The characteristics of this product have been studied by our expert mechanics who have shown so all applications. However, if you have any other doubt you can always contact us and we will be happy to help. Read below the applications for this article. Pinion Starting Z14 / APRILIA SR 55 R, 50 R FACTORY 2004-2009 applications: APRILIA SR R, R FACTORY 50 2004-2009 chassis number: