offset help

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SecaBoy
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offset help

Post by SecaBoy » Tue 26 Jul, 2011 11:45 am

need someone to confirm if i'm right please... :)


standard wheels are 8" wide and an offset of +36mm

new wheels on the front will be 8.5" wide and an offset of +35mm
so, the fronts are fine because its only 5mm less on the inside and extends 7mm more on the outside.

BUT

new wheels on the rear will be 9.5" wide and an offset of +35mm
so, the end result is 18mm less on the inside and 20mm more on the outside...


the question is (and i know its a stupid one!).... if i go and get a tape measure and measure the clearances between the standard wheel and the guard, that should tell me if it'll fit or not, yeah?
1991 Toyota Corolla Seca ==> SOLD
2001 Subaru Impreza WRX ==> SOLD
2006 Honda Accord Euro Luxury ==> SOLD
1990 Nissan Silvia RB20DET ==> SOLD
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cGr
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Re: offset help

Post by cGr » Tue 26 Jul, 2011 12:19 pm

SecaBoy wrote:the question is (and i know its a stupid one!).... if i go and get a tape measure and measure the clearances between the standard wheel and the guard, that should tell me if it'll fit or not, yeah?
That will tell you if the wheel fits in the guard when the suspension geometry is at that angle, but the geometry will change as the wheel goes through its motion of travel.

You will need to hang out the back of the car while you drive along in varying conditions to complete the full range of measurements required to confirm whether the wheel will fit.

Mind your fingers.

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SecaBoy
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Post by SecaBoy » Tue 26 Jul, 2011 12:42 pm

hmmm, thats quite involved!! :lol:

do you measure from the outside of the wheel or the inside where the centre of the wheel is?
1991 Toyota Corolla Seca ==> SOLD
2001 Subaru Impreza WRX ==> SOLD
2006 Honda Accord Euro Luxury ==> SOLD
1990 Nissan Silvia RB20DET ==> SOLD
2008 Toyota TRD Aurion 3500SL ==> SOLD
2010 Ford Falcon XR6T ==> SOLD
:cry
2016 VW Polo 81TSI DSG

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cGr
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Post by cGr » Tue 26 Jul, 2011 1:30 pm

I'm confused about the question.

Offset is measured on the inside.

If you want to measure overall clearance (not taking in to consideration tyre width), then I'd measure from the centre of the wheel.

If you're worried about overall clearance to guard (combination of offset+profile+tyrewidth+suspensiongeometry+whateverelse) then you're going to need more than 1 measurement, a calculator, and remembering what your grade 10 maths teacher taught you.

I suspect that you are going to be close to clearing the guard (otherwise you wouldnt have bought these wheels), but there are just going to be too many variables for you to get out with a ruler to see whether they are definitely going to fit or not. Even the brand of tyre could be the defining factor between it clearing and rubbing (not all tyres are the same width).

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SecaBoy
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Post by SecaBoy » Tue 26 Jul, 2011 1:34 pm

thanks cam... you answered my question even without understanding it.. :lol:


bring on 8.25cm of dish!!! :D
1991 Toyota Corolla Seca ==> SOLD
2001 Subaru Impreza WRX ==> SOLD
2006 Honda Accord Euro Luxury ==> SOLD
1990 Nissan Silvia RB20DET ==> SOLD
2008 Toyota TRD Aurion 3500SL ==> SOLD
2010 Ford Falcon XR6T ==> SOLD
:cry
2016 VW Polo 81TSI DSG

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Chaser
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Post by Chaser » Wed 27 Jul, 2011 10:20 am

you can always use an offset calc

willtheyfit.com
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