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Generally, it’s best to start at 54-3/4”, as this gives the ability to narrow or widen the rear for slightly
more or less grip if needed to balance the chassis. Each side is only 1/8” away from the maximum of
55”. It becomes necessary to narrow the track when the rear of the kart has too little grip. Keep the
operating range of movement on the rear width in a fairly small range.
Narrower: more grip, but less stable
Wider: more stable, but less grip
Axle Stiffness:
There are a wide variety of axle hardness available for CRG chassis. The axle has a very strong
influence on rear grip characteristics. In almost all cases, you will use a mid-range axle. The hard or
stiff axle is used when the weather is cold, in slippery track conditions or when rules mandate the use of
harder compound tires. The softer axle is used if conditions are extremely grippy or where excess
rubber has built up.
In general, higher horsepower karts need stiffer axles for more traction. Lower horsepower karts have
a greater need to “free” up the chassis and will run softer axles. Remember the spring frequency
“tuning” comparison. The softer the spring, the more/longer the inside rear wheel will stay up.
Tall drivers generally will need softer axles to help reduce grip.
Axle Offset and Length:
If you’ve moved the rear track to 55”, installed a soft axle and short hubs and still just need a little less
grip on one side of the kart (for a track with the longest turns in one direction). If you find yourself
wishing you could go to 55-1/4” on one side, you could try offsetting the rear axle to the other side of
the kart. If all the other measurements (rear track width and type of hubs) stayed the same, the side
with the shorter axle will have less leverage and therefore less grip.
Another way of accomplishing this for both sides is to install a shorter axle of the same hardness. In
this case, both sides will have less leverage. In either case, be sure the hub still has enough axle to
hold onto.
Rear Ride Height:
Most chassis have two settings for the rear ride height. The chassis should be run with the higher ride
height for better grip. The higher ride height creates more leverage, which gives more weight transfer
to the outside tires. The result of this is increased grip for the driver. Lowering the ride height will have
the opposite effect and cause the kart to have less rear grip and possibly oversteer. Only in cases
where there are very tacky track conditions should the ride height be decreased.
Remember that ride height is literally how high the kart is above the track. So raising ride height of the
rear of the kart will require placing the bearing carrier bolts in the lower bolt holes.
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