Ever asked yourself why do some trucks have dual rear wheels?
The technical term is “dual rear wheel”, called dually or DRW for short, and it all comes down to increase safety and stability.
Let us discuss the reasons behind it:
Dual tires are used on the non-steering axles of heavy-duty commercial trucks to increase their load capacity and help maintain vehicle drivability in the event of a flat rear tire.
Placing two tires on both ends of a single axle nearly doubles the weight that the axle can carry and allows three properly inflated tires to temporarily carry the weight originally allocated to the four tires if a rear tire loses pressure or goes flat.
The power of the engine goes to the rear wheels.
Having extra traction in the back by having extra tyres back there will help it to maintain stability.
Putting dual tires on a steering axle will result in increased grip with the road that would greatly increase the effort required to turn the wheels, and would result in a high rate of tire wear.
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