Originally Posted by
JohnDThompson
There are 41T rings for 144mm BCD from Campagnolo, TA, and Ofmega (possibly others as well), but the difference in gearing from a 42T ring is minimal (and may require some modification of the spider arms to provide chain clearance) and probably not worth the bother of trying to find the 41T ring.
[MENTION=172094]Chombi[/MENTION] too...
I have a few of them, TA and Campy even a NIB/NOS Campy NR 41T chainring. It's only a 1" reduction in gear ratio with a 28T rear sprocket, even less with a 32T sprocket!
I may have one on a bike but the rest are part of my collection of rare junk. It's not worth the time to change rings for 1" or less lower gear!
As far as modifying the crank arm, I run 38T small chainrings on most of my 130 BCD cranks. On some of them that were made for a 39T minimum, I've had to file a little off of the crank to prevent the chain from rubbing.
verktyg
Chas.