9 speed / 10 speed rear mech ?

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This topic has 6 replies, 5 voices, and was last updated 12 years ago by thisisnotaspoon.

Viewing 7 posts - 1 through 7 (of 7 total)

9 speed / 10 speed rear mech ?
Trimix
Free Member

Will my 9 speed SRAM really not work with a 10 speed rear cassette ?

Ive heard some say you cant mix them, but dont understand why. Is the indexing not done by the shifter, not the rear mech ? Thats just spring loaded, so the shifter controls the movement.

Or am I missing something and really do need to buy a new mech to go 10 speed.

Posted 12 years ago

chrismac
Full Member

My understanding is you will need a 10 speeder because the geometry of the rear mechs for 10 speed is different to that of 9 speeds so they move a different distance for the same movement of gear cable.

I agree that its a shame that you cant, but I guess the Big S’s saw an opportunity…….

Posted 12 years ago

njee20
Free Member

Do you understand that you can’t use a Shimano shifter with a SRAM mech mech?

It’s exactly the same reason you can’t mix and match 9/10 speed!

Posted 12 years ago

druidh
Free Member

Interesting. I run a 9-speed mech on my 10-speed tourer. All Shimano right enough.

Posted 12 years ago

njee20
Free Member

That’s different, 10 speed road shifters are the same as 9 speed MTB.

Thought we’d finally got the hang of this! There are 4 different ratios, you cannot mix and match without bodging:

Shimano 10 speed road and all 9 speed
Shimano 10 speed MTB
SRAM 9 speed
SRAM 10 speed

Posted 12 years ago

Trimix
Free Member

Chrismac – that make sense. (Im not mixing SRAM and Shimano.)

So its down to the leverage ratios then, but I thought SRAM was 1:1 ?

So one pull of the shifter = same at the mech ?

Posted 12 years ago

thisisnotaspoon
Free Member

Not quite, It’s now slightly less than 1:1. And shimano increaced theirs from 1:2 to something nearly 1:1, but not the same as SRAM.

Whats the consensus on chains/cassettes from differetn brands? Are they the same?

Posted 12 years ago