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Isn't it all to do with inertia and momentum.. the further the maximum weight of the wheel (rim) is from the centre, the more work required to turn the wheel.. or something like that..
forgot to say.. rarerims offer more than what's on their website.. maybe able to get what you want in 16" ?
195/45/16 = 290.95mm rr
205/40/17 = 297.9mm rr
215/40/17 = 301.9mm rr
at worst you're gonna throw the speedo out 3mph when travelling at 70mph
Can you not just take it to a Renault garage (or someone who has the proper kit) and reset the error code on the ecu?
It shouldn't fail the MOT because of this.
mine decatted car failed on emissions, something about 2 or 3 times over the required limit (lots of numbers on the screen, but didn't mean much to me)
your speedo will be under reading, rolling radius 195/50/15 = 288mm as opposed to 195/45/15 = 278.25mm, so when speedo says 70 mph, you're really travelling at 67.63mph.
It'll lower the car a little bit, and you'll "feel" the road more...
I found more grip with the 205's, not noticed any tramlining with the wider tyres.. found different manufactures of tyres stating "205" are actually different in width, only by a little, but enought to rub...
Khumo 205's rubbed on the front arch liners, where now the Uniroyal 205's dont...:S