Originally Posted by TheRCF
One shop agrees with you (and I suspect you are both right), but a friend says he talked to another repairman who says it may not be necessary. Since this particular repairman is arguably the best around, that is worth noting. When I get a chance, I hope to take my bike for him to see for sure.
Well, some cranksets have different bolt circle diameters, but 130 happens to be the most common for road bikes. Lots of mountain bikes, for example, have 104 bolt circle diameter cranksets but most of them have triple chainrings. I have to agree, however, that measureing your crankset is the place to start. Sometimes 1 measurement is worth 1,000 guesses.