On eBay ,''A LOVELY RARE 1930s FRENCH CHANDEZE CHAINSET WHICH HAS BEEN REPLATED TO A GOOD STANDARD (THE CRANKS WERE NOS) . IT IS FITTED WITH A LIGHTLY USED 46t 1/8 CHAINWHEEL . THE CRANKS ARE COTTER LESS BUT I'M NOT SURE WHAT AXLE IT WOULD USE. " What good does the curve do????????? Charles Nighbor Walnut Creek, CA