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post #1 of 4 (permalink) Old 05-04-03, 10:50 PM Thread Starter
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Bigger tyres on stock rims

I am also thinking about swaping out my stock 3.08 diff with the xr lsd 3.45 dif for better acceleration. It seems doable but I want to know about putting more rubber on my stock AU S (xr6 series 1) 16" rims. There is a good calculator at another ******** site that lead me to belive that I would be best served but putting 255/65's in or if that is too extreme then maybe some 245/65's. Can that be done or are rim's only good for one size of tyre? I know next to nothing so a tutorial would be good if anyone would care too.

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post #2 of 4 (permalink) Old 05-05-03, 04:18 AM
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have a read of this-

if you're gonna stick wider tyres on the 16" rims, you'll need to get a lower aspect ratio(aspect of 65 means sidewall height is 65% of tyre width, or something like that). i had 15" rims with standard tyres of 205/65 R15, so i upgraded to 225/60 R15.. more width + less sidewall = same diameter.

find out the width of your rim, and the overall diameter of your current tire. look at various tyres and see what widths you can get that will fit that rim, and that come out with the same (+- 3%) diameter.

lastly, fatter tyres dont always help grip but oh, don't they look hot!

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post #3 of 4 (permalink) Old 05-05-03, 08:31 AM
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Some insurence companys will void you if you put tyres that were not recomended for that rim (the tyre chart sticker from the factory). They'd only accept bigger tyres if you get the rims to go with them.
post #4 of 4 (permalink) Old 05-05-03, 07:29 PM
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Ok, an AU XR6 16" rim is 7" wide max. Max tyre width for a 7" rim, at a stretch, is 245 - 235 is probably better. Standard tyre is a 215/55 R16 (Falcon S) or a 225/50 R16 (XR6 HP) . You go down about 5% in aspect for each 10mm increase. You would probably be looking at a 235/45/16 or 245/40/16. Either of these sizes would not be a common size, so you would probably be looking at over $350 per tyre.

Or if you have the 215s, go for the 225/50/16 - they are a bit wider and will be around $140-$250 per tyre.


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