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[Liam]

I would have thought it'd have less to do with slip, which should surely stay pretty much the same, and more to do with the fact that the extra sidewall flex of the higher profile tyre would significantly reduce the laden rolling radius, wheras the 18" with low profile tyre would stay much closer to it's calculated unladen rolling radius.

[2woody]

there'll be an element of both, but the slip is my favourite

[feeutfo]

seat of the pants, so not rearlly relevant, but i have 245 40 18 (8j ET38 if that helps)with sc3's on the rear which have just replaced linglongs of the same size, thank god.

The ride is noticeably more compliant as you would expect, but the point is i would swear the gearing feels a little less tall than with the linlongs which did feel taller or higher than stock, which the previous figures would prove.

Wish i had meaured the rear ride hight now as the sc3's seem to sit lower for the same size, or done those sat nav measurments woody spoke to me about via pm... or i've imagined it, which is indeed entirely possible.

[2woody]

it's possible.

tyres can differ forom make to make, especially in their sidewall construction, and to add tio the argument, the geometry of the sidewall can fool you into thinking it sits differently (optical illusion).

furthermore, different manufacturer's tyres of the same nominal size will have different wrpm.

the cheaper tyres will doubtless have softer rubber, that's how they get the grip without the technology