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In a word if you want spot on speedo measurements you stick with the stock tyre sizes. Although spot on speedo measurements can mean anything since there is about a 10% (if not more) error in the reading anyway!
Lets take the example of 185/55 15 and 195/50 15. What you want to do is work out the rolling diameter.
185/55: thickness of tyre = 185*0.55=101.75mm
multiply by 2 since there are two bits of tyre along the diameter = 203.5mm
then add the 15 inches for the alloy (convert inches to mm first!) = 203.5 +(15*25.4)=584mm
doing the same for195/50 gives 576mm which is slightly smaller but it is only 8mm! which is only 1.4%, specified limits lie within 4%???
In a way a slightly smaller rolling radius is good because you are going sssslllliigggghhhttyyyy slower than what your speedo reads! which is always good!
yeah i did some maths today and worked out id have about an extra 2inches of diameter, which i worked out would be ok! so the speedo dont change drastically thhen, thats good news!
I think im gonna get a set of team dynamic mirages on 15s with 195/45 rubber - dunno if you guys know this rim but someone told me the 5-spokes were old and "unfashionable" now!!! what do u guys reckon?
I read in a mag that a mate brought back from America that they give a tyre a rounder profile to give a more progressive characteristic by fitting tyres wider than the rim is meant to have.They had an evo 6 with the same tyres front and rear but narrower rear rims to give a more progressive tail out slide under power. I had some Eagle F1s put on and they couldnt get a seal with 185/55/15s so they used 195/50/15s instead. Seem okay but the car feels less neutral/understeers more than it used to. Could be paranoia though.
The rolling radius of standard 16v/Williams wheels are greater than non-wide arch original Clios.
Many Clio 16v owners like myself and Mat Brown have 195/50/15s on our cars. The 16v originally came with 185/55/15 profile tyres.
It doesnt matter about the speedo issue - by the time youre doing what you think is 60 on standard wheels, itll be more like 62-64. Speedos always over-read a bit. Hence why any car youve ever taken to top speed is a bit better than the book says!!!!
The 195/50/15 tyres will give a little more grip, a little less comfort, slightly better acceleration and minutely lower top speed. A winning package in my eyes!
cheers ben im goin to elite racing in essex on fri to investigate (no, prob will get some then, damn these moddin urges !)! do you have a pic of what the rubber looks like on your motor? sorry if this sounds really picky, just probably too interested in the whole alloy thing!
Yeah its pretty much been all said on here. In my experience, the wider you go (and lower profile), the less progressive your handling will be on the limit. A more balloon like tyre will keep gripping for longer and be more controllable but when it goes it really goes. A rubber band type tyre is the opposite, kind of all or nothing grip, snatchy you might say; once it slides thats it, its gone, but it seems the sliding is more controllable than on a balloon tyre. Just my impressions, I may be mistaken.
rick - yeah i would really like to see what they look like if u can get a pic on! wanna see how "snug" they look! Also, why dont you think they would look very good? are they wheels made for bigger sizes?
Nick - thatnks for your comments, v-.interesting; wil prob go for the 195/45/15s so as to get a decent compromise!
FINALLY: do you (rick, or anyone else!) reckon then that for smaller rims, in general they look better with designs that have more spokes? (team dyn. tornados) than, say, the team dyn. mirages (5-spoke)?
I had multispoke 15s on my old 1.2, then 5-spoke 16s. Although the 16s werent much bigger, they looked a LOT bigger than the 15s. So I find that in fact that multispoke wheels make wheels look smaller - simple designs with spkes that go right to the rim look bigger.
The reason I said those Koseis wouldnt look good in a smaller size is because the spokes stop so far from the outer edge of the rim. If youve got wheels (5 spokes, multispokes or whatever!) where the spokes go out to the rim then they will look bigger.
At the end of the day the choice of which wheel you buy should be made on what YOU perceive to look good and one that will suit your car.
Sorry about the big pic, I didnt want to reduce it too much. Mines lowered about 35-40mm, Im thinking about getting some -55mm springs after christmas.