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京商Ultima RB5最新推出了SP版本。RB5已经是相当成熟的车系，而京商工程师经过大量测试之后，做了进一步的改进和补强，使RB5成为09赛季一个不可忽视的选择。
Ultima RB5 SP New Features:
Long Rear Suspension Arms
The RB5 SP features rear suspension arms that are 2mm longer than the arms used on the original buggy, which are the same arms that are standard on rear of the Lazer ZX-5 FS. The longer arms, combined with other changes made to the rear suspension, give the SP better and more consistent traction through the corners and better bump handing, especially on high-bite tracks.
Rear Suspension Mounts and Transmission Housing
The lower rear suspension mounts on the chassis are revised to accommodate the longer suspension arms. The IFMAR legal maximum width is maintained by moving the suspension mounts 2mm towards the center of the chassis. The transmission housing is also modified to fit the new suspension mounts.
Low-Profile Rear Shock Tower
Reducing the height of the rear shock tower slightly lowers the center of gravity, which improves cornering ability, and by reducing the height of the shock tower in relation to the wing and wing mount, it offers addition protection against crash damage.
Velvet Coated Shocks
The already legendary Kyosho “Triple” shocks benefit from a smoother, more durable “Velvet” coating that promotes smooth, consistent shock movement. Threaded caps at both the top and bottom of the shock are included for easier maintenance and they allow the shocks to be built as an emulsion shock, or with optional volume-compensating bladders.
Hard Rod Ends
The rod ends feature a new, stronger material that is more durable and resists contamination from dirt. This means that the rod ends stay tighter and are less likely to be damaged or separate from the ball stud in the event of a hard crash.
Revised Rear Hubs
Factory drivers have determined that only one of the hinge pin holes was ever used in the original RB5 wheel hubs, so the extra hole was eliminated for the new SP Edition. Combined with a new, more durable material, these hubs are not only much stronger, they’re also lighter and the new geometry produces more stable handling characteristics.
Chrome-Moly Turnbuckle Linkage
Use of a stronger material means the new turnbuckles can be made lighter and stronger than the original steel turnbuckles. The new turnbuckles feature a 3mm square adjuster, which further reduces weight.
Orange Front Shock Springs
The kit now includes the popular orange front shock springs, which produce better suspension action over the bumps and more precise steering control in the corners.
“Sword” Body
Chiseled lines combine with smooth, flowing sections to create a body that is not only attractive and boldly styled, it also provides greater down-force in combination with a larger rear wing for increased traction and greater high-speed stability. | 
