68mm = 6.8cm
6.8cm (divide mm by 10)
S = A/6 S + A = A/6 + A = 68MM 7/6 A = 68MM A = (6/7) times 68MM = 58.286 MM (rounded)
radius is just 1/2 diameter so the answer is 34mm
The recommended size for a 68mm threaded bottom bracket for your bicycle is 68mm.
The recommended size for a bottom bracket to be used with a 68mm bottom bracket shell is 68mm.
7 inch = 17.78 cm
7x12x2.54 = 213.36 cm
The recommended size for an English threaded bottom bracket that is compatible with a 68mm shell width is 68mm.
The recommended size for a BSA threaded bottom bracket that is compatible with a 68mm bottom bracket shell is 68mm.
The recommended size for a bottom bracket to fit a frame with a 68mm BSA bottom bracket shell is 68mm.
I am guessing it is 7 to 15 cm long