If both rear tires are planted on the ground and you try to turn, the inner tire will spin across the ground too fast and it will push the inside of the kart in a straight line. But what about the back wheels? They are stuck together by the solid rear axle and must spin at exactly the same rate. On a kart, this is easily done by the front wheels because they are independent and free spinning. The tighter the turn, the bigger the difference in the wheel speeds. Because of this, the inner tires travel less distance, and therefore they need to spin slower than the outer tires. The outer ones go through a larger arc than the inner ones. If you do the same adjustment to the left rear and right front and the opposite adjustment to the left front and right rear, your cross weight should change without ride heights changing.When both cars and karts negotiate a turn, the outer and inner wheels go through different arcs. When adjusting cross weight, it is important to use the X method. Once you have the desired numbers, it is a good idea to recheck your ride heights to see if they changed before setting your cross weight.Įveryone’s optimal cross weight will vary, but a good place to start is 54% measured without the driver in the car. Move your ballast around in the car until you achieve the desired percentages. While the ideal percentages will vary, we recommend starting out with 57% left side and 57% rear. Moving ballast is the only way to achieve the desired percentage of left and rear. When scaling your car, it is important to remember that left side and rear percentages will not change by turning on the adjusting shock collars. The final step in setting up your RSR car is scaling it out, without the driver in the car. For example, a 1.5” would measure 2.25” at the cross tube. You can measure this at the front and rear cross tubes by simply adding. We recommend a starting point of 1.5” ride heights without the driver to start out. It is important to have a baseline setup to come back to if you have made adjustments to your RSR car and seem to have lost the handle. Set tire pressures at 11 PSI in the right front and right rear. Now that your RSR car is all squared up and has tires on it, you are ready to set ride heights and set it on the scale pads.
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March 2023
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