M9100 XTR

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Duck!
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Re: M9100 XTR

Postby Duck! » Thu May 31, 2018 8:12 pm

From Singletrack World, re: XT 4-pot, Saint & Zee, with my bold:
Update: The original information we received about the difference in piston diameter between the Saint/Zee brake callipers and the new XT 4-pot callipers was incorrect. We can now confirm that the piston diameter is the same between all Shimano 4-pot brake callipers.
That's 17mm & 15mm. Nothing found regarding M9120 XTR Enduro, but it's probable that they will be the same. Some further digging reveals that the new N-series pads are cross-compatible with existing H-series finned and D-series non-finned pads currently found in Saint, Zee & XT 4-pot (and new Deore-level MT520). M9100 XC 2-pot pistons are likely to remain 22mm, consistent with other 2-pot models.

Shimano aren't listing weights for the calipers on their own, rather giving full single brake weight, comprising caliper with pads but no mount adaptor, lever, 800mm hose and 160mm recommended-model rotor with lockring & bolts. With this setup, M9100 is listed as 312g, while M9120 is 385g, vs 316g and 360g for M9000 & M9020 respectively.
I had a thought, but it got run over as it crossed my mind.

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MichaelB
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Re: M9100 XTR

Postby MichaelB » Fri Jun 01, 2018 9:46 am

Duck! wrote:From Singletrack World, re: XT 4-pot, Saint & Zee, with my bold:
Update: The original information we received about the difference in piston diameter between the Saint/Zee brake callipers and the new XT 4-pot callipers was incorrect. We can now confirm that the piston diameter is the same between all Shimano 4-pot brake callipers.


That's 17mm & 15mm. ......


Cool, thanks for that info (confirmation that M820/M640/M8020 are the same), but the 17 & 15mm ?

I could swear that I've read and measured that they are 18 & 16mm in the Zee/Saint ?


I guess the presumption is then that the M9120 will also be the same.

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Duck!
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Re: M9100 XTR

Postby Duck! » Fri Jun 01, 2018 10:38 am

A further dig revealed that M9120 do indeed also use 17 & 15mm pistons, in common with all other current 4-pot models.
I had a thought, but it got run over as it crossed my mind.

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MichaelB
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Re: M9100 XTR

Postby MichaelB » Fri Jun 01, 2018 2:35 pm

Duck! wrote:A further dig revealed that M9120 do indeed also use 17 & 15mm pistons, in common with all other current 4-pot models.


Well, bugger me. Thanks.

Where did you get that info, as it can be hard to find something definitive rather than 2nd hand ? Never seen it in any Shimano specs

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RonK
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Re: M9100 XTR

Postby RonK » Fri Jun 01, 2018 4:01 pm

There is a fair bit of detail in Cycling Tips report.
Cycle touring blog and tour journals: whispering wheels...

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Duck!
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Re: M9100 XTR

Postby Duck! » Fri Jun 01, 2018 7:10 pm

MichaelB wrote:
Duck! wrote:A further dig revealed that M9120 do indeed also use 17 & 15mm pistons, in common with all other current 4-pot models.


Well, bugger me. Thanks.

Where did you get that info, as it can be hard to find something definitive rather than 2nd hand ? Never seen it in any Shimano specs

The Shimano spec sheet is pretty well non-existent on that sort of detail; the only remotely authoritative source I found was Singletrack World, firstly with the article the previous quote is lifted from, then with the related article about M9100.

My Shimano rep was telling me the other day that instead of the big launch presentation of past years, which have been increasingly poorly attended in recent times, they'll do in-house sessions with interested shops. So when he comes around to give me the full works on the new stuff I'll have my vernier ready to measure the pistons. ;-)
I had a thought, but it got run over as it crossed my mind.

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