Rear Wings and Wide Wheels

[Dave Wilson]

I'm looking to fit some 9" CXR rims with an ET12 offset to enable 235/13" tyres to be fitted. Seemed like a reasonable plan, but I need to "extend" rear wings by about 50mm to cover now exposed tyre. Can you buy wider wings or is a case of getting out the fibre glass kit?

 

Cheers

 

Dave

[paul cardy]

Hi Dave

 

Speak to Freestyle Motorsport from memory they make some wider rear wings .

 

 

Regards

 

Paul

[k80rum]

As do Redline - 40mm wider fibreglass wings off-the-shelf

 

I was going to use mine as a buck to make some in c/f (the Mog ones are pretty expensive) but have yet to get around to it

Darren E

 

K80 RUM Website and Emerald maps library

 

Edited by - k80rum on 30 Oct 2009 07:47:53

[BBL]

MOG Racing/Westermann Motorsport make some, which I believe are the same ones offered through Fluke Motorsport, and possibly Freestyle Motorsport as well. The ones on my car were sourced through Freestyle, and while I am not 100% sure of the materials used, they appear to be a cf/GRP hybrid construction.

 

---

Sean

[Richard Price]

Dave,

Andy Griffiths has been using a pair of the Redline wider wings to cover his 10" MB's.

 

I seem to recall that they were comparitively cheap.

 

His MB's with 6" inners, and 4" outers, will have almost exactly the same backspace as your proposed 9" CXR's.

Are you sure that you'll need wider wings at all? They'll only protrude 1/2" more than the standard MB 8.5" wheels. With wider wings, its likely that you could also fit wheel spacers.

 

 

 

 

Edited by - Richard Price on 30 Oct 2009 09:13:25

[Irrelevant]

MOG ones are wider than Redline ones but look a bit shyte as they are not 'Caterham' shape - they have a curved top. Redline ones have a flat top like stock Caterham ones.

[Jason Plato]

I would try and go for ET 0, as this will place less load on the bearings (that are already weak)

 

The other option is to add some ventilation strips between the std wing and body to aid brake cooling and heat extraction.

 

 

here is my Duratec R .... C7 TOP

Taffia AO

[Richard Price]

Dave J,

From reading Compomotives web site, I'd guess that when they specify a wheel as ET12, or ET0, then, using their info as a guide, ET12 would be more inset, and ET0 would be more outset, so ET0 would put MORE load on the wheel bearings, not less.

 

 

[Jason Plato]

load is imparted onto the bearing in either way - offset or inset, the ET0 will place the flange of the hub in the center of the rim, given the opportunity I would go for a zero, thats all I meant.

 

The CXR's are also a bit tricky in that they have a lip on the outer rim that adds circa 6mm to the actual offset, but doesnt feature in the position of the actual tyre as the bead is a separate from the edge of the rim - it that makes sense.....

 

dj

 

 

here is my Duratec R .... C7 TOP

Taffia AO

 

Edited by - Dave J on 30 Oct 2009 13:40:01

[Richard Price]

Dave J,

The key issue is not where the flange is, but where the centre between the two bearings is. At a guess, I'd say that the centre of the bearings is some 50mm inboard of the flange.

If that is the case, then wheels with ET50 would impart the least load on the bearings.