RSV4

The pin sizes are listed because of inconsistencies by Aprilia on the steering tube across the range of RSV4 models. Exact pin specs are proprietary information, but use the #31 pin if your steering stem hole is roughly 19-20mm(on up to the '20 model year). Use the #47 pin on 20mm holes(on the '21+ models). Use #25 if it is roughly 16mm. Use #15A if it is roughly 27mm. If you are not sure, give us a call at 256-533-1977.