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paulvasey

Active Member

• Oct 26, 2012

• #1

have i just f@%"ed up? need help re tyre sizes. iv just bought a set of 20in kahn alloys with brand new pirelli zeros they were advertised as "off a l322" however the tyre size is 285 35 20 somebody please tell me this is the right size! as ive convinced myself there the wrong size???

 

Saint.V8

Dyed-in-the-wool 100% RR Junkie

Full Member

• Oct 26, 2012

• #2

My 255/50/20's come up with circumfrence of 30.04" or 763mm

285/35/20's comes in at 27.85" or 708mm

which is -7.217% difference - most accept about a 2.5% difference at the very most.

 

Last edited: Oct 26, 2012

sas1810

New Member

• Oct 26, 2012

• #3

go here :-

4x4 Tyres

put your origonal size tyres in, and your new size. it will tell if you are out or within limits.

but it sounds about right. i have 275/40/20 on mine. drives like ****, but looks good.

 

sas1810

New Member

• Oct 26, 2012

• #4

from Saints sizes, you will need 285/45/20 to get a 0.2% difference in speed ratio.

 

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paulvasey

Active Member

• Oct 26, 2012

• #5

not good , do i need 285 50 20 tyres instead?

 

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paulvasey

Active Member

• Oct 26, 2012

• #6

ahh i see, i suppose i can keep the rims and sell the tyres, what a clanger

 

Saint.V8

Dyed-in-the-wool 100% RR Junkie

Full Member

• Oct 26, 2012

• #7

paulvasey said:

not good , do i need 285 50 20 tyres instead?

Click to expand...

If the rims fit - they'll do - but your speedo will be out by 7.21% so at 30 indicated you'll be doing something like 26!!

As SAS says 285/45 will get you closer!

 

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paulvasey

Active Member

• Oct 26, 2012

• #8

just had a look on ebay ,no 285 45 20s but plenty 285 50 20s, how far out are these saint?

 

sas1810

New Member

• Oct 26, 2012

• #9

STANDARD

Rim Diameter: 508mm
Sidewall Depth: 127.5mm
Total Diameter: 763mm
Rolling Circumference*: 2301.15mm

285/45/20

Rim Diameter: 508mm
Sidewall Depth: 128.25mm
Total Diameter: 764.5mm
Rolling Circumference*: 2305.68mm
Changing your wheels/tyres may effect your speedometer reading!
With this new combination your speed will be 0.2% of that inidicated.
When your speedo reads mph you will actually be doing 30.06mph


STANDARD

Rim Diameter: 508mm
Sidewall Depth: 127.5mm
Total Diameter: 763mm
Rolling Circumference*: 2301.15mm

285/50/20

Rim Diameter: 508mm
Sidewall Depth: 142.5mm
Total Diameter: 793mm
Rolling Circumference*: 2391.63mm
Changing your wheels/tyres may effect your speedometer reading!
With this new combination your speed will be 3.93% of that inidicated.
When your speedo reads mph you will actually be doing 31.18mph

 

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paulvasey

Active Member

• Oct 26, 2012

• #10

thats great sas , it seems 285 45 20 are a very uncommon size, ill shop around but may have to go with the 50s

 

sas1810

New Member

• Oct 26, 2012

• #11

yes, normally a 285/45 is on 19's. i did find some for sale but they are around £300 each!. mind you, 285/50/20's are almost the same price.

 

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Andy_J

Active Member

• Oct 26, 2012

• #12

255/50/20 is the correct size for L322

 

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paulvasey

Active Member

• Oct 26, 2012

• #13

has anyone else on here got the kahn 5 spoke 20inch rims? and if so what size tyres have you got on?

 

thought it was mine!

New Member

• Oct 26, 2012

• #14

well 20 inch would be the last figure. p.s. how much is your ganga

 

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paulvasey

Active Member

• Oct 26, 2012

• #15

ha, ive just removed the 22inch kahns it had on when i bought it!