Bicycles are for Children
Join Date: Dec 2010
Location: West Central Indiana
Bikes: The kind with two wheels
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. If you measure from the center of one bolt to the center of the next, you can figure out the Bolt Circle Diameter using Mr. Brown's crib sheet. I have a Sakae SA on one of my bikes, it is most definitely 130mm BCD (which is 76.4 mm from the center of one bolt to the center of the next), but I would double check yours to be sure. I have found chainrings for this BCD on ebay, they are pretty common and I picked up a decent used one for around $5, for brand new you're going to have to cough up a little more. The good news is that if you want to change out the crankset completely and go with something totally different (such as a triple ring, or something like that) you can just get virtually any Sakae or Shimano square taper crankset and it will fit on the square taper bottom bracket. If you want something like a 34, I would consider purchasing a complete triple crankset that has a low gear that you like (the bonus is that if the BCD of the outer two chainrings is the same as the BCD of the chainrings that you currently have, you can always keep your old ones as spares). You'll probably need to get a new derailleur that is triple-ring compatible as well, if you get a triple ring.
Another option is that if you can find another bike from this era of similar make that has gearing that you like, you can probably just switch out the cranksets and FD between them. I own several bikes from the late 80's timeframe and have switched out the cranksets between bikes without any problems.
Last edited by Jose Mandez; 02-01-11 at 03:03 AM.