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I am after some help with choosing a new 20 speed drivetrain for my five spot.
I'm currently running deore 30 speed with a long cage rear mech.
I am looking at going 2 x 10 using slx stuff and have a few questions.
Which slx cassette would be best? 11-34 or 11-36?
Which rear shadow plus rear mech? sgs or gs?
Can I use my existing triple front mech and shifter on a double chainset?
Are there different chain ring options abate on a double chainset? If so what's best?
Sorry for all the questions I just want to make sure I get the right stuff!
Cheers
Steve
"Best" is highly subjective. What's better for me may not be better for you.
FWIW, I'm of the opinion that there's no point in not having 11-36 on a 10spd cassette on a mountain bike. 11-32 and 11-34 just means slightly closer ratios, but seeing as an 11-36 10spd is spaced the same (in ratio terms) as an 11-32 9spd anyway, it would be of no benefit but the extra ratio span generally is, especially on a 1x or 2x setup.
Triple front mech will work with a double ring setup, but not quite as well as a double specific.
Front shifter will be fine, you just only get 2 of the 3 clicks.
For most riders a 26/38 double with 11-36 cassette is more than adequate. If you live somewhere particularly hilly, you may want to gear down to 24/36, or if it's quite flat up to a 28/40 or even 30/42 setup up front.
As for the rear mech. "Officially" the SGS can only deal with a max 35T overall difference (meaning 11-34 on a 26/38, but no 11-36 unless you had 26/36), but in practice it's ok on a hardtail with 37-38T overall difference in my experience. On a full sus bike though I'd run the GS because of chain growth.
Ok cheers
How do I set up a triple front shifter to work properly with a front double chainset?