Hi all,
im going to buy a set of team dynamics rims in black and wanted to ask wich sizes should be ok , as they can only supply me with 215/40 R17 will it fit? and is it ok or to small?
thanks

i got 215/40/17s on mine and its lowerd 35mm. There fine

thanks for the info Ben,
going to order the rims on monday .
set of team dynamics in black what do you think?

I've just created one of these calculaters on excel and I'm getting different numbers to the calculator sites?

The error is in calculating the rolling radius. I'm assuming it should be

Diameter/pi but it's giving a different answer? Anyone know why?


Sorry for the hi-jack

Ive those wheels good set Imho.

(Another Hijack) I was thinking of putting 19"rims on my coupe gaining 2" diameter.Can anybody tell me if i would gain more power.Put it anotherway,get up to 60/70mph with less revs/foot thus saving fuel!!
£106.9 at the Shell on the A49 just south of J28 M6 nr Layland i noticed on friday

I can tell you, NO! Your power won't change (unsurprisingly) but you will have less bhp @ wheels.

For a start, you wouldn't gain 2" diameter , the tyre profile would have to be smaller to match the original rolling radius. Use a website like this to find out exactly what tyre size you would need.

Even if the rolling radius is EXCATLY the same, your car will become slower unless the wheels actually wheel less than standard (unlikely).

Then there's the cost of the tyres. If you're looking to save money on fuel, then you definately don't want to be forking out the difference on 19" tyres (something like 2-3 times the price?)

this always used to come in handy for me when I had my bravo

http://www.fiatboo.co.uk/tyres.htm

I've got my own on excel

I find it even more accurate when you can factor in the cars natural speedo error

I hope you include for the depth of tyre tread and the tyre pressures?

My two pennies:

I've run rolling road radius's too small for cars in the past, and too large. (Actually doing this on the Bravo 1.2, currently).

I can tell you that on paper (or by excel/formula calculation) there may appear to be a lot of differences, but when it comes to actual driving on the wrong size wheels, those differences are barely noticeable.

Years ago, I ran an Uno Turbo, on lower than the correct profile rubber on 13's. Acceleration felt faster, but revs picked up a lot quicker. Fuel economy? Probably worse, but hardly noticeable. Handled well, because of the lower centre of gravity - but this could be equally achieved with shorter stiffer springs.

The Bravo 1.2 I have, is on the old Coupe alloys and tyres, making the rolling radius too big. In theory my speedo should under read. But because of the fair wack of over calibration Fiat dial into their standard speedos, it's actually now far more accurate. Driving the car feels about the same, maybe not quite so fast on acceleration, but on a 1.2 that's not going to be a big difference. Fuel economy? Still about the same, maybe on long motorway journeys at 60mph it's better. But that's not been calculated, and just a guess. That said, I'd have been there with the calculator if I'd noticed a massive loss or improvement in fuel economy. Because there's virtually no difference, I've not bothered checking this.

Certainly, there are issues with clearance if you run massive wheels on a small car. But 19's will clear the back arches on the Coupe, just watch the fronts, as it's limited with the inner plastic arch.

You'll also have to make sure the car is fairly lowered, as the 19's will jack the car up a little.

Thanks for the info lads,as for the cost of changing it was £0 as the wheels where on a L reg MX3 that nearly got scraped but didnt,and my TomTom says im doing 70 at 75 anyway