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Yes, somehow (archive)

[ Follow Ups ] [ 5-series (E34) Message Board ] [ Msg. Board FAQ ]

Posted by Dragos on August 28, 2001 at 01:31:34:

In Reply to: does rim/tire size affect abs posted by johnC on August 28, 2001 at 00:47:04:

Braking is dictated by the size (and shape) of the contact patch. It's also dictated (first and foremost) by the coefficient of friction between the tire compound and the road surface.

So assuming the new tires have a comparable compound with the older ones (besides being newer), the diff comes from the contact patch.

On taller tires (smaller rim size), it looks like
| |
| |

On + sized tires, it looks like
| |

meaning wider and shorter, ie greater contact surface for your braking pleasure.

Plus sizing improves braking performance and you may experience heavier braking before you will lose adherence. ABS is triggered only by relative number of revolutions - if the wheel doesn't spin and the car is not stopped, it must therefore slip.

just saw now you didn't do plus sizing, but the above stays true.

i got some new tires that are wider but a little smaller in diameter and i notice now when i brake hard they screech alot. i havent really had a chance to see if i am totally lock in up the brakes. anyone know whats wrong. the tires are BFG comp TA's maybe its just the tires, they do grip a whole lot better than my old ones did too.

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