me I totally agree with you about the supplied components for the rrp, I got mine for a price that helped me to deal with that fact. Re. the bb... it's definitely a shimano, and a bad one at that... I've never had such a noisy bike before. What is the JIS bb you mention... is this a good product?
Momentum If the cranks are square taper then I would guess that the cranks are JIS taper (the other option is ISO for Italian cranks and that's unlikely).
For square taper BBs you will probably find that you are looking at a Shimano one to be honest. The UN53 and UN52 are absolutely fine and cost about £15. The UN73 and 72 are lighter but otherwise roughly the same and very good quality.
JIS is the measurement of the square taper, not a manufacturer. Shimano will be the best value and easiest to get repacement for your BB. The one that came with your bike must be extremely crap (I'm amazed it comes with RPM cranks), but the ones I receommended above are absolutely fine and will last thousands of miles.
JIS is the measurement of the square taper, not a manufacturer. Shimano will be the best value and easiest to get repacement for your BB. The one that came with your bike must be extremely crap (I'm amazed it comes with RPM cranks), but the ones I receommended above are absolutely fine and will last thousands of miles.