Trucking Efficiency has found that North American tractor-trailer ﬂeets can accrue multiple beneﬁts from adopting 6x2 axle systems, and moving away from the much more widely used tandem 6x4s.
6x2 axles offer a number of beneﬁts: they lower fuel consumption, vehicle weight, and maintenance expenses and, in some cases, improve stability. Adverse consequences include less traction due to only one drive axle and increased tire wear. The short-term concerns—higher upfront purchase cost and lower resale value—are expected to be mitigated over the next few years as buyers become more conﬁdent and scale is increased by higher demand. This will be especially true since 6x2 production is expected to double each year for the next three years.
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