Originally Posted by
mawn
I don't know him.. i searched for the 30T that fits, but I couldn't find any + L shifter has only 2 shifters (i would replace it if necessary)
in the back there's a 9-speed Cassette 13-23.
42/23 = 1.83 is your current lowest gear ratio.
34/23= 1.48 Gear ratio by changing smallest ring and using current cassette.
42/28= 1.50 Gear ratio by using a 28T largest cogged cassette and NOT changing small ring.
Get a cassette with a 28T largest cog.
It'll give you almost the same lowest gear and is the simplest solution.
Your chain might need to be lengthened 1 inch. Maybe 2?
https://www.amazon.com/Shimano-Casse...g-goods&sr=1-2