VertexWinderosa - Forged Replica Piston Kit (24109B) K-Type-Chain Guides The crash bar is made

The crash bar is made of 25 mm in diameter and 2 mm thick round tubing

TR6 refers to the shape of the valve stem

kits for 1090/1190/1290/1050 are different because of the differences in the frames of those bikes

4” Because

VertexWinderosa - Forged Replica Piston Kit (24109B) K-Type-Chain Guides The crash bar is madeForged OE Replacement Piston Forged Replica pistons are forged OE replacements. Forged pistons are forged from 2618 aluminum for superior strength and durability. All piston skirts are coated with a high tech coating for faster break in time and increased piston life. All pistons are heat treated with a T 5 hardening and tempering cycle. Kits include piston, rings, wrist pin and circlips. Exact fit A, B, C or D pistons match your cylinder bore