I want to buy a new hydraulic disc brake for my old mountain bike, which already has a disc brake. As I am very far away from any bicycle shop I want to buy the parts on the internet. The shipping costs will be high, so I don’t want to send anything back.
There are different standards to mount the brakes to the bike. Post mount and IS2000, and I have heard that post mount has different sizes/types, e.g. post mount 6 and 7.
Now what I want to know:
- What do I have to check or measure to be sure, that the new brake fits my bicycle?
- Which adapters do I need (depending on the size of the discs and the type of fixation of the calipers)? Especially, when the new brake has a different disc size than the former one?
- Which screws? Are they standardized and fit on all bikes and brakes independent of bike and brake manufacturer?
I want to know this in general, because I also want to replace the brakes of a friend’s bike with hydraulic disc brakes too.