to post photos as soon as I get a chance
    – derekv
    Feb 4, 2013 at 0:38

1 Answer 1

Reset to default
5

Just to enrich this answer, there are the two systems nowadays for mounting the brakes on the fork and frame; these are IS or postmount: http://www.pricepoint.com/TechPages/TECH_Page_Disk_Mount_Types.htm

Normally you can find adapters to use one or the other.

Regarding the disk-hub mounting, there are also two options, - 6-bolt (the name is self-explainable, it is the standard in the market): - or centerlock (Shimano proprietary), which are fixed by a lock ring, similar to the one used to fix the cogset to the rear hub, but on the disk side: http://www.pricepoint.com/TechPages/TECH_Page_Rotor_Types.htm

You have adapters to mount 6-bolt rotors into centerlock hubs, but the opposite is not possible.

Just one final consideration, if you are running a 26" wheel, current brakes allow a huge braking power with relatively small rotor. Nearly nobody would use more than 160mm on 26", unless you are doing freeride or DH.

Regards.

Improve this answer

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Not the answer you're looking for? Browse other questions tagged or ask your own question.