Hello everyone I'm new here but I've commuted by road bike for 3 years and I recently purchased an old trek elance 400 reynolds 531 road frame that included the fork and bb square tapered spindle, I intend to convert it to a fixed gear bicycle. My question is how to determine the size of the bb spindle in order to install the correct size crankset or if I would need to replace the bb spindle in order to convert it to fixed gear? The original crank info is: SR SXC-200. I'm quite lost at this stage. Any feedback is much appreciated.