Top Tube Size
Made in Taiwan.
Fourth Letter in the serial indicates year of production (2001 or 2002). X in the example above indicates production Month (E to L - May to Dec). RV in the serial number indicates model REVO.
Bikes made in Taiwan usually had an 8 month production and shipping timeline before they were sold in bike shops around the world. In May of any year, factories would usually switch production to making models for the following year.