RFX Pro Series Trials Rear Sprocket Current Beta Gas Gas Montesa Sherco Underwear Riding RFX Factory Kit KTM EXC250 1SRS RFX Factory Kit KTM EXC250 14 19 EXC250 300 TPI 18 22 EXCF250 350 450 14 22 BPA and PVC free Beta Year Pitch Part Number Rev 3 125 200 00 08 520 FXRS 91 43 Rev 3 250 270 00 08 520 FXRS 91 41 Rev 3 4T 250 00 08 520 FXRS 91 42 Evo 2T 125 09 19 520 FXRS 91 43 Evo 2T 250 290 09 19 520 FXRS 91 41 Evo 4T 250 300 09 19 520 FXRS 91 42 Gas Gas Year Pitch Part Number TXT Trials 02 19 520 FXRS 91 42 Montesa Year Pitch Part Number 4RT 05 19 520 FXRS 91 42 Sherco Year Pitch Part Number 250 300 02 19 520 FXRS 91 42 Scorpa Year Pitch Part Number SY250 11 13 520 FXRS 91 42 RFX sprockets are colour coded for the make of bike and also available in standard silver for each model of bike