30mm stroke increases the displacement of your engine - 2mm more stroke than stock. The diameter is the same as the one originally used on the G230RC. It reduces crankcase volume, increasing compression.
Be sure to check your squish rating after installing this crankshaft to avoid engine damage. You will probably need to use additional base gaskets to allow for adequate squish.
Fits Zenoah G260RC / G240RC / G270RC. Also fits Chung Yang / CY26RC / CY27RC / CY29RC engines.