More 1x help

JGTR

Hi all, done my research just need to check it's going to work before I commit.

I currently have Specialized Camber running 2x10 with a 11-36 rear cassette, SRAM X9

I want to fit a Sunrace MS3 10 speed 12-42 cassette, will this work with my current rear derailleur or will I encounter problems? Will
I need a new chain if I'm fitting a new cassette?

I could go 11-40 but the 11-42 works out better when I do the maths/ratios.

Thanks, Jay

cooldad

You need to check the capacity of your mech, and you might need a new chain. Depends on the chainring used - measure and see.

JGTR

Thanks, how can I find out the capacity of my mech???

Chain hasn't been used a great deal but as I'm replacing cassette and chainring I'm thinking may be worth replacing

cooldad

Should be on the Sram website, or the docs that came with the mech, or a sellers info online. Depends on the model.

JGTR

SRAM rear derailleur a have a capacity from 37 (short cage) to 45 (long cage). With the single front chainring my range would be 31 with a 11-42 cassette which is well within the max capacity - but what about the actual physical size of the 42 ring? Will the derailleur be able to move that far??????

The Rookie

People are using them on 42T yes, you may need a longer B-screw (many ebay sellers include one), or just use the 11-40 instead and it will be fine.

JGTR

Cheers