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[ 6 posts ] |
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Ken555
On the Road
Joined: Fri Sep 28, 2007 7:39 pm
Posts: 573
Location: Aberdeenshire
GTM: Cox/Coupe
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 Wheel width and offset. What size wheels is everyone running ?
I was looking at a set of 7" wide wheel with a choice of 2mm or 22mm offset.
Rather than spend time trying out various one I wonder what people were running under the "standard" arches.
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Member No 1185
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| Mon Aug 24, 2009 2:09 pm |
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West
Admin, and Coupe Nutter
Joined: Fri Sep 14, 2007 10:34 pm
Posts: 1769
Location: In the workshop
GTM: Cox/Coupe
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Re: Wheel width and offset. 13 X 6 ET+18
Tyre tread Just covered by standard arches,
West
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IF wile e coyote had a GTM he would have one with Nitrous too! watch out road runner! The First GTM into the 11s then the 10s, PB 10.87 @ 125.5 Mph on A048 tyres, and fully road legal at Santa Pod
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| Mon Aug 24, 2009 3:39 pm |
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Andy
Ready for SVA
Joined: Thu Nov 15, 2007 10:22 pm
Posts: 363
Location: Ireland
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Re: Wheel width and offset. West,
How does the offset measurement work, i need a bit more clearence between the inner wall of the tyre and the coilover setup, how can I check what offset I have and what offset I need so I don't have to run a spacer, I'm only looking for about 5mm or so, I have about 10mm gap at the mo but with a bit of negitive camber and under corner pressure I belive it may rub.
Andy
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| Tue Aug 25, 2009 5:50 pm |
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West
Admin, and Coupe Nutter
Joined: Fri Sep 14, 2007 10:34 pm
Posts: 1769
Location: In the workshop
GTM: Cox/Coupe
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Re: Wheel width and offset. If you have a Zero Offset wheel, i.e ET=0
the mounting face is spot bang in the middle of the wheel.
If you have ET+18, the mounting face is 18mm towards the outside of the rim., pulling the wheel inwards narrowing the track
If you have ET-10, the mounting is 10mm towards the inside of the rim, pushing the wheel outwards widening the track.
Now with everything suspension there are effects, and this has to do with scrub radius, the distance that the SAI/kingpin intersection is from the tyre center line. Also position of the wheel center effects your roll center heights as these are determined from the wheel center line.
You can very quickly move too far away from an ideal and get a very poor handling car that will get very nervous to drive.
West
_________________
IF wile e coyote had a GTM he would have one with Nitrous too! watch out road runner! The First GTM into the 11s then the 10s, PB 10.87 @ 125.5 Mph on A048 tyres, and fully road legal at Santa Pod
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| Tue Aug 25, 2009 7:12 pm |
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gtmdriver
On the Road
Joined: Tue Oct 30, 2007 8:44 am
Posts: 632
Location: Chester le Street
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Re: Wheel width and offset. ........ and if you stray too far away from the standard offset you bu##er up the scrub radius and either loose all the feel from the steering or get massive kickback through the steering wheel.
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GRP rules!
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| Tue Aug 25, 2009 8:13 pm |
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Andy
Ready for SVA
Joined: Thu Nov 15, 2007 10:22 pm
Posts: 363
Location: Ireland
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Re: Wheel width and offset. Thanks for that guys, I will check my offset this weekend
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| Wed Aug 26, 2009 8:38 am |
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