Compomotive offsets

[stecozz]

Looking to get some 17 inch compomotive mos but what offsets do i need?

Like these...

[BliarOut]

Compomotive know the Griff well, just give them a call and they'll sort you out

[simonej]

I'm sooo close to getting some VLM wheels in 16" front and 17" rear. When I contacted them they knew which offsets were required.

Out of interest, has anyone seen the VLM wheels in the flesh? They look as though the spokes stand proud of the wheel?

[jfjfjf2]

They've stopped making those comp 5 spokes, they still do the similar design 6 spokes (MO 1771 & MO1782).

Julian

[stecozz]

There still listed on the website http://www.comp.co.uk/

[steve-V8s]

http://www.1010tires.com/WheelOffsetCalculator.asp

[jfjfjf2]

MO5's, they have stopped making them. That's according to the person at Compomotive I spoke to when I enquired about buying some.

[RetroTed]

The fronts are normally 7" with a 25 offset and the rears are either 7.5 or 8x17 and have an et35 or et37 offset

Retro

[stecozz]

Will keep an eye on ebay as most cosworths use et 35s,dont know what uses et 25s though?

cheers

[EggsBenedict]

I talked to these guys about a set of these: http://www.performancealloys.com/wheel-details.asp...

Seemed to know what they were talking about...

[RichB]

stecozz said:

Will keep an eye on ebay as most cosworths use et 35s,dont know what uses et 25s though?

cheers

Don't ask why but something in my memory says it was a Puegeot.

[dnb]

Yes, Citroen and Peugeot use ET25 with 4 stud 108PCD.
(I am looking for a cheap pair of 17"x7" ET25 alloys for autotesting if anyone knows of any. Not too bothered about what they look like...)

The offsets quoted by RetroTed are correct. It is possible to get away with ET23 on the front (just) but 25 is better if you can get it. Obviously it will need to be a bit more if you go for 7.5" wide fronts. (Note that TVR used ET35 fronts on the LE Griffs)

[JR]

dnb said:

The offsets quoted by RetroTed are correct.

Not quite. 1 and 1/4 " and 1 and 3/8 " offsets were fitted to the rear. That does not translate into what RT said.

[dnb]

What 7.5" wide wheels had ET31.25? My 7.5" Estorils were ET35 (about 1" 3/8 as you mention) Going to 8" would mean ET35 turns to ET37 give or take.

[JR]

dnb said:

What 7.5" wide wheels had ET31.25? My 7.5" Estorils were ET35 (about 1" 3/8 as you mention) Going to 8" would mean ET35 turns to ET37 give or take.

Non that I know, your maths is a bit out, not that it makes much difference. Going to 8" does not change the ET as this is used to locate the c/l so going to an 8" wheel would not mean an ET of 37.

[RichB]

JR said:

dnb said:

What 7.5" wide wheels had ET31.25? My 7.5" Estorils were ET35 (about 1" 3/8 as you mention) Going to 8" would mean ET35 turns to ET37 give or take.

Non that I know, your maths is a bit out, not that it makes much difference. Going to 8" does not change the ET as this is used to locate the c/l so going to an 8" wheel would not mean an ET of 37.

If I were you I'd stop digging. In order to maintain the relative position the tyre's contact patch you do need to increase the off-set by half the increase in rim width. So, an in crease in rim size of 10mm would mean increasing the ET by 5mm. On TVRs (or any car where you don't want flared arches) it is important to get this right so as not to foul the wheel arch. For anyone reading this thread and contemplating different wheels this is important.

[dnb]

FWIW, I went for 8" wide rears with an ET of 40. This was as close as I could get to "right" off the shelf from Comp (I had a choice of 40 or 42). It doesn't quite fill the arch, so anything from 37 to 39 might look better as long as much wider tyres aren't planned too.

But we are aruing about not many mm here, and most manufacturers recomend a range of allowable offsets so it is an extremely small detail in the grand scheme of TVRs considering they were generally built to the nearest foot.

[JR]

RichB said:

JR said:

dnb said:

What 7.5" wide wheels had ET31.25? My 7.5" Estorils were ET35 (about 1" 3/8 as you mention) Going to 8" would mean ET35 turns to ET37 give or take.

Non that I know, your maths is a bit out, not that it makes much difference. Going to 8" does not change the ET as this is used to locate the c/l so going to an 8" wheel would not mean an ET of 37.

If I were you I'd stop digging. In order to maintain the relative position the tyre's contact patch you do need to increase the off-set by half the increase in rim width. So, an in crease in rim size of 10mm would mean increasing the ET by 5mm. On TVRs (or any car where you don't want flared arches) it is important to get this right so as not to foul the wheel arch. For anyone reading this thread and contemplating different wheels this is important.

Cheek. And incorrect.

[JR]

dnb said:

FWIW, I went for 8" wide rears with an ET of 40. This was as close as I could get to "right" off the shelf from Comp (I had a choice of 40 or 42). It doesn't quite fill the arch, so anything from 37 to 39 might look better as long as much wider tyres aren't planned too.

But we are aruing about not many mm here, and most manufacturers recomend a range of allowable offsets so it is an extremely small detail in the grand scheme of TVRs considering they were generally built to the nearest foot.

I know what you're getting at but it's tyre related not wheel. Within the width of tyres that TVR fitted to the rear (225 to 245) an 8" rim with ET 35 would be appear to be ideal.

[BliarOut]

265 will go under the rear but it's bloody tight!