I am trying to get an old Rampar R1 back on the road as a fixed gear…no loss since it’s just a Rampar. I thought it would be pretty straight forward till I got to the crankset. I ordered a generic crankset from ebay and the listing said it was for JIS square tapered bottom bracket. My R1 still has its original SR crankset and I thought it was JIS. Today I received the generic ebay crankset and it didn’t come close to fitting on what I thought was my JIS bottom bracket. The original SR crankset slides right in sooooo easily but the new crankset won’t fit at all…way smaller. Could the original SR crankset be ISO instead of JIS?