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Bearings are not affected by the diamater of wheels but are affected by the offset of wheels.

The increased diamater still places the stress in the same plane because the tyres that you use are lower profile so the tread area is in the same place as the original smaller diamater wheels.

Wheel offset is a different matter as the wheel can go either further in of further out depending on offset and this then places more stress on either the inner or outer wheel bearing. If you go for larger width wheels and can retain the same offset as your original wheels (or close to it) then again there is no increase in bearing load. This situation offen happend with Silvias when you put on a wide bidy kit with wide wheels that just go out to fill up the wider guards - this places additional stress on the wheel bearings.

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Bearings are not affected by the diamater of wheels but are affected by the offset of wheels.

The increased diamater still places the stress in the same plane because the tyres that you use are lower profile so the tread area is in the same place as the original smaller diamater wheels.

Wheel offset is a different matter as the wheel can go either further in of further out depending on offset and this then places more stress on either the inner or outer wheel bearing. If you go for larger width wheels and can retain the same offset as your original wheels (or close to it) then again there is no increase in bearing load. This situation offen happend with Silvias when you put on a wide bidy kit with wide wheels that just go out to fill up the wider guards - this places additional stress on the wheel bearings.

I Agree, the wheel diameter has nothing to do with it. And the offset could have something to do with it.

And By the way I have an R34, it's 10 years old and it always had 17" wheels on it, I've owned this GREAT car for nearly 3 years now and Never had any problems with any tyres, bearings, discs and that kinda stuff.

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