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What are the negatives of going for a wider tyre on the yaris? The contact patch will be wider but thinner. This means more turning grip but thinner in the direction the car is moving meaning less grip to accelerate and brake? Small margins either way
 
What are the negatives of going for a wider tyre on the yaris? The contact patch will be wider but thinner. This means more turning grip but thinner in the direction the car is moving meaning less grip to accelerate and brake? Small margins either way
That is correct in theory with everything remaining equal (which it won't be as you can't get 4s in wider than 225 in 18) but in reality just more grippy everywhere when the conditions are ok.

Negatives are noise for sure. Cost. Have to adjust geometry really.
 
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