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Author Topic: wheel size and tyres  (Read 3101 times)

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jaffa

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wheel size and tyres
« on: March 28, 2008, 03:43:55 AM »
right after ditching the escort cozzie wheels ive found a nice set of et38 7x16 pcd 4x108 wheels  
my question is what size tyres would i need to keep the same rolling radius so speedo isnt out
and not affect the acceleration or top end and not have to change from struts to coilovers

i know its a lot but you guys havnt steered me wrong yet  

fingers crossed



Offline Dave

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wheel size and tyres
« Reply #1 on: March 28, 2008, 10:26:30 AM »

Lots of calculators on the web mate that will tell you.

Have a play with this one.

http://www.1010tires.com/TireSizeCalculator.asp]http://www.1010tires.com/TireSizeCalculator.asp

It's the fronts that you need to be careful with espically if lowered as either they will rub on the shocker or wack the wheel arch over a bump.

Either test fit a tyre or fit rim & take some measurements then compare to the calculators to see how close it is.
Dave

jaffa

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wheel size and tyres
« Reply #2 on: March 28, 2008, 12:43:29 PM »
Quote from: Dave
Lots of calculators on the web mate that will tell you.

Have a play with this one.

http://www.1010tires.com/TireSizeCalculator.asp]http://www.1010tires.com/TireSizeCalculator.asp

It's the fronts that you need to be careful with espically if lowered as either they will rub on the shocker or wack the wheel arch over a bump.

Either test fit a tyre or fit rim & take some measurements then compare to the calculators to see how close it is.

thanks mate ill have a play later the car is lowered but the standard size dont rub so im thinking if i keep to the same radius i should be okay

jaffa

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wheel size and tyres
« Reply #3 on: March 29, 2008, 02:44:40 AM »
Quote from: jaffa
thanks mate ill have a play later the car is lowered but the standard size dont rub so im thinking if i keep to the same radius i should be okay

had a play and it came up with this

Stock Tire - 195/55R15         >Search Tires  Tire 1 - 205/45R16         >Search Tires  
Section Width: 7.67 in 195 mm
 Section Width: 8.07 in 205 mm
 
Rim Diameter: 15 in 381 mm
 Rim Diameter: 16 in 406.4 mm
 
Rim Width Range: 5.5 - 7 in
 Rim Width Range: 6.5 - 7.5 in
 
Overall Diameter: 23.44 in 595.37 mm
 Overall Diameter: 23.26 in 590.80 mm
 
Sidewall Height: 4.22 in 107.18 mm
 Sidewall Height: 3.63 in 92.202 mm
 
Radius: 11.72 in 297.68 mm
 Radius: 11.63 in 295.40 mm
 
Circumference: 73.63 in 1870.2 mm
 Circumference: 73.07 in 1855.9 mm
 
Revs per Mile: 887.3
 Revs per Mile: 894.2
 
Actual Speed: 60 mph 100 km/h
 Speedometer1: 60.4 mph 100. km/h
 
Speedometer Difference: - Speedometer Difference: 0.777% too fast
Diameter Difference: - Diameter Difference: 0.77%


Offline Dave

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wheel size and tyres
« Reply #4 on: March 29, 2008, 09:10:20 AM »
Looks O.K  

What you need to be careful of is the offset of the front rims & the width of the tyre for the reasons I said before.

It's tight at the front on a 4be.
Backs have alot more room.

Yours are already abit bigger than most as it runs the later spec 195 55 15 which is slightly bigger than earlier cars to help with mpg.

A little test fitting is always the best as Sierra's actually vary a fair bit on panel fitment.
Some wheels will hit the front arches on one car but not another.

Road wheels (ET26) on mine are 195 60 15 but my front track is 8mm less than STD due to how the brakes are fitted.

The 24V TT has 225 55 16 tyres that would not fit a STD car.
« Last Edit: March 29, 2008, 09:11:50 AM by Dave »
Dave

jaffa

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wheel size and tyres
« Reply #5 on: March 29, 2008, 13:01:14 PM »
Quote from: Dave
Looks O.K  

What you need to be careful of is the offset of the front rims & the width of the tyre for the reasons I said before.

It's tight at the front on a 4be.
Backs have alot more room.

Yours are already abit bigger than most as it runs the later spec 195 55 15 which is slightly bigger than earlier cars to help with mpg.

A little test fitting is always the best as Sierra's actually vary a fair bit on panel fitment.
Some wheels will hit the front arches on one car but not another.

Road wheels (ET26) on mine are 195 60 15 but my front track is 8mm less than STD due to how the brakes are fitted.

The 24V TT has 225 55 16 tyres that would not fit a STD car.

the guy said they are et38 which is the right offset trouble is the wheels are in scotland!!!

might be a case of just buying the wheels and taking them to a tyre place down here and having a play with tyre sizes?  

Owain

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wheel size and tyres
« Reply #6 on: March 29, 2008, 14:55:48 PM »
i would have thought 205/45/16s would be ideal for you mate

Offline Dave

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wheel size and tyres
« Reply #7 on: March 30, 2008, 21:29:07 PM »

Hmmm well will be hard to test fit then  

The 38 offset + the fact they are 7 inch wide rims will make them tight on the front.

If you go back a page on that tyre calculator there is a offset calculator + loads of other info.

http://www.1010tires.com/tech.asp]http://www.1010tires.com/tech.asp

If you put in the STD XR4x4 rims you can compare with new ones.


Dave

jaffa

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wheel size and tyres
« Reply #8 on: March 30, 2008, 23:54:52 PM »
Quote from: Dave
Hmmm well will be hard to test fit then  

The 38 offset + the fact they are 7 inch wide rims will make them tight on the front.

If you go back a page on that tyre calculator there is a offset calculator + loads of other info.

http://www.1010tires.com/tech.asp]http://www.1010tires.com/tech.asp

If you put in the STD XR4x4 rims you can compare with new ones.

cant remember the size of the standard wheels and the car is 30 miles away in the paintshop!!
     

Owain

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wheel size and tyres
« Reply #9 on: March 31, 2008, 20:03:58 PM »
i have 17's on my saff with an et38 offset and a 205/40/17 tyre on the front, lowered 30mm and very rarely caught the arch lip, all i have done now is folded the arch lip in a bit, only on the drivers side and it hasn't caught since

 

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