Hiya folks,

I currently have a 3 x 9 SRAM set up and am looking to update as my rear mech got wobbly and my cassette is worn.

Couldn’t resist buying a deal that came up on here a couple of days ago and I now have a rear 10 speed sram x9 shifter and a 10 speed sram xx rear mech coming in the post to me.

Questions..

a) Can I get away with just buying a 10 speed cassette and chain and keeping my old 9 speed chainrings at the front with my 3 speed shifter and front mech?

b) If yes does it matter if I mix shimano and sram 10 speed cassettes and chains?

c) Ideally I want a 11 or 12 – 36 cassette, is there any concensus as to which ones to go for that are as light as possible without getting ridiculous on cost?

Thanks in advance

Paul