You got a Cafe Racer or Custom Motorcycle that you are building but you're limited on space. Well Antigravity has the solution for you. Make no mistake about the size of this battery from Antigravity. The Antigravity 4-cell is extremly small but capable of very high power. It can start inline 4-cylinder Sport bikes up to 600cc, and is used in the AMA SX and MX Series in bikes up to 450cc. It is also the choice for builders of cafe bikes and customs up to 550cc . It is so small it can be tucked away almost anywhere.