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#21669 - 06/10/05 02:06 PM Re: 18" alloy wheels? [Re: MichaelST1]
st_owner100 Offline
Fiesta Mad

Registered: 01/07/05
Posts: 296
Loc: Essex & Hampshire
Quote:

The increase in diameter would take more to do one full turn decreasing the acceleration... wouldn't it?



Correct. you will lose acceleration slightly by fitting larger wheels. And increase the car's turning circle, i think. With regards to wheel mass, my OZ's don't seem all that lighter than the standard wheels when i pick them up, but i'm sure the actual figures are quite different

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#21670 - 06/10/05 02:08 PM Re: 18" alloy wheels? [Re: st_owner100]
st_owner100 Offline
Fiesta Mad

Registered: 01/07/05
Posts: 296
Loc: Essex & Hampshire
Sorry. Raffe is 100% correct there. I forgot the fact that you normally maintain the rolling radius by choosing a different profile tyre. Do this and your acceleration will be the same

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#21671 - 06/10/05 02:32 PM Re: 18" alloy wheels? [Re: st_owner100]
ben_st Offline



Registered: 02/10/05
Posts: 1957
Loc: Gatwick, UK
why change what is already on the ? It handles beautifully as it is and the wheels look cool too. this is a debate that has some many sides to it and i think everyone has a slightly differing view from other people, especially in terms of the car's handling and performance. thats my rant over now lol!:D

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#21672 - 06/10/05 03:59 PM Re: 18" alloy wheels? [Re: ben_st]
tjalve Offline
n00b

Registered: 06/04/05
Posts: 5
Nice with all the replies...but the question isn't about handling/performence or the fact that the 18" weigh more and all the problems that I will have in the future...

I'm just curious if anyone knows something about fitting 18" on the ST.
If I would like 7.5x18 with 215x35x18 is that possible whithout mods?
Or do I have to go with 7x18 with 205x35x18...

Parksey, I agree, 35 would be the correct profile


/tjalve

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#21673 - 06/10/05 06:38 PM Re: 18" alloy wheels? [Re: tjalve]
Nick02 Offline


Registered: 19/02/05
Posts: 2608
Loc: Switzerland
tjalve,
The differrence in outer diameter between your two options is only 7 mm which means that the radius increase is only 1/2 that (3.5 mm). This is less than the difference in diameter between a set of new vs. worn tires. I don't like putting my hand on the fire but I'd say that it's likely they fit. Okay you also have a 5 mm width incease (10 / 2) so maybe this is what you should look at more than the radius increase.

Sorry I can't help more, mine is fitted with 16's and for some reason on these rims they reduced width to 195 so I run a wheel diameter which is 2 cm less than the ones fitted with 17's and 205.

Calculated outer diameter values for reference (in mm):
215x35x18 = 607.7
205x35x18 = 600.7
205X40X17 = 595.8
195x45x16 = 581.9

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#21674 - 06/10/05 07:06 PM Re: 18" alloy wheels? [Re: Nick02]
tjalve Offline
n00b

Registered: 06/04/05
Posts: 5
Thanks Nick!
Just what I'm thinking, the width could be a problem. 7.5" rims and 215 tyres.

/tjalve

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#21675 - 07/10/05 12:48 PM Re: 18" alloy wheels? [Re: tjalve]
Parksey Offline
Fiesta Nutter

Registered: 23/02/05
Posts: 1061
Loc: Winchester
If you can that it'd always be preferable to go with a 18x7 wheel and a 205/35/18 tyre. Not sure how easy wheels and tyres are to get hold of in that size though? Once you go above a 17" diameter the width is normally 7.5".
_________________________
Official www.fordfiestast.co.uk Penguin Ball Champion 2005!

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#21676 - 07/10/05 01:17 PM Re: 18" alloy wheels? [Re: Parksey]
st_owner100 Offline
Fiesta Mad

Registered: 01/07/05
Posts: 296
Loc: Essex & Hampshire
It is diffilcult to find such a dimension, you'll have to go for a 7.5j width. This can easily be done if you play around with the wheel offset (distance between hub mounting face and rim centre line). The standard ST offset is 52.5mm. give me a few days thinking and i'll be able to come up with the offset you'll need for 18's
_________________________
171bhp BTB 4-2-1 Manifold, FIA Homologated Sport Cat, Group N Rear Section Click here for my ST Group N rally replica

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#21677 - 10/10/05 05:58 PM Re: 18" alloy wheels? [Re: tjalve]
Dirkxke_ST Offline
Fiesta Mad

Registered: 12/03/04
Posts: 289
Loc: Belgium
Quote:

Thanks for the replies.
Exactly what Im planing, 35mm lowering and 18"
Why?
Because the car would look awesome....

-->DirkxKe, any pics of that car?

/tjalve



ill have a look for that tomorrow,

in your pm you asked about the dimensions, they are idd 215/40/18. now i am gonna go and sleep for an hour and then i am off to work


Edited by Dirkxke_ST (10/10/05 06:01 PM)
_________________________
ST on my driveway ^^

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#21678 - 21/10/05 02:03 PM Re: 18" alloy wheels? [Re: Dirkxke_ST]
Scotty Offline
Porsche 997 Turbo & ST150

Registered: 27/02/04
Posts: 18100
Loc: Nuneaton, Warwickshire
I would STONGLY suggest you dont put 18" alloys on your

I had 215/35/18 tyres on my Focus and managed to buldge the two front tyres on a trip from Birmingham to Dover to Portsmouth and back to Birmingham... a total of about 500 miles and my wheels could and should have blew out at any time... I was doing 85 all the way back... I am really really glad I checked them as I might not be here saying this today if i hadn't!!!

It is your personal choice, obviously 18" looks better but get the bigger tyres if you are going for them... I'd hate to see anyone experience what I had to contend with... its costly, but more importantly its your life your putting on the line... for what? An extra Inch...

Take Care with your decision.
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#21679 - 21/10/05 02:46 PM Re: 18" alloy wheels? [Re: Scotty]
Gareth Offline
Fiesta Nutter

Registered: 22/07/05
Posts: 2274
Loc: NW London
Quote:

for what? An extra Inch...



What some women would give for that
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#21680 - 21/10/05 02:47 PM Re: 18" alloy wheels? [Re: Scotty]
Raffe Offline
Fiesta Fan

Registered: 11/09/05
Posts: 101
Quote:

I would STONGLY suggest you dont put 18" alloys on your

I had 215/35/18 tyres on my Focus and managed to buldge the two front tyres on a trip from Birmingham to Dover to Portsmouth and back to Birmingham... a total of about 500 miles and my wheels could and should have blew out at any time... I was doing 85 all the way back... I am really really glad I checked them as I might not be here saying this today if i hadn't!!!

It is your personal choice, obviously 18" looks better but get the bigger tyres if you are going for them... I'd hate to see anyone experience what I had to contend with... its costly, but more importantly its your life your putting on the line... for what? An extra Inch...

Take Care with your decision.



I dont understand the point you are trying to make

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#21681 - 21/10/05 09:16 PM Re: 18" alloy wheels? [Re: Raffe]
ST_Nut Offline
n00b

Registered: 03/09/05
Posts: 36
Loc: Peterborough
Your handling will go to pot, so i would suggest getting it lowered rather than increasing the wheel size
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#21682 - 17/11/05 06:44 PM Re: 18" alloy wheels? [Re: ST_Nut]
Slynix Offline
n00b

Registered: 22/09/05
Posts: 5
If I were to go

Front and back:
205/40/17 7.0
Could I be sure it fit?


If I stick my fingers behind my front wheel there isnt much space between the tyre and the spring.
I have the ST 16" rims on now with 195/50. Whats the depth of the them standard ST Rims?

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#21683 - 18/11/05 09:44 AM Re: 18" alloy wheels? [Re: Raffe]
Scotty Offline
Porsche 997 Turbo & ST150

Registered: 27/02/04
Posts: 18100
Loc: Nuneaton, Warwickshire
Quote:

Quote:

I would STONGLY suggest you dont put 18" alloys on your

I had 215/35/18 tyres on my Focus and managed to buldge the two front tyres on a trip from Birmingham to Dover to Portsmouth and back to Birmingham... a total of about 500 miles and my wheels could and should have blew out at any time... I was doing 85 all the way back... I am really really glad I checked them as I might not be here saying this today if i hadn't!!!

It is your personal choice, obviously 18" looks better but get the bigger tyres if you are going for them... I'd hate to see anyone experience what I had to contend with... its costly, but more importantly its your life your putting on the line... for what? An extra Inch...

Take Care with your decision.



I dont understand the point you are trying to make



I think it explains itself, they are really not worth the trouble. 17" are perfect for the and the handling is all set up for those alloys to be on, why change whats right?

As they say, If it aint broken, dont fix it!?
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