Standard (Double)- A standard crankset has a one hundred thirty millimeter bolt circle diameter (or BCD, Campagnolo cranks have a one hundred thirty five millimeter BCD). Almost always, the chainrings on standard cranks are 53 teeth and 39 teeth. Today it is still the choice for most cyclists, unless you will be tackling the steepest and longest of climbs consistently in your rides. Compact – Compact cranksets allow a wider range of gearing options with their 110 millimeter BCD. Most often they will come with a 50 and 34 tooth pair of chainrings, but increasingly you will find 52 tooth and 36 tooth pairings. The former is a great all-around combination, especially if you are tackling significant climbs. The latter gives an easier gear for climbing and still has a big enough chainring to not lose very much top-end speed when compared to a standard crankset on the downhills and flat. Triple – Until compact cranksets came out, triples were the only way to get a bike dedicated to climbing. The third chainring mak