Bottom Bracket

[Jramsey]

Ok, I need to buy 2 BB's both for formula frames 1 frame is a Junior minus and the other is a pro XL. The junior I am buying cranks and BB so How do I know what size BB to get with the cranks. And my frame I am using my old cranks and need an isis BB and again need to know BB size 68 by?? And can you have a combination that will not work?? Is there any crank or BB that will not work with a Formula frame. Or any combination there of. I am thinking Bombshell cranks with an FSA BB for the junior Crank lenght about 145 or 150. How do I measureall these factors..

Jason

[scott]

i run a 113 bottom bracket in my sons jr frame with ac cranks not problem with like up of the chain hope it helps