Have thought of going to 235's but would I need to drop to 40 profile to keep speedo accurate or not enough of a difference to matter.

Arn't the RE001 spose to be pretty hard core or am I thinking of the wrong ones.

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Stoner & Webber 2011 World Champions

RE001's are a very good performance tyre. I run them as my dailys.

Why would increasing the width of a tyre affect speedo?

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[COLOR="Gray"]550Nm off a 2L... Just wish it was in the dak dak...[/COLOR]

Its only the roll diameter that effects the speedo. It thinks a 17" rim is turning when infact its a 18/19/20 or whatever. Number of rotations is then decreased over time and you are actually going slower then you think from memory!

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You're confusing the Re001 with the RE01R (this is the same type of tyre as the RE070.

A 235/45 will have a slightly larger overall rolling dia but the difference is SFA.

Are they reasonably quiet with a more comfortable ride???

Cos the aspect ratio changes the diameter as you change the width. ie with a 50 aspect ratio a 20mm increase in width should increase the radius by 10mm. Not sure how much difference it makes to speed ( to long ago to remember the maths ) but won't be identical to before.

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Sorry, should have clarified that increasing width by 10mm will do bugger all to speedo changes. I was trying to be rhetorical but failed miserably!

Can't comment personally on noise / comfort as those 2 words don't go with my car.

A friend runs them as his dailys on a stock 07 WRX. Slightly harder ride, quieter, more predictable.

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[COLOR="Gray"]550Nm off a 2L... Just wish it was in the dak dak...[/COLOR]

Yea sorry shouldn't have wasted that post asking. I'm sure you have driven it occasionally without bouncing off the rev limiter but certainly not the couple of times I cave seen it

Makes hearing road noise a bit of a secondary concern.

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Stoner & Webber 2011 World Champions