WHEEL & TYRE FITMENT GUIDE

[Leigh200sx]

Excellent post and helped me decide which wheels to go for

[tommy2478]

Excellent mate great write up !! 

[tomarthur]

Tyres come in all different kinds of sizes dependent on application.









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[Stanipkiss]

Fantastic write up Jay 
I have recently acquired a set of Charletons and trial fitted them to my Jetta today and have a few questions for you.

Rear nearside

Front offside


Q1 Would fitting 5mm spacers push the wheel out closer to the ET44 of my BBS VZ033's? (Charlestons have ET51)
Q2 What happens with the spigot if you add spacers? Do you need extended spigots?
Q3 Are these bolts suitable>> http://www.ebay.co.uk/itm/M14-X-1-5-40MM-LONG-EXTENDED-TAPERED-ALLOY-WHEEL-BOLTS-LOCKING-BOLTS-V2-/200999835059?pt=UK_Cars_Parts_Vehicles_Wheels_tyres_Trim_Nuts_ET&hash=item2ecc8615b3

Thanks in advance

[xjay1337]

1) The ET will reduce (wheel will be pushed further out)...5mm on an ET51 will give you an ET46.
2) Spigots don't effect the ET. The Spigots sit in the hub on the wheel so it should have no effect anyway - They fit on spacers provided the CB of the spacer is the same.
3) I don't know what bolts those Charletons take. I would imagine if they are genuine they are 27mm ball seat so you'd need approx 32-35mm ball seat bolts for 5mm spacers.

[Kevin37]

This just solved so many wheel and offset questions I was going to ask. Good and informative

[Donx22]

If anyone is interested I have actually been doing quite alot of research and dynamic testing at work into tyre and wheel size combinations for a future model that is under devlopment and final stages of prototype testing.
Essentailly tyre stretch cause a stiffer sidewall but also speeds up the response time, for example a steering input. this is why BMW actually use a small amount of stretch on their wheels and why the S3 will have 18x8 instead of 18x7.5 pescara's on the same size tyre 225/40/18. it makes that car that little sharper as delay is reduced as well as incereasing steering feel and lowering tyre costs for customers (reducing ultimate grip levels also)

obviosuly this is all good up until a point and then performance drops off but apart from helping with clearance/looks it will effect the dynamics of a vehicle and can be used to peoples advantage if done correctly. 

Nice work on the guide Jay! 
I have an offset/ wheel size/ tyre calcuator in excel that i can stick up if anyone would like, usefull for when drastically changing wheel size. If I can ever help at all or go into more detail, please give me a shout. Self proclaimed dyamics geek

[MightyMullet]

Superb guide jay, helps out with many, many queries I'm sure many of us have!

Top Job!


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[rex]

I would like to add something to Jay's excellent guide:
Even if tires are said to be 225 wide (for example) the actual width differs from one tire (manufacturer and tire type) to another.
For example:
225/45 R17 Dunlop Direzza 03G have an actual width of 230mm
225/45 R17 Kumho v70a have an actual width of 224mm
225/45/17 Yokohama Advan ad050 have an actual width of 227mm
I had some info about some other tires but I can't find it... Anyway, you guys get the idea: if you have very little clearance watch out for the exact tire width not the declared one...

[jonnym]

If anyone is interested I have actually been doing quite alot of research and dynamic testing at work into tyre and wheel size combinations for a future model that is under devlopment and final stages of prototype testing.
Essentailly tyre stretch cause a stiffer sidewall but also speeds up the response time, for example a steering input. this is why BMW actually use a small amount of stretch on their wheels and why the S3 will have 18x8 instead of 18x7.5 pescara's on the same size tyre 225/40/18. it makes that car that little sharper as delay is reduced as well as incereasing steering feel and lowering tyre costs for customers (reducing ultimate grip levels also)

obviosuly this is all good up until a point and then performance drops off but apart from helping with clearance/looks it will effect the dynamics of a vehicle and can be used to peoples advantage if done correctly. 

Nice work on the guide Jay! 
I have an offset/ wheel size/ tyre calcuator in excel that i can stick up if anyone would like, usefull for when drastically changing wheel size. If I can ever help at all or go into more detail, please give me a shout. Self proclaimed dyamics geek

Ahh  missed this, but likewise i'm interested in all this aswell. I focussed on aerodynamics but obviously this all has a lot to do with overall aerodynamics of car in general. No doubt the minor tweet from 7.5 to 8, had a big difference on the technical side of perforamnce.

[Leigh200sx]

Jay this is a quick question for you, I've been told that bentley wheels have a wrong offset for a mk5 golf and they won't work? I've test fitted them and it appears they may work just fine? There 9"x19" et 41..

[xjay1337]

They will be fine with 215/35 tyres mate.
You may catch every so often..rolling arches will be fine :)

[Leigh200sx]

They will be fine with 215/35 tyres mate.
You may catch every so often..rolling arches will be fine :)

Thanks buddy

[Ellisimo]

Hi all,

I don't really understand offset and if a higher one would be closer to the strut or poke more.
So basically would:
18"
9J + 10J
5x112
ET48 front
ET40 rear

fit my golf?

thanks!

[xjay1337]

A higher offset sits further in... and a lower offset pokes more. Thought I put that on the guide?

and no, I specifically mentioned 10"'s not being worth the effort on the back without pulling the arches. And the 9j front would catch the strut.