shimano XTR m987 brakes

Discuss light weight issues concerning mountain bikes & parts.

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devinci
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by devinci

Has anyone tried em yet? What's you guys take on these new brakes? I know some people dont seem to like magnesium and 2 pieces caliper much. I dont like the idea of being stuck with the shimano icetech rotor, I want to run my own rotors, 6 bolts.

My sram groupset is disapointing me over and over with parts breaking up without much use so I will have my next bike mounted full XTR, the only thing im not sure about is going with the XTR m987 brakes or what seems like a very reliable a trusted version, the m985 ones.

thanks

gt5504b
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Joined: Mon Jun 06, 2011 10:09 am

by gt5504b

I'm very happy with 985s and XT 6-bolt ice tech rotors. Big step up from any previous avid hydros I had been using.

by Weenie


TheRookie
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by TheRookie

You don't have to use the icetech discs with the Shimano brakes, you can use any disc you like.
Impoverished weight weenie wanna-be!
Budget 26" HT build viewtopic.php?f=10&t=110956

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devinci
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by devinci

yep I know.

thing is some people seem to think the new magnesium caliper will be less efficient at dissipating heat then the m985 aluminium one. THe main criticism concerning the new m987 were based around the magnesium caliper and the 2 pieces design

lordconqueror
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by lordconqueror

are you really having so much brake fade on your avids now that you are afraid that you'll have problems with the xtrs? fwiw, i've never heard of anyone cooking their shimano brakes in any races or at any of the trail areas i frequent here in western oregon, but i have seen people loose power on their avid calipers after extended braking. obviously YMMV.

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devinci
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by devinci

no, that is not the question.

The main thing I am pondering is IF going full XTR, will I go with the new m987 brakes or stick with what seems like tried and true m985.

DanW
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by DanW

R2 Bike lists the M-987 caliper and levers at 380g a pair and the M-985 levers and calipers at 450g a pair. The M-985 weight certainly corresponds to my pair and dropping 70g with the new version is very tempting. The only weight saving over M-987 is Formula R1 racing which drops another 20g.

I would love to try XTR M-987 but can offer my thoughts on M-985 and R1's. R1's lost power reasonably quickly on the steep, technical Welsh descents I rode as the brakes overheated even in the middle of Winter causing the pads to glaze and have a low friction shiny surface- not ideal! This was with lightweight rotors which contributed to the issue no doubt so I had to run the stock Formula rotors to get anywhere near decent performance although a bit of overheating came in on repeated longer descents. I have been running the M-985's in a comparably light overall configuration by using lighter rotors and not suffered the same issues so the M-985's appear to deal with longer descents better than R1's in my experience (even XTR+light rotor vs R1+heavy stock rotor). I would have thought you could be happy with either for XC racing where the descents are not so long or technical so the overheating concerns of the 987's shouldn't come in to play I wouldn't have thought.

Bottom line is that the M-985's have been truly fit and forget and have given consistent and reliable braking in all conditions even with super light rotors... but then I guess you already know that. I would be very surprised if the M-987's were noticeably worse as Shimano have such a reputation for performance above all else (forgetting the Ice Tech rotors which delaminate on Alpine descents :D ) and I would be very surprised if you needed to run them with Ice Tech rotors to get the right level of performance out of them. Personally I would buy the 987's if I was buying now but that is more based on trust than experience. Looking forward to any WW reviews of the 987's.

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devinci
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by devinci

thanks DanW

EvoUltimate
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by EvoUltimate

Are they available yet? I stopped by LBS today but the don't have a date for the brakeset yet.

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devinci
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by devinci

maybe not tyet but I think I saw them online

by Weenie


DanW
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by DanW

Using R2bike again as the reference... shipping appears to be mid November in the EU

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