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Its not cost saving. One tyre per side is sufficient for the load that it will be on. Four tyres per axle X 2 axles will be overkill. Another aspect is that the more the axles the better is the weight distribution. So is the way the bumps are soaked up. Hence, the dead axle is a supplementary one. In the B9R the dead axle can be lifted up from the road if the load is less. This will reduce wear if the load is not much.

Are you sure the B9R has this feature?

Lifting the dead axle is (also) to improve the traction on the driven wheels when the bus is over wet or snowy roads and loses grip while starting from a halt. Seen it in action in a VanHool coach in Chicago

Though I have never seen this in action, during the initial days of the B9R, when KSRTC introduced this, it was mentioned in the information brochure and article. From the tech specs it was mentioned that the dead axle can be taken off the road if not needed to reduce wear of the tyres.

I have seen this in the EU. Assuming this is whenever the bus is driven with lesser load

Volvo GVW is 19T and so the single tyre is sufficient in the pusher axle. There is no option to lift the pusher axle, rather only to reduce the air pressure on the bellows, but they still will be in contact with road.

I have seen two switches on the dashboard for lifting the axle/wheels thigh never seen it in action.

Anurag

Third switch is for one we are speaking about.

Bang on. Never seen them raised and driven in the Volvo's.

Have seen it lifted and driven if no load is there in AL and Tata trucks.

Anurag.

Each tyre can carry 2750 kgs. A 4x2 tyre combination gives you capability to carry 16250 kgs and a 4x2x2 gives you capability to carry 22000 kgs, it's all permutations and combinations. The length of the chassis determines the nimbleness the vehicle would have in twists and turns

A normal ladder on frame chassis weighs 4000 kgs. A body builder like Sutlej will bolt on a 10000 kgs body onto your chassis, the Karur guys can get a 4000 kgs body bolted on. Now averaging 65 kgs per passenger, 35+1 will add on 2400 kgs and then any luggage you might want to carry. In its prime, doing a Mumbai-Bangalore run, a Sharma/National Sutlej would be 20000 kgs hurtling down the highway

It doesn't get lifted to such a height that you'd notice it. In AL/TML trucks the axle gets elevated to the height of the chassis itself, but in a Multi-axle bus, it "just" gets raised - just enough to avoid the tyre from having road contact.

It will not be raised. Just pressure is reduced and will still have contact in road.