GRX 2x + 11-40T XT cassette - rattling

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ccie6872
Posts: 289
Joined: Wed Jul 15, 2020 10:46 pm

by ccie6872

Was playing around with my GRX today with 30/46 and added the CS-M8000 XT 11-40 cassette. Perfect range for the gnarly hills around here and shifts fairly decent however the cassette rattles like hell. I put it on Terra CLX rear wheel with shimano HG EXP freehub but thinking I either need a spacer or a different free hub for this cassette. Any thoughts?

by Weenie


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spdntrxi
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Joined: Sat Jul 20, 2013 6:11 pm

by spdntrxi

MTB cassette needs the standard spacer if you are using on normal shimano 11sp freehub body.
2019 BMC TM01 Road UCI config 7.36kg

ccie6872
Posts: 289
Joined: Wed Jul 15, 2020 10:46 pm

by ccie6872

spdntrxi wrote:
Sun Jan 23, 2022 8:22 pm
MTB cassette needs the standard spacer if you are using on normal shimano 11sp freehub body.
By chance know the thickness of the spacer? 1.8mm?

spdntrxi
Posts: 4711
Joined: Sat Jul 20, 2013 6:11 pm

by spdntrxi

1.85 I'm thinking..
2019 BMC TM01 Road UCI config 7.36kg

ccie6872
Posts: 289
Joined: Wed Jul 15, 2020 10:46 pm

by ccie6872

following-up on my own post - 1.85mm spacer did the trick.. thank you @spdntrxi!

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ultimobici
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by ultimobici

How’s the shifting, bearing in mind the extra 6 teeth?


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ccie6872
Posts: 289
Joined: Wed Jul 15, 2020 10:46 pm

by ccie6872

ultimobici wrote:
Mon Jan 31, 2022 7:54 pm
How’s the shifting, bearing in mind the extra 6 teeth?


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Quite good.. on a scale from 1-10 its an 8 compared to the 11-34 ultegra casette..

fourfa
Posts: 107
Joined: Mon Sep 26, 2011 3:04 am

by fourfa

I've got 11-40, 46-30, and RX800 rear mech. I concur 8 out of 10. The laggiest shift oddly isn't the 11-13-15 cogs, where the upper pulley is farthest from the cogs, but somewhere in the middle.

The B-screw is far enough out that I adjust it a bit when switching to the 10-36 on my road wheels, but I don't change chain length.

warthog101
Posts: 420
Joined: Wed Sep 25, 2013 10:05 am

by warthog101


fourfa wrote:
The B-screw is far enough out that I adjust it a bit when switching to the 10-36 on my road wheels, but I don't change chain length.
Or is that 11-36?
If not, what cassette and freehub are you using?

fourfa
Posts: 107
Joined: Mon Sep 26, 2011 3:04 am

by fourfa

Nope, 10-36 like I said. SRoad 11-sp cassette, XD driver on DT Swiss 350. One piece milled steel cassette, light (282g, plus XD is lighter than HG), shifts great, very happy with it

warthog101
Posts: 420
Joined: Wed Sep 25, 2013 10:05 am

by warthog101

fourfa wrote:Nope, 10-36 like I said. SRoad 11-sp cassette, XD driver on DT Swiss 350. One piece milled steel cassette, light (282g, plus XD is lighter than HG), shifts great, very happy with it
Thankyou :)
Haven't heard/know anything, about that combo.
Will need to investigate

by Weenie


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