Kyosho VZW427 Aluminum Upper Arm Stiffener V-One R4

Kyosho VZW427 is an aluminium upper arm stiffener for the V-One R4. It bolts across the upper arm mounts to tie them together, taking the flex out of an area that otherwise moves under cornering load.

The effect on the car is sharper turn-in and more consistent steering feel, because the upper arm geometry stays where you set it instead of deflecting as the chassis loads up. It also adds a measure of crash protection to the mounts themselves, which is worth having on a nitro touring car that spends its life close to the barriers.

Kyosho lists this as an option part for the V-One R4 rather than a kit-stock component, so it is a hop-up rather than a straight replacement. Fitment covers the V-One R4 family.

• Genuine Kyosho part number VZW427
• Aluminium upper arm stiffener
• Increases upper arm rigidity for sharper steering response
• Option part for the V-One R4