<P> As of 2014, the CRF - X series includes the CRF250X and the CRF450X . </P> <P> These bikes have electric start, but are still considered race bikes, albeit for off - road rather than motocross . Differences from the R models include lighting, electric start, suspension settings, engine and exhaust tuning for more low - end torque, larger fuel tanks, and a more rugged widespread ratio transmission . Robby Bell won the San Felipe 250 in 2006, 2007 and 2008 . </P> <P> CRF - L </P> <P> As of 2016, the CRF - L series includes the CRF250L and the CRF1000L Africa Twin . </P>

What does the r stand for in crf450r