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DESCRIPTION All EVP.MOde Spec TAPP primaries are calibrated with +2mm rollers. Bigger rollers make the low end quicker RPM's, shift out quicker, and lower the full-shift RPM. This is due to arm angle and roller weight differences. +1mm Rollers - Outside Diameter 16.5 mm; weight 12.5 grams each. +2mm Rollers - Outside Diameter 17.5 mm; weight 15.3 grams each. +3mm Rollers - Outside Diameter 18.5 mm; weight of 18.5 +3.5mm Rollers - Outside Diameter 19mm; weight of 19.7 IMPORTANT - Roller size must be installed in pairs opposite each other. Failure to do so can imbalance the clutch and may cause failure. Manufactured by Evolution Powersports. Official specs and resources: EvoPowersports.com. Product Disclaimers | Installation Instructions | Terms and Conditions
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🇺🇸 Ship from USA · On Agora since 2026
$125.00