The rear swingarm is extended Five and a half inches. I bought the swing arm extensions from E bay. For the orange bike I needed room for the fuel pump. And. This would help. Now I have the pump mounted inside the body and I can lower the whole bike.
Plus the extension allows three inches of chain adjustment. That is 21 different gear choises with the same chain.
http://www.ebay.com/ulk/itm/390842259797
SWINGARM EXT BLK NINJA 250 A7050AB
The problem was they extend the swing arm about eight inches and the bike out of the modified class in Ohio. And just make it not fit in any other category for other originations. I can only extend the wheel base 10% of the factory documented wheelbase of 55.1 in. Or 5.51 inch extention.
I ended up removing about three inches of the original swingarm and mounting extention pieces. The way they adjust is nice also.