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Wheelbase on heavy 3 axle trucks is measured from the center of the steer axle (1st axle) to the trunnion, or the midpoint BETWEEN the 2 drive axles (axles 2 and 3), not to the center of the rear drive axle (axle 3). Axle to axle is only used on 2 axle trucks. Note: be careful using wheelbase to calculate bridge laws, which can use 1st axle to 3rd axle measurements in its calculation depending on the state/province.

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7y ago
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14y ago

Centre of the steer axle hub to the centre of the rear drive axle hub.

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Q: How do you measure the wheelbase for a semi truck?
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