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Old 19th September 2019, 06:40 PM
garyout garyout is offline
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Join Date: Feb 2016
Location: Gosport Hampshire
Posts: 154
Default Wheel Offset

Good Evening

I am now getting to the stage where I'm thinking about getting a set of wheels.

Question is, Have people used the same offset on all four corners? or are the fronts different to the rear and if so how did you arrive at the required offset for the front?

Cheers Gary
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Old 23rd September 2019, 05:27 PM
voucht's Avatar
voucht voucht is offline
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Join Date: Jun 2011
Location: Lautrec, Tarn (81), Occitanie, France
Posts: 879


I think it depends if you are building a Sierra based or MX5 based Roadster.

The MX5 rear track is smaller than the Sierra rear track (1427mm VS 1468mm). As most of the body kits have been designed for Sierra based Roadster, rear wheel arches are too wide for the MX5 rear end with original wheels, and I often noticed on MX5 based Roadsters that there is an unpleasant looking gap between the outside edge of the rear tyres and the inside of the rear arches (about 20mm on each side). It looks like the car is too small for the bodywork.

On a Sierra based Roadsters, the original Ford Sierra wheel offset (ET35) is OK for both front and rear. Front and rear tracks are exactly the same, and the rear wheels fit nicely in the rear arches, close to the inside edge without never touching it.

But on an MX5 based Roadster, of you keep the original offset (ET40 iirc), you will have the weird gap I'm talking about. So if you can, chose smaller ET (bigger offset), to completely fill the rear arches, the car will look much better.

This problem can also be solved afterwards by using wheel spacers.

Hope that will help
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Old 25th September 2019, 06:16 PM
garyout garyout is offline
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Join Date: Feb 2016
Location: Gosport Hampshire
Posts: 154

Hi Voucht

I am building the mx5 version and they do look silly with the standard offset wheels fitted, I am hoping to at least get one rear arch fitted up over the weekend so I can have a measure up. I plan to use same size on every corner then its not a problem swapping wheels about.

Cheers for you input Gary
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