This is probably a shot in the dark–but I have a set of Rotor Q rings, the outer is 130BCD (standard), 50 tooth. The inner is 36 tooth, 110 BCD (compact). These will fit on the compact version of SRM cranksets…or any others I don’t know about which use 2 different bolt patterns…
The outer ring was ‘ground down’ so that it could be installed. If you wish to install it in a different position, you’ll need to do more grinding. If you have a compact SRM, you’ll know why you need to do this…
I don’t know the mileage on these, but it appears to be very low–no more than 200?, so there’s plenty of life left.
$75.00 for both, plus $10.00 shipping.
I’ll split these up if there are no SRM compact owners out there, but I’d rather just get rid of them to one person. If you’re a compact SRM owner, and you like your chainrings in funny shapes, this could be your lucky day!