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Wheels (again)
MikeFellows - 26/5/10 at 01:27 PM

I know I have asked what feel like a million questions on wheels, but I just dont get it.

I love the compomotive CXR's and they are nice and light weight

can anyone confirm they will fit over 4pot powerlites and sierra rear calipers (xr4x4 ones I believe)?

if nobody can, how do I go about finding out (where do I need to measure and what measurements do I need from the manufacturer)

and finally...

if they do fit, what size do I want.

I was thinking 13x6 or 13x7 for the front but i dont know which will be better and what the effects of the 1" difference will make.

I would expect the 7" may give more front end grip when compared to the 6" due to being front engined, but what effects is that going to have on turn in?

at the rear I was thinking 13x8 but I really dont know?

I believe I want ET34 for an indy but i dont know why I understand what wheel offset is but I dont know why I need ET34 for an indy)

please help and I wont ask anymore wheel questions I promise.

[Edited on 26/5/10 by MikeFellows]

MK9R - 26/5/10 at 01:51 PM

i have 13x6 crx's on the fury with sierra rear calipers they fit no probs. I have 4 pot Hispecs on the front with no problems, and i know a few of the other RGBers run the Willwoods with the CRX's

skippad - 26/5/10 at 02:19 PM

quote:
Originally posted by MikeFellows
I know I have asked what feel like a million questions on wheels, but I just dont get it.

I love the compomotive CXR's and they are nice and light weight

can anyone confirm they will fit over 4pot powerlites and sierra rear calipers (xr4x4 ones I believe)?

if nobody can, how do I go about finding out (where do I need to measure and what measurements do I need from the manufacturer)

and finally...

if they do fit, what size do I want.

I was thinking 13x6 or 13x7 for the front but i dont know which will be better and what the effects of the 1" difference will make.

I would expect the 7" may give more front end grip when compared to the 6" due to being front engined, but what effects is that going to have on turn in?

at the rear I was thinking 13x8 but I really dont know?

I believe I want ET34 for an indy but i dont know why I understand what wheel offset is but I dont know why I need ET34 for an indy)

please help and I wont ask anymore wheel questions I promise.

[Edited on 26/5/10 by MikeFellows]


Hi Mike
Yes they do fit over the calipers you mention.
For the MK (which is sierra based) ET38 is the norm.
I had the cxr's and 048's on a Phoenix i was building and yes they are the lightest.
7" are about right to fit under MK arches.
Have you found a supplier for the cxr's ?
Dave

PAUL FISHER - 26/5/10 at 02:43 PM

at the rear I was thinking 13x8 but I really dont know?

I believe I want ET34 for an indy but i dont know why I understand what wheel offset is but I dont know why I need ET34 for an indy)

[Edited on 26/5/10 by MikeFellows]



A 8" wide rim at a 34 et will not fit within the standard MK Indy r rear arch,although MK do sell extra wide arches to fit wider rims.

v8kid - 26/5/10 at 04:14 PM

CRX das an internal diameter of 305mm at the hub flange and 313mm at the inner edge. The taper is to allow the wheel to release from the mould when they make em.

Above includes a 3mm clearance for bits of stone/distortion/whatever. Inner edge measurement is for a 8" wheel will be more for a narrower one.

Cheers

barrie sharp - 26/5/10 at 04:49 PM

I have had a problem with dimensions of wheels and have been emailing a guy call Chris Cooke at Compomotive and he has been very helpful so if you need a difinitive answer on the dimensions try him I am sure he wont mind.
chris@compomotive.co.uk or 01902311499

v8kid - 26/5/10 at 04:54 PM

Yup thats the chap who emailed me cad sections of the wheels - v. helpfull guy - pity I never bought them but I got secondhand split rims for a quarter the price!!