Go with four 6" rims. It's all but impossible to fit
anything wider than 7" under stock fenders...even with
the ideal offset, you'd need to trim the upper snubber
stops down and flip the front springplate bolt after
grinding the head thinner - and that's with the `71-up
single springplate, I don't think it's feasible with
the double springplates on a `70. In front you may
have issues with inner sidewall clearance to the beam
and swaybar/clamps and may have to screw in the
steering box stops (resulting in a larger turning
circle)...it'll depend upon the tire size choice and
rim offset, but 6" is "do-able" if the front isn't
lowered too much. Do you know the offset ("ET"
number), or the backspace measurement on the rims
you're looking at? You can compensate for too much
with spacers, but if it's too little you'll be
screwed.

BTW, I disapprove airshocks on a VW for a multitude of
reasons. You should be adjusting your rear ride height
if needed by reindexing the torsion bars instead. 

195/65-15 would be a comfortable fit on a 6" rim and
approximately the same diameter as the stock 165-15 -
stay close to that. 195/60 or 205/60 are possible
alternatives that won't mess with your gearing/speedo
accuracy by too much.
 
--- Henry Yap <[EMAIL PROTECTED]> wrote:

> A question from our local club, I thought I would
> post to the great
> minds on the list..... Henry
> 
>  
> 
>  
> 
> I sincerely hope that you can help me. I have a 1970
> beetle that I have
> renovated and I'm in the process of getting new rims
> and tires, but here
> is my dilemma. 
> I can buy four aluminum rims 15x6 for the car or I
> can buy two rims 15x6
> for the front and 15x8 for the rear. I want the rear
> tires to be a
> little wider and taller than the front tires. 
> I also have air shocks on the rear. Now my question
> is this can I buy a
> wider tire and put it on the 15x6 for the rear and
> buy a lower tire for
> the 15x6 for the front, or do I have to go with the
> 15x6 for the front
> and 15x8 for the rear. 
> 
> The other question is with air shocks what size
> tires can I put on the
> rear?



 
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