Originally Posted by
HillRider
The bottom bracket threading is almost certainly English. The bb shell width is either 68 or 73 mm so any appropriate cartridge bottom bracket will work. Other than shell width, the crank you choose will define the needed bb spindle configuration and length.
Correct, the threading will most likely (99% positive) be English, which is 1.37" x 24 threads per inch. Also, you'll probably need to match the spindle length to maintain the proper chainline. You can measure the spindle length (end to end) or a number like "113" (113mm) may be stamped or labelled on the part. For example, a 68x113 bottom bracket is 68mm shell width x 113mm spindle lenght. Then make sure the crank and bottom bracket interface is compatible (square taper or ISIS or Octalink).