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MG MGF Technical - wheel offset

Hi, Ive got a set of 16" MGF alloy wheels. these are the 6 spoke type and are often seen on the MGF cup (racing series) cars. similar to the ones shown on this ebay site.
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&category=72253&item=7950649249&rd=1

Does anyone know what the wheel offset is on these wheels in mm?
regards
Matt
matt

if you have the wheels already the easiest way to find out would be to measure it. Use a straight edge across the back face of the rim as your datum.
David S

Matt, 30mm IIRC (see http://www.mgf.ultimatemg.com/group2/suspension/wheel_options_for_the_mgf.htm)
Rob Bell

Many thanks Rob, I orignially thought it was 28mm because on the inside of the wheel it has a stamped code in the wheel saying CH28. thought it may of been that
matt

Hi,

Matt, the wheel offset is usually stamped on the inside of the wheel as CHnn or ETnn (I have seen both, and neither, on UK wheels). So your wheels are almost certainly +28 mm offset. The wheels on my Rover 214 were stamped CH28, I can't remember what's on my MGF Cup wheels (and I'm not going to take one off to see!).

If you want to measure the wheel offset then measure the distance from the wheel rim to the mating face from both sides, take the small number from the larger, and divide by two.

Regards, Kes.
Kes

Many thanks Kes for confirming my thoughts on this.
matt

Thanks for that info Kes :o)

Do we know what CH or ET stand for? (Other than Switzerland and Extra Terresterials! LOL)
Rob Bell

Hi,

ET (so I read) is the short form of the German word 'Einpresstiefe' which literally translates as insertion depth (does it, Dieter?).

I haven't the foggiest what CH stands for. I'm still looking, occasionally.

Regards, Kes.
Kes

and I've just grovelled under my car looking at the inside of the 16" Abbi/MGF Cup wheels. Stamped on one of the spokes is 16x7J CH28. The things I do....

Rgds, Kes.
Kes

Many thanks Kes. Much appriciated. thanks
matt

Thanks for the explanation of what ET stands for Kes, but the "CH" mystery remains...
Rob Bell

Hi,

Well, maybe. I found this very interesting page (intestesting to rather sad people I mean) at http://www.butler-eng.com/techdocs/passport/chapt2e.asp section 2.10.0 Different Humps.

I can't cut and paste the section so you'll have to look at it yourself, but CH could stand for Combination Hump, a common type of wheel internal contour. Maybe later wheels have the rim contour defined as well as offset.

Also every automotive term you could ever wish to see (except CH) is at http://www.100megsfree4.com/dictionary/ - 15,334 terms. Happy reading!

I'm surprised. Insertion Depth and Combination Humps, and nobody has passed any vulgar comments!

Regards, Kes.
Kes

Who needs to with names like that Kes! LOL

Useful links, thanks :o)
Rob Bell

Hi,

I've just had a further look at the Butler techdocs - just about everything you could wish to know, and probably a little more - about wheels, tyres, and fitting them. A few pages to print and keep, perhaps.

Regards, Kes.
Kes

Thats really helpful to me. Thanks Kes
matt

This thread was discussed between 03/02/2005 and 08/02/2005

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