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PostPosted: Sat Jan 25, 2014 6:11 pm 
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Location: Canada
having an issue here.

Im using the new shimano m987 brakes with a shimano brake adapter. Can it be possible the adaptor is not compatible? I know it is m985 compatible...

the rear wheel, when installed, will have the rotor rub in the caliper, major rub. I am using a 160mm adaptor and 160mm rotor. What the heck is wrong here?

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PostPosted: Sat Jan 25, 2014 6:40 pm 
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Posts: 480
same problem here on lefty with avid g3 rotor and m820 saint's and shimano adapter.
Solved it by putting a washer in between the caliper and adapter. I'd consider this a temporary hackjob but would like to know the cause and solution.

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PostPosted: Sat Jan 25, 2014 8:02 pm 
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I put a titanium spacer between the caliper and adaptor, seems to do the work just fine. Though I don't consider it an ideal solution.


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PostPosted: Sat Jan 25, 2014 9:03 pm 
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I've used different brand adapters in the past and all seem to raise the front and rear by different amounts. I would have thought they should be standard but they don't seem to be. IIRC the KCNC adapter raised the caliper more than Shimano or Hayes adapters I had lying around. Might be worth trying a different brand adapter perhaps?


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PostPosted: Sat Jan 25, 2014 9:06 pm 
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Thanks Dan

do you think the washer can suffice?

If using a washer under the lower caliper/adaptor bolt, should I also use one on the top bolt to level off the caliper? I think it would push it further out, so far the caliper is not rubbing anymore with the titanium washer under the lower caliper bolt...


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PostPosted: Sat Jan 25, 2014 11:29 pm 
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I don't think using washers is that big a deal, heck Avid supply a bunch of their brakes with multiple convex-concave washers to allow adjustment of the calliper's angle...
If it were me though I'd definitely want to do it symmetrically, ie have an equally think washer under each bolt. Otherwise the calliper is going to be bending the adapter a bit when you tighten it down. Probably not a big deal, just doesn't seem optimal.
If adding a second washer "pushes it too far out", I'd say you should find some thinner washers.
In terms of what is "too far", I think your limit ought to be when the edge of the brake pad reaches the edge of the rotor - you don't want some of the pad hanging off the edge of the rotor or it'll impact performance and likely cause noise.

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PostPosted: Sat Jan 25, 2014 11:39 pm 
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I agree with dwaharvey's suggestion. I wouldn't be too worried using washers but would want the same thickness washers with each caliper bolt. You can get a big bag of Hope branded washers of various thicknesses in the right size which might be the best bet.


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PostPosted: Thu Feb 06, 2014 10:40 pm 
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as already stated, washers are of no concern as Avid use them, and best to use one between adatper and calliper. you can buy shims = thin washers that are used to centralise IS brake callipers.


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