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This is the product listing for the Js Racing Adjustable Rear Upper Arms manufactured by Js Racing.
Part Number PRA-D2.
One of the most important components in any race or lowered cars suspension is the upper rear control arm, which allows for adjustment of up to 5 degrees of camber correction. The ability to dial in and out camber at will is important to teams who need to set up their cars for optimal performance. The less camber, the more tyre contact, but the greater the friction. The more camber, the less tyre contact, the less the friction. However with more camber inner wall tyre wear is much greater - which is desireable for race cars (as when a car leans into a corner the tyre contact surface increases under load) but no so desireable for street cars. As you can see, in any application the J's Rear upper arm is the perfect part for correcting camber. J's Racing uses high strength materials (2017S Aluminum) for their upper arms, and although slightly heavier than other Asian options, they are stronger - perfect for track work.
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