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 Offset and tyre stretch thread!

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richardc9052
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PostSubject: Offset and tyre stretch thread!   Sun Jan 22, 2012 10:56 am

Ok lads, a lot of people have been asking the same questions and i also know a lot of peoples "secret wheels" that they are going to use haha.. well this thread is so you dont have to share that info with even me Very Happy

It can be confusing but if you want to have the right stance you can A: Guess and get lucky or B: Spend time working it out Very Happy

You need to know

et (offset) measured in mm
j (width) measured in Inches
inch (size) measured in Inches

If you have an et0 wheel it means that the hub will meet the wheel at dead centre and on most wheels will mean that you end up with dish Very Happy



You wont end up with dish if the wheel design is concave or flat with extended backing..

Just to get this straight.. you can fit almost any width wheel (realistically most will be 11j) but the wider the wheel the lower the offset will have to be so as to avoid hittin the shock strut.

This will push the wheel outward to and then past your arch depending on how far you go.

Now to standard wheel fitment.. http://www.carlsalter.com/toyota-wheel-fitments.html

Ive gone with the corolla fitment of 4 x 100 (pcd), et35-38(offset), 54(centre Bore, can be changed with spigot rings)

The standard steel wheels are normally 14" x 15.5j
You should use these as the base for fitting wider and/or lower offset wheels.

This is how you should work out the correct et(offset) and wheel size you can run.

Measure the space between the wheel lip and the outer arch and between the inner lip and shock strut.
In the front arch of a e10 corolla with standard struts you have about 1 1/5 inches outer lip and 1 1/2 inches inner lip

So that gives you around 3 inches to play with.

which means that you could have an 8.5j et35 wheel in there with no problems providing your tyres arent wider than your alloys..
For perfect wheel fitment you should go with an 8-8.5j..

a 9j et35 wheel would hit the the strut and protrude from the arch slightly..

to fit a 9j wheel you need either a spacer or lower offset.

the perfect offset for this is 9j et32 as it will move it 3mm further out from the arch and 3mm away from the strut. (which is enough unless you start throwing in massive camber)

so now your left with a wheel that is sticking out from the arch by about 6mm and clearing the strut by 3mm.

So you should get your arches rolled to fit the 9j wheels. at 6mm you dont need to get the arches flared as using a smaller tyre you can clear a rolled arch without rubbing.

For those who havnt seen a stretched tyre:



And this is why using a stretched tyre will help you clear the arch:




If you have wheels you want to check for the best tyre fitment look here: http://tyrestretch.com

Stretching your tyres gives you a stiffer sidewall, a rougher ride but better handling. a lot of people don like tyre stretch as they believe its dangerous.. but the stories of dangerous tyre stretch come from things like this..



Here is an offset calculator that you can use aswell, could come in very handy.. you still need to take the measurements and compare but it tells you how much the wheel would travel in each direction and saves you from doing those calculations Very Happy
http://www.1010tires.com/WheelOffsetCalculator.asp



Note; I wrote this as i came from my head.. it might not make sense.. so if it doesnt let me know haha Very Happy

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pudgeymac
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PostSubject: Re: Offset and tyre stretch thread!   Sun Jan 22, 2012 12:10 pm

good tread Very Happy

it will answer alot of peoples questions
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ianolawlor

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PostSubject: Re: Offset and tyre stretch thread!   Sun Jan 22, 2012 12:28 pm

should be made sticky Smile
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pudgeymac
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PostSubject: Re: Offset and tyre stretch thread!   Sun Jan 22, 2012 12:32 pm

ianolawlor wrote:
should be made sticky Smile

x2 cheers
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richardc9052
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PostSubject: Re: Offset and tyre stretch thread!   Sun Jan 22, 2012 12:40 pm

ianolawlor wrote:
should be made sticky Smile

pudgeymac wrote:
ianolawlor wrote:
should be made sticky Smile

x2 cheers


Thanks lads Very Happy
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jbarry
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PostSubject: Re: Offset and tyre stretch thread!   Sat Feb 04, 2012 12:40 pm

just seen this now great thread richard
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jumojn

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PostSubject: Re: Offset and tyre stretch thread!   Sat Feb 04, 2012 2:15 pm

Nice info mate! Yea stick this please! Smile
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Corolla TRD

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PostSubject: Re: Offset and tyre stretch thread!   Tue Mar 06, 2012 6:31 pm

Good thread very helpfull
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RMulvany
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PostSubject: Re: Offset and tyre stretch thread!   Mon Apr 09, 2012 12:35 pm

can anyone tell me if 15" 8j 15et would stick out too much on an e11 corolla??
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richardc9052
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PostSubject: Re: Offset and tyre stretch thread!   Mon Apr 09, 2012 12:43 pm

Measure 3 and a third inches from the hub and that's how far the lip will be,
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ukcam86
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PostSubject: Re: Offset and tyre stretch thread!   Mon Apr 09, 2012 1:27 pm

my ssr mk 3's are 14x8.5j with 160's nankang Razz serious strech Shocked
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tonyae86

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PostSubject: Re: Offset and tyre stretch thread!   Fri Jul 06, 2012 12:09 pm

Excellent simple thread. Good work
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rolla1013
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PostSubject: Re: Offset and tyre stretch thread!   Tue Apr 30, 2013 9:41 pm

good info mate
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