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Rear End PDF  | Print |  E-mail
Written by Vic R   

Rear end adjustments include wheel hub length, track, rear ride height, axle stiffness, and seat struts. Changes to these settings are usually made when handling problems occur on the exit of the corner.

Wheel Hub Length

Several different wheel hub lengths are available from your dealer. It's highly recommended that you purchase three different hub sizes as they are the most commonly adjusted setting on the kart. The longer the hub the more rear end bite. Use the shortest hub if the kart feels tight at the exit of the corner and use the longest hub when the kart feels loose at the exit of the corner. Rear Track

Start with your track set to a width of 1385mm. It becomes necessary to narrow the track when the rear of the kart is tight at the exit of the corner and has too much rear end bite. However, this is an adjustment only made when you have first changed your wheel hub length to the shortest hub available and are still tight at the exit of the corner. Narrow the rear track in 10mm (1/2 inch) increments.

Rear Ride Height

On most chassis there are two setting for the rear ride height. The factory recommends running the chassis with a higher ride height for better grip. The higher ride height, like the front end, creates more leverage in which to transfer the cornering loads to the opposing tire and thus results in more grip. Lowering the rear ride height will have the opposite effect and cause the kart to be extremely loose. Only in extreme cases should you change the rear ride height.

Axle Stiffness

Axles are available in different stiffnesses. Generally, you will want to use a medium stiffness axle. Harder axles are used when the weather is cold, slippery track conditions, and when rules mandate the use of harder compound tires. You shouldn't' be afraid to run a harder axle but at the same time, changing the axle has a dramatic effect and should be used only when the rear end of the kart is uncontrollably loose at the exit of the corner.

Seat Struts

The seat struts allow the high leverage point of the driver to be used to transfer the load to the rear tires and thus create more rear-end bite. When seat struts are removed, the driver’s high position on the kart is not taken advantage of and minimal load is transferred to the rear tires. As a result, the kart becomes loose. The seat struts are therefore only removed when all else fails to loosen up the rear of the kart.