I have the IRD crank that looks like the old campy style (same as the velo orange but less shiny, which is the reason I got the IRD model instead). Something trippy about this crank is that the middle ring is a triplelizer; the granny ring is mounted on it. Right now have a 118mm bottom bracket that lets me run it as a double, but things are a hair too close to add the granny ring.
So anyways, on my last internet order I got a bag of assorted crankset/BB spacers. I figure 2mm will let me clear the granny ring and give me the flexibility of running the crank as either a double or a triple, as the whim may strike. What I got doesn't make sense to me. I figure a BB spacer would fit between the driver side cup and the frame. I basically got a bag of assorted thickness washers that are 25mm outside diameter, 19.5mm inside diameter.
a. Out of curiosity, how the heck are these supposed to be used?
b. Does anybody sells a bag of assorted BB spacers, the ones that would fit between the frame and the driver side cup? I see bags of 10 for a given thickness but not a mixed set.