[GRPABT1]

Searching for a wheel that gives me the same track width as my current 15X8's but in a 15X7, I came across these http://www.summitracing.com/parts/CLM-400150713-2/

Now I can't find what the centre hub diameter is but they appear large and say "not hub centric" so I'm wondering if that would mean they should fit over the hubs. Assuming they do clear the hubs but do so loosely would this be a problem, considering on the rear the weight is supported by the wheel studs only?

Also they are stamped for use with 0.625 in. diameter studs and require a 45 degree conical seat nut, would this suit a sierra? I know my nuts are conical but not sure of the angle or the stud size.

So wheel experts, should I buy them?

[alien]

looks like a procomp series 52 would be a better option... thats what i run my KL71's on - theyre a 15x7 -38mm, the biggest offset 15x7 available to my knowledge, its 2.5" backspaced as opposed to the bart's 2" backspace (so will give an extra 25mm width overall).
http://procomp.com.au/Default.asp?MenuId=WHEEL_0052

the valve positioning on those bart wheels looks pretty bad too - sticks the valve right out.

[GRPABT1]

They Barts are actually more -offset at -50 2inch backspacing is more than 2.5 in terms of negative offset

[alien]

ahhh i see, yeah backspacing confuses the hell out of me =) haha

but you wanted to match the width of your current 15x8 - so what's the offset on those?

[GRPABT1]

The current offset is -24 I think. I want to match the overall track width (at least) so they need another inch -ve offset at least over the current rims, so about -50mm.