hi i have just got sum mondeo alloys i think they are 17`s but can i use a smaller tyre for example 195/ 50 r15 opposed to the mondeo wheel 205/50 87v no idea what this means lol btw they are mondeo st 24 alloys






cheers paul

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What tytes does your fez run on fella??

Aim should be to match the rolling radius

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Some people are like slinkies. Not really good for anything, but bring a smile to your face when pushed down the stairs!

From the moment I picked up your book until I laid it down, I was convulsed with laughter. Some day I intend reading it.

195/ 50 r15 cheers fella

paul

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think standard ST24 alloys are 16" not 17" if so as you currently running 195/50/15's could possibly get away with either 195/45/16 tyres. but if they are 17", TOYO also do 195/40/17's which is about the same rolling radius. but either way would expect you would have clearance problems especially if lowered too!.

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Will

Right mate.
First thing to do is work out your existing rolling radius....

15" rims

so 15 x 2.54166 = 38.125cm.

Tyre aspect = 50mm. top and bottom wall, so thats 100mm or 10cm

So rolling radius is 48.125cm

17" rims.....17 x 2.54166 = 43.20833

standard 48.125 minus your new wheels 43.20833 means you have 4.9166cm to play with regarding tyre aspect.

2 walls so divide your 4.9166 by 2 gives you 2.45833cm......near enough 25mm


So to run 17" wheels without cocking up your speedo, affecting your turning circle, causing scrubbing you should be looking at running something like 205/25/17, maybe 215/25/17 dependent on your rim width.


IMVHO 16's are a far better comprimise for the road

_________________

Some people are like slinkies. Not really good for anything, but bring a smile to your face when pushed down the stairs!

From the moment I picked up your book until I laid it down, I was convulsed with laughter. Some day I intend reading it.

_________________

Some people are like slinkies. Not really good for anything, but bring a smile to your face when pushed down the stairs!

From the moment I picked up your book until I laid it down, I was convulsed with laughter. Some day I intend reading it.

thats a lot of maths for this time of night! i just looked at this for the easy answer

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Will

For ease I would go 195 40 R16

If you are lowered, or plan to go lower, using 205's can turn out to be fun.

Then again depends on the ofset and the width of the wheel.. but most seem to think 16's on a fiesta should be run with 195's, so thats why i went ahead and fitted 205's

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Daily isn't so Special. And it makes me sad.
Need space and time and I'll crack on with Jams si!

Catch me on Facebook as I'm rarely on here.

so basically if i fit 195/40/16 then i shud be able to get awasy with using these alooys obviously with the use of spacers but how many spacers and what mm and can i still lower it lol

cheers paul

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Some people are like slinkies. Not really good for anything, but bring a smile to your face when pushed down the stairs!

From the moment I picked up your book until I laid it down, I was convulsed with laughter. Some day I intend reading it.

Well my rims are 7 or 7.5j wide, cant remember

But they are off a sierra group a car, so i have to space them out 3mm on front, which gives me a scary gap of 1.5mm from the shocker, and have them spaced 5mm on the rear due to the coilovers

I am lowered probably the equivilent of 40-50mm on the front, and between 60-80mm on back depending on my mood

Thats with the arch lips cut off

_________________
Daily isn't so Special. And it makes me sad.
Need space and time and I'll crack on with Jams si!

Catch me on Facebook as I'm rarely on here.