I purchased it and tried to install it, but it does not fit the ApriliaRX125 2020MODEL. It is probably a Sprocket for the ApriliaRX125 2STEngineSpec. that was there in the past. It won't work on the current ApriliaRX125 4ST, so be careful!
Perhaps other Sprockets are different?
Looks like you access from European region.
Would you shop at webike.eu.com?
