sloppy robot

ive got some of the old school ones lying around, the kinda campy style with the huge BCD, anyone knnow how small a chainring you can put on these? and while im at it.. whats that BCD? too lazy to measure

thanks

recneps

144bcd, and im sure the smallest chainring size you can find is 44t.

d_nast

i thought 151 but my bad, i think 151 was only campy and thought "huge bcd" means bigger than 144

Momentum

Dura Ace track cranks before about 1983 have a 151 bcd. These are the cranks that look like the fluted campy record from the same period. I'm not sure what the smallest ring is that will fit, the main problem I have found is finding any rings in that pattern under 50 teeth. I have seen a couple of 49s but not that many.

bikeskatethrash

44 is the smallest ive seen. i actually just sold a 46t and 47t ring on the bay.

I do have a 45 lyin around though.

xthugmurderx

they're 151 and you can get a 43. if you want, i have a 43 tooth 151 bcd chainring...and a 45 and a 50 and a 55..hahhahaha. i win. but yeah, if you're interested in any of them, hit me up, though i'm using the 45 on some sugino mightys (not onlly campy made 151)

-jason

11.4

You have 151 BCD with that crankset. If you want to prove it to yourself, go to www.businesscycles.com and go to their technical reference section; he supplies center-to-center measurements (and how to measure them) for each of the drillings.

You can fit down to a 42 on a 151 BCD, but at that point the inside sideplates of your chain are riding on the crankarm spider itself. If you're riding 1/8", you won't quite get that far and like the result. Aftermarket went down to 43 and occasionally 42, but the crankarm manufacturers didn't go lower in real track chainrings than 44, and later 46.

coelcanth

it's too bad you weren't at the ttown swap meet cause there was a guy there that had a buttload (a buttload here = about thirty) sugino mighty comp 1/8" rings in 151 bcd @ $20 each

i didn't get his contact info but maybe someone else on here did ?