Petrol rear shocks are extremely versatile. Both the Petrol and Petrol-R use coil springs with sealed hydraulic dampers; the Petrol-R adds an adjustable rebound. Both Petrol rear shocks are available in two sizes: 165mm eye to eye with a 38mm stroke or 190mm eye to eye with 51mm stroke. Petrol rear shocks offer unsurpassed quality and durability for all conditions.