Its a 12 speed so I guess 6 rear gears not a cassette but the other type.As there is not a LBS within walking distance but are both a Target and a Walmart where I think I can find a standard 3/32 are you saying by "fitted"this chain would have to be adjusted to the right length or just put on the bike?Also I have heard a new chain on old gears could cause problems is this accurate?