Swingarm Kit - Extended 3" over stock. This kit includes a high quality lightweight all aluminum swingarm that increases strength and improves handling. Unlike many other swing arms on the market, the pivots on these use bearings instead of the stock type rubber bushings. Recommended for use with 330mm long rear shocks. We have two types of 330mm rear shocks sets available in this section that work great with this swingarm. Important Note: The swingarm itself is a bolt on kit, however, a roller (not included) is recommend - there is a perfect spot on the Z50 frames to bolt or weld on a roller. If you want to see a picture of this kit mounted, please email us at hondatb@aol.com This is the swingarm we use on our vintage mini mx race bike Z50s.