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You should remain within a 10-15mm variation from your kart manufactures recommendations.
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If you find you are not sliding, and your kart is hopping, increase track width by 2.5mm each side. The inside wheel should be lifting through to the apex of the corner. The inside wheel needs to lift during cornering for a kart to turn so, if during your test sessions you find your kart is sliding in the rear, reduce the rear track width by 2.5mm each side until your kart is no longer sliding. Finding what works best with you and your kart is a matter of adjusting & testing.Ī good starting point is to use a medium axle at most tracks with a rear track at the recommended width. Using toe out to gain more steer therefore would only be a last option, generally not using any more then 2mm.Īxle choice can sometimes mean losing seconds on the track. The more toe out you have the more initial bite into the turn you will have but this will sacrifice straight line speed. Toe is the amount that the wheels point in or out. Ideal steering can then be obtained by adjusting the castor settings to the particular conditions on the day. My recommendation is to adjust the scrub radius to your kart manufacturers’ recommendations & then reduce it until your kart begins to understeer. Adjust the front wheels out to gain more scrub radius (& thus more jacking effect on the rear wheels) and in to reduce scrub radius (less jacking effect). Scrub radius is the distance from the kingpin to the inside of the wheel. Here’s a tip: if you are finding your kart is twitchy when turning in, reduce your Ackerman: Connect the tie rods on the outside holes on the stub. At larger meetings, when grip levels are higher, adjust 0mm to 2mm positive camber. Here’s a tip: On club days, when the grip on the track is low, adjust 2mm to 4mm positive camber. Increased Ackerman adjustment increases responsiveness & the reverse is true. This helps with the jacking effect on the rear inside wheel. AdjustĪckerman steering is when the inside font wheel turns more than the outside wheel.
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The following paragraphs define these terms & relate them to the overall set up & effect on performance of the kart. Axle choice, tire pressure and rear wheel hub sizes play their part, but 90% of this is possible through front end setup.įront end set up consists of adjusting the castor, camber, Ackerman, scrub radius & toe of the front wheels. For a kart to turn, it must lift its inside rear wheel. The ability of a Kart to turn is significantly affected by the set-up of the front wheels.