M9100 XTR

[Duck!]

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.

[MichaelB]

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.

[Duck!]

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

[MichaelB]

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

[RonK]

There is a fair bit of detail in Cycling Tips report.

[Duck!]

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.

[mikgit]

An news on other brands that will be making hubs for the new 12sp? other than SHimano and DT...
Also I hope that one that does doesn't make them silent, I know loads of people dont' like noisy hubs, but I love them.

[Duck!]

DT hubs will likely maintain their clatter, because I believe they'll be making the new spline pattern bodies to be interchangeable with standard Shimano and SRAM XD bodies on their existing hubs. Only Shimano will have the whole "Scylence" mechanism. As for any other hub manufacturers obtaining licences to produce it, I haven't heard of any as yet.

[mikgit]

Here's hoping, not that i'll be in the market for xtr soon (well never say never) but hopefully for XT when it comes.