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get a grip

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lambert:
this is why god invented the sledge hammer and angle grinder :twisted:

clbarclay:

--- Quote from: "Guardian." ---THE WEIGHT IS SPREADOVER A GREATER WIDTH, IN THEORY MAKING YOU LIGHTER, SO YOU CANNOT STOP!
--- End quote ---


Errm confusing issues, if it made you lighter weight them it would also reduce momentum which improve breaking.

lambert:
i see the point about reducing ground pressure.

but would not that only apply if the tread pattern stayed the same (same rubber to air ratio per unit squared)?

if you go with a wider tyre but with an enlarged tread pattern (more air less rubber per unit square) would the net effect not be to retain the same or broadly simmilar ground pressure on a hard road surface?

not talking about off road ground pressure as i know it will be and i want it to be reduced so as not to overly damage the grass.

clbarclay:
One notable trouble with the more extreme off road tyres on the road is the height of the tread blocks. For on raod performance in the dry these should be as low as possible.


For off road situations (on soil/mud/sand etc.) pressure is not the most important part of traction, there are nominal limits depending on the exact terrain and what your trying to achive, but for example 500hp tractors can efficiently transmit all the power to the ground through tracks with a ground pressure of just 5 psi.

Range Rover Blues:
Simple Physics would tell you that it doesn't matter how much rubber is in contact with the floor, it's simply a matter of the weight and the coefficient of friction.

Ever seen a F1 car, why do you think the tyres are so wide? The more rubber you have on the floor the mare grip you get, it's a chemical attraction between the rubber and the tarmac refered to as 'stiction'

The ocasions when a narrow tyre help are to dig through snow/mud/slush etc to the grippy surface underneath, so not a factor of it's thinnes directly but the lack of floating on boggy/snowy surfaces.

You need to choose tyres to suite what you do.  As your car is probably not as heavy as mine I'd think 235 should be more than sufficient most of the time.

For sandy surfaces go as wide as you can, for muddy tracks go thinnner, same with snow.

One diassadvantage of wider tyres is that they ride up at the sides if you drive obstacles so they need to be flexible.  And yes they will drink more fuel.

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