Shims for disc brake adjustment?
08-14-12 | 03:24 AM
#1
Thread Starter
Senior Member
Joined: Mar 2008
Posts: 8,687
Likes: 301
Shims for disc brake adjustment?
Hi all,
I've noticed that something is a bit off in the rear disc brake assembly on my MTB.
Can't tell with certainty if it's frame, the hub, or possibly the adapter. Either way, the adjustment allowed by the caliper isn't enough to get the pads to entirely clear the rotor. It appears that the rotor is sitting too far inboard. Got it (temporarily I hope) sorted by cutting some washers out of sheet metal and sticking them between frame and adapter.
But by trying out another wheel I suspect that it's the hub that's out of spec, so I'd prefer to shim the rotor outwards rather than the caliper inwards to maintain cross-compatibility with other wheels/bikes.
And I'm not entirely happy with the sheet metal shims I bodged together either, a little too thick, and galvanized....
Are there any ready-made shims in various thicknesses available to go under the rotor and around the M6 rotor mount screws available?
I've noticed that something is a bit off in the rear disc brake assembly on my MTB.
Can't tell with certainty if it's frame, the hub, or possibly the adapter. Either way, the adjustment allowed by the caliper isn't enough to get the pads to entirely clear the rotor. It appears that the rotor is sitting too far inboard. Got it (temporarily I hope) sorted by cutting some washers out of sheet metal and sticking them between frame and adapter.
But by trying out another wheel I suspect that it's the hub that's out of spec, so I'd prefer to shim the rotor outwards rather than the caliper inwards to maintain cross-compatibility with other wheels/bikes.
And I'm not entirely happy with the sheet metal shims I bodged together either, a little too thick, and galvanized....
Are there any ready-made shims in various thicknesses available to go under the rotor and around the M6 rotor mount screws available?
08-14-12 | 03:38 AM
#2
Senior Member
Joined: Oct 2007
Posts: 5,773
Likes: 105
From: West Yorkshire, United Kingdom
Shims aren't really used for disc brakes any more, the last I had with any brakes were with a M975 caliper (IS standard), as almost if not all current brakes on the market are post mount (with adaptor for IS mount), and have a lot of freedom available for the movement within the mount before it is tightened up. You don't say what hub you have, but doubt it is out of spec, unless there has been a recall on it, as discs and design have been standardized for the last 15 years, same with the frame unless it's damaged / defective.
You haven't mentioned where the pistons on your calipers are, as often these can push out unevenly, or in the case of mechanical discs, can be pushed out independently or be in a fixed position.
If you are still in need of shims, would look at a hobbyshop carrying RC cars, as they use ultra thin shims, which would work.
You haven't mentioned where the pistons on your calipers are, as often these can push out unevenly, or in the case of mechanical discs, can be pushed out independently or be in a fixed position.
If you are still in need of shims, would look at a hobbyshop carrying RC cars, as they use ultra thin shims, which would work.
08-14-12 | 03:44 AM
#3
Senior Member
Joined: Aug 2006
Posts: 1,898
Likes: 70
08-14-12 | 04:09 AM
#4
Thread Starter
Senior Member
Joined: Mar 2008
Posts: 8,687
Likes: 301
Shims aren't really used for disc brakes any more, the last I had with any brakes were with a M975 caliper (IS standard), as almost if not all current brakes on the market are post mount (with adaptor for IS mount), and have a lot of freedom available for the movement within the mount before it is tightened up. You don't say what hub you have, but doubt it is out of spec, unless there has been a recall on it, as discs and design have been standardized for the last 15 years, same with the frame unless it's damaged / defective.
You haven't mentioned where the pistons on your calipers are, as often these can push out unevenly, or in the case of mechanical discs, can be pushed out independently or be in a fixed position.
If you are still in need of shims, would look at a hobbyshop carrying RC cars, as they use ultra thin shims, which would work.
You haven't mentioned where the pistons on your calipers are, as often these can push out unevenly, or in the case of mechanical discs, can be pushed out independently or be in a fixed position.
If you are still in need of shims, would look at a hobbyshop carrying RC cars, as they use ultra thin shims, which would work.
I'll try a RC shop, thanks.
08-14-12 | 04:10 AM
#5
Thread Starter
Senior Member
Joined: Mar 2008
Posts: 8,687
Likes: 301
Thread
Thread Starter
Forum
Replies
Last Post
bellweatherman
Bicycle Mechanics
16
08-27-17 08:42 PM
Plimogz
Bicycle Mechanics
12
03-01-16 09:54 AM
