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Old 05-06-2013, 07:00 AM
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Liverman Liverman is offline
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Location: Teller County, Colorado
Join Date: Jun 2005
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Mein Auto: '14 X3 35i / '03 F350
Originally Posted by ASG View Post
Any concerns for my tires having a load rating of 98 instead of 102? The Michelin MXM4s are 98, but 102 is recommended. A load rating of 1,653lbs vs. 1,874lbs (per tire) / 6,612lbs vs. 7,496lbs (per four tires) doesn't seem like a big deal to me as I can't imagine even coming close to loading the X3 that much. The Michelin MXM4 is also off-program (not BMW tested) but that also doesn't seem to be a big deal and shouldn't impact the warranty. And, any thoughts on going to a 255/45-19? I'm fine increasing the width but I don't want to mess with the height of the tire, even if it's just 1/4". That's assuming it fits ok (it was Discount Tire's recommendation).
It just came back to me when I was checking the inflation in my tires yesterday.

The load rating on the tire is at the maximum inflation as stated on the tire. If you inflate to less than that maximum, then the load rating is proportionally less.

Tire Rack has several very good technical articles on load rating, speed rating and inflation pressure. Here is one:

You may want to dicuss this over at the Tire Forum, too. Folks there can also comment on the diameter change.

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