i posted this in the vintage forum, but i thought i would give it a shot here:

I am in the middle of rebuilding an old 79 Raleigh Mixte frame for my girlfriend.
It has a cottered crankset, with 3-bolt type spider and chainring. The BCD i believe is 106....basically 101mm from bolt to bolt.

Now, The two chainrings it came with are a 40 tooth and 49 tooth (or was it 50? anyway)
I am converting the back hub to a simple coaster brake (ease of use for her, she is used to it and likes it)....

ANYWAY, to my questions:
i really would like to find a 3 bolt chainring with anywhere between 42 to 44 teeth, most preferential is 43. I have found some on ebay, mostly from one seller, but they arn't super cheap and the seller has basically ignored the 3 emails ive asked about the BCD of the chainrings. I dont feel like buying and hoping they will fit.

ok, questions:
1) does anyone know about typical BCDs for 3 bolt cranksets? IE....were there a ton of varying BCDs, or just a few common ones....on ebay i saw an 85mm BCD chainring, and i think mine is 106 (or at least going by sheldon brown's calculation, 101mm x 1.1155)

i ask because this one chainring this non-communicative seller has LOOKS like the correct size, but if i hear from someone here "oh yah theres basically only 2 main 3 bolt chainring BCDs" then i might pull the trigger....

2) does anyone know of some online store or something that i just cant find thru google searching that would have a selection of 3 bolt chainrings?


ANY help is GREATLY APPRECIATED!!!
thanks!
dan