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chainring size for Bianchi Pista?(10 posts)

chainring size for Bianchi Pista?Dog
Nov 14, 2001 7:03 AM
The Bianchi Pista came with a 48 tooth chainring - much too large for winter spinning.

Problem is, it seems to be some weird size, with a bolt circle somewhere around 102 mm. Anyone know what size to use? Can't figure it out from the Harris Cyclery/Sheldon Brown site, either.

Bonus points for knowing where to buy replacements. My LBS can't/hasn't figured it out.


well, what kind of crank?Jack S
Nov 14, 2001 7:51 AM
Any good LBS ought to be able to measure and figure out the BCD, then order from Quality. Real track cranks are typically 144B- trackies don't use small rings. You could always get a cheap crank compatible with the BB. Ol' Sheldon has a bunch and this could very well be the cheapest route. If you just want the ring you might also try track shops like Business Cycles, Bill Ron, Spicer, etc. Double check the chain pitch before buying.
another option . .jacques
Nov 14, 2001 8:12 AM
. . is to buy a larger cog, like a 20. Sheldon B. has them.
I think that's itDog
Nov 14, 2001 9:32 AM
I think you're right. You get much change from the cogs. Thanks.

might need a new chain - nmJack S
Nov 14, 2001 9:53 AM
yes, and Sheldon Brown says...Dog
Nov 14, 2001 10:47 AM
Sheldon answered my email - it's a 110 mm ring. Weird.

Didn't think about the chain issue. I'll need to see how much space is available in the fork ends.


110 is easy to findJack S
Nov 14, 2001 10:55 AM
and cheap... $10-20 at Loose Screws
Geez, DougRusty McNasty
Nov 15, 2001 7:58 AM
110 is probably the most common ring size for touring bikes. Even my crappy neighborhood bike-boutique has dozens of 110 mm BCD rings in the back. I'm sure Sheldon has so many that he plays frisbee with them (ouch!!).
Nov 15, 2001 9:23 AM
Once I found out it was a 110 (not 102, as I had measured), it became obvious. Also a BMX size, I understand. Got one for $10 at the LBS (which had been insisting I had a 130 size). Thanks.

my Bianchi Pista's running a 48 x 20 now, and . . .jacques
Nov 14, 2001 12:17 PM
. . . at the other end of the dropout ( but still with plenty of metal left), it'll take a 48 x 16 without touching the chain.