We can build custom T61 aluminum gears (top or bottom) for all Vmax-4's. These are for RACE application only, not trail riding, as top gears will see slight wear in a season of use. Complete gear sets (top and bottom gear) weigh only 1/2 pound. Will require your existing gears and chain for perfect fit! You can PM me for more details.
I have pictures of our gear sets, they are beautifully machined!
Thanks.