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17x8 offset help

Started by _ass308_ , Jan 27 2009 08:00 PM

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6 replies to this topic

#1 _ass308_

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Posted 27 January 2009 - 08:00 PM

i have read through the forum,several times now
it seems a 8 inch rim with 4 1/2 inch backspace,running a.235/40/17.thats a 617mm rolling diameter.fits in the front a a lx torana.with maybee minor srcubing sometimes
my brake assembly comes out 1 inch more than standard.so im thinking i get 1 inch more back space and get 5 1/2 inch backspace ?.
if the answer is yes.ive done the calculations and a 17x8 rim,with 5 1/2 inch back space will be 25mm,wider than the rim on the car at the moment.the tyre will also be 12mm bigger in diameter.the car also has to be lowered yet,around 45mm.
it looks like 1 inch wider will be a tight fit.does any think 1 wider will be to big ?.
current ride height
Posted Image

shots of clearances
Posted Image

ordering the wheels thursday morning.any opinions ?

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#2 76lxhatch

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Posted 28 January 2009 - 08:18 AM

Your numbers seem right to me. Scrubbing at the front on the flare and at the rear on the firewall lip (both only with low speed tight turning) will be the main issue. Increasing the rolling diameter and moving the outside of the tyre out (wider wheel and/or shallower backspace) will both very quickly make this problem worse so be a little careful with what you choose. Clearance with the wheels pointing forward and up inside the flare shouldn't be an issue.

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#3 _ass308_

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Posted 28 January 2009 - 07:41 PM

thanks 76lxhatch.
you are right with everything u say.its why im worried about being "greedy".with my front offset.at the front i have very little original metal behind the flare.and im prepared to trim the flare if i have to.
the back side is my biggest worry.if it hits ill be held up for ages getting a new offset.
the tyre guy is coming around tomorrow to measure up.ill see what he says.but id love just 1 extra inch wider than it is at the moment to start out with.its 62mm from bolt up face to the edge of the rim atm.id like to get it to 87mm.
ill see how i go

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#4 _ass308_

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Posted 29 January 2009 - 07:34 PM

76lxhatch.
the place im buying the rims from,came out today.they measuerd up the clearances.filled out he simmons form.im waiting to here back with the offset they recomend.if they hit.they re do them for free,as long as u gave them the right measurements.ill let u know what they recomend

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#5 76lxhatch

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Posted 29 January 2009 - 08:39 PM

Sounds like a good plan! Will be interested to hear what they think. Saw a couple of flared Toranas at the big show last weekend but they all have quite small wheels and tyres on the front still

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#6 _ass308_

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Posted 31 January 2009 - 09:55 AM

hey 76lxhatch.i just found out what they recomend.
rear 17x10 zero offset

front 17x8 zero offset lol
i asked them to check again,cause i dont think they will fit.how ever.im not the expert they are.if they do fit ill be more than happy.

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#7 76lxhatch

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Posted 01 February 2009 - 03:44 PM

Zero offset = dead centre, so backspacing is 5.5" rear and 4.5" front (rims are generally 1" wider overall than the width which is measured inside the beads). Sounds right to me although the rears may not quite fill out the guards if you still have a standard width diff.

Edited by 76lxhatch, 01 February 2009 - 03:44 PM.