New chain for old bike I came into possession of an old Mongoose 3.5 that I need to buy a chain for. Unfortunately, I know very little about how to properly purchase the correct chain for a bike I can find very little information for. No bike shops around here are available to service it.
The bike has a rear cartridge with 7 speeds and a pedal cartridge with 3 speeds.
I am also not sure if I need to replace anything else. The rust on the derailleurs looks like it can be scraped off and I can clean the rest of the bike.
All you need is a 7-speed chain. You’ll have to shorten it by a few links after purchase (they’re sold excessively long for funkier gear arrangements), which should be done with a specific chain tool. This tool will also be needed in order to remove the current chain.