since the chainwheel is a 48 tooth, for those interested in gear inches, that gives the pompino the option of a 65 or a 72 gear, though there are a myriad of toothed options available throughout the industrialised world. the chainwheel is affixed to a truvativ chainset which in turn meets the steel frame via one of those shimano type bottom brackety things, where the axle (spindle?) is attached