The new Ultima RB5 Upgrade Kit comes with updated parts that the Kyosho factory team drivers have been testing with great success! Included with this kit are:

Short Rear Shock Stay - Shortened and lowered angle allows MUCH more rear grip and decreased roll
Middle Suspension Arm - 2mm longer rear lower suspension arm allows more reliable and stable turns
Heavy Duty Material - Material made from more durable resin to increasing the cars durability even more
Newly Designed Rear Spring - Slightly stiffer springs allow quicker response
New Rear Hubs - Offset hubs that are both stronger and provide increased rear traction

Part #: UMW510