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Tyre question...

Jimny33

Accelerating Away
Why do AT tyres put up fuel consumption when road tyres have more grip/friction on the road? I thought AT tyres have less grip on the road and therefore less drag....where has my physics gone wrong??? :eek:

Thanks

James :)
 
Thats a good question mate.. I guess its something to do with rolling resistance, but how im not sure. Interesting topic!
 
ATs will have a larger "square" area on each section of the rubber unlike the road tyres that are round all the way.

The best way to describe this is look at a Mud Tyre, you will see the blocks are very box shaped. ATs are like this just a lot less aggressive.

From this the rolling resistance is increased.
 
the deformation caused to AT's bloky tread patern increases the rolling risistance so you lose energy there AT tyers also warm up more on the tarmac due to the tread deformation so you lose even more energy there. if you look at AT's in profile youll note that they are very Sq. cornered compared to the road tyer the resilt can sometimes be an increase of over 20% in the tyers foot print. fine for more grip of road but not so good for fuel efficency as the biger foot print also increses rolling risistance and to add insult to injury AT's usualy run at a lower presure than road tyers making even more rolling resistance. but dont worry they help when theres snow on the road and you can still get home while everyon else is trying to get out of the carpark
 
Also, road tyres = Quiet, ATs = Fairly Quiet, MTs = Noisey.

That sound energy is generated partly because of the air rushing through the tread, so wind resistance is higher the lumpier the tread is.
 
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