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Discussion Starter #1
Has anyone fitted any different profiles to the standard rims other than 245/45R17 ? In particular 255/40 or 265/40 and do they alter the handling significantly ?
 

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Devils disciple
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I've got 255/40's not standard wheels but handling is improved in my opinion over the standard wheels.
 

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Mmmmm KPG-C10
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Profs

245/45/17 = 25.68" Dia
255/40/17 = 25.03 Dia

Some website says that +/- 2.5% is acceptable.

Obviously the wider the tyre, the lower the prof. to keep the overall Dia the same.

Take a 235/40/17 Tyre, change the width to 255/40/17 and the overall Dia increases by 0.63"

Try this link - http://www.tyresave.co.uk/tyresize.html

Did see a site somewhere that told you how much more or less your speed will be at 60mph, which is usefull!

Hope this helps!
 

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Take a 235/40/17 Tyre, change the width to 255/40/17 and the overall Dia increases by 0.63"
Maybe I is being a bit slow here, but I cant see how the above example shows that increasing the width increases the Diameter.

Not trying to be argumentitive, I just cant work out if its wider why it then becomes bigger Dia.
 

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I am lost here, if you have a 17 inch tube and cut it eight inches long or ten inches long its still 17 inch tube innit ?
 

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The profile i.e 40, 50, 60 etc is relative to the width so if you had a 195/40 and a 275/40 next to each other the latter would be taller, but in effect they would look in proportion to each other, a bit like a scaled up version

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is not 40mm it is 40% of the width
Got it now thank you for that.
Why do rubber makers have to go at odds to normal engineering principals ? Perhaps it has something to do with the condom industry. :D
 

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ahapartridge said:
I can see a poll coming next to see what profile nodders everyone uses!
Indeed....also - slicks, intermediates or full wets
 

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And there goes another thread down the slippery ;) :D slope
Better pull out of this one just in time....before it all gets too messy
 

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Just didn't want to get into another sticky situation big B ;) :D
 
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