Centering XTR Disc Brakes

not sure if the xtr's have a different system, but for xt's, there's a bunch of skinny little
spacers that go between the frame & caliper for centering. adjust the number of spacers to get it
centered right.

John Hood said:

I am having trouble getting my rear disc brake caliper (2003 XTR) to center on the rotor on my
2003 Jamis Dakar Pro. When the wheel is seated correctly the rotor is pressing firmly against the
outside pad and I can see no way of moving the caliper "outboard" to account for this. Note that
the pistons are fully retracted, there are no spacers in the way and the frame is near new with no
hard knocks to put things out of alignment. Any suggestions would be appreciated.

Quoted post said:

Originally posted by John Hood
I am having trouble getting my rear disc brake caliper (2003 XTR) to center on the rotor on my 2003
Jamis Dakar Pro. When the wheel is seated correctly the rotor is pressing firmly against the outside
pad and I can see no way of moving the caliper "outboard" to account for this. Note that the pistons
are fully retracted, there are no spacers in the way and the frame is near new with no hard knocks
to put things out of alignment. Any suggestions would be appreciated.

http://www.shimanoxtr.com/tech_docs/BR-M965-F.pdf
Item #23 spacers should care for centering.

daveornee <[email hidden]> wrote in message

Quoted message said:

shimanoxtr.comBR M965 F.pdfOpen ↗ Item #23 spacers should care for centering.

it sounded to me that the OP was aware of the normal way to center the calipers, as he said the disc
was pressing on the outboard pad. and he said there were no spacers in the way. IIRC, spacers could
only move the caliper further inboard, worsening the problem.

anyways, i could have misunderstood either you or the OP. or coudl have forgotten which side of the
tabs the caliper mounts on. if it were my bike, and there was no other option, and the disc tabs
were misplaced. i bet a little judicious sanding could bring the caliper body where it needs to be,
but youd have to be oh-so-careful to keep things square and plumb. or get a new fork/frame. xtr
parts? dont they generally cost more than the frame anyway😉

anthony

[email hidden] (ant) wrote in message
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Quoted message said:

daveornee <[email hidden]> wrote in message

Quoted message said:

shimanoxtr.comBR M965 F.pdfOpen ↗ Item #23 spacers should care for centering.

it sounded to me that the OP was aware of the normal way to center the calipers, as he said the
disc was pressing on the outboard pad. and he said there were no spacers in the way. IIRC, spacers
could only move the caliper further inboard, worsening the problem.

anyways, i could have misunderstood either you or the OP. or coudl have forgotten which side of
the tabs the caliper mounts on. if it were my bike, and there was no other option, and the disc
tabs were misplaced. i bet a little judicious sanding could bring the caliper body where it needs
to be, but youd have to be oh-so-careful to keep things square and plumb. or get a new fork/frame.
xtr parts? dont they generally cost more than the frame anyway😉

anthony

You are correct that the spacers would move the caliper further inboard and hence place more
pressure on the rotor. I need to move it the other direction. Sanding would work but freaks me out.
Would you suggest sanding the disc mount or the caliper. What about some friendly manhandling of the
disc mount to bend it outwards a bit - like with a derailleur hanger. I am guessing that the
thickness of the metal makes this difficult/impossible.