Schwalbe Rocket Ron ADDIX SpeedGrip 27.5 x 2.25" Trail Folding Bike Tyre - SGSchwalbe Rocket Ron ADDIX SpeedGrip 27. 5 x 2. 25" Trail Folding Bike Tyre SG The Rocket Ron combines speed and cornering stability at the highest level. The tread design offers a balanced ratio between stable lugs and sufficient gaps for excellent rolling characteristics and very good self cleaning. Tyre type: Folding tyre Used for: Cross Country, Race Size (inch): 27. 5 x 2. 25 Size (ETRTO): 57 584 Construction: Evolution Line, SnakeSkin, Super