Chainrings are fitted to the crank arms and come in single, double or triple configuration. Most geared bikes use a 3/32 inch width, whereas 1/8 inch is the popular choice for track bikes and some single speeds due to its increased strength which is needed when riding a fixed wheel. Chainrings are available in a number of formats, these are known as PCD's (Pitch Circle Diameter) or BCD's (Bolt Circle Diameter), this is the spacing of the bolts that secure the rings to the crank arms. Common sizes are 74mm inner ring Shimano MTB, 110mm middle and outer for Shimano MTB, 110mm for most compact chainsets to allow for the smaller ring combo's, 130mm for Standard Shimano Road and 135mm for Standard Campagnolo road chainsets.
About the TA brand
Specialites T.A. is a very well known, time-honored French company. It has consistently upgraded its wide product range which includes water bottles, bottle cages, chainsets, chainrings, cranks and bottom brackets. TA rings, made from the best 7075 alloy, are cut on a lathe for perfect chain mesh, heat treated for extra long life and lazer engraved for future reference. There is a wide range of ring sizes for virtually every popular pattern of chainset. The clever Vega and Carmina chainset build system with a wide range of crank lengths underlines the specialist nature of TA.