i have a gt aggressor comp 2020 model im looking to buy a bafang bbs02b kit and install it i have no clue what to do and chain ring sizes and teeth etc and some installing it near me would be alot easier for me. my bike has 34teeth but im possibly looking to trade my bike in for another one as it needs new brake pads, chain and cogs as they are worn out and i dont want to pay 800 for the kit and then the bike fully brake. mechanic will be paid i live in rainhill, L35 8PA. would be interested in kit this upcoming december but would like to know everything in advanced