jyoon

I was wondering how you can determine the max and min size tires that can fit on a give size wheel. Can you put a tire that has a size narrower than the wheel? Specifically, i'm looking for tires for a 9.5" wheel and was wondering if a 245 tire would fit. it's a 16" Wheel, so the tire sizes are becoming limited. Thanks.

Bill Gregory

One way is took look at tire manufacturer data, which typically list the rim width ranges for each tire. Looking at Michelin MPSC's, Yoko A032R, Kumho Victoracer, and Bridgestone S03's in 245/16 rim size all show 7.5-9" for rim size.

User 462021

I have a program I can email you. PM me if you are interested.

Danno

"Specifically, i'm looking for tires for a 9.5" wheel and was wondering if a 245 tire would fit. it's a 16" Wheel, so the tire sizes are becoming limited."

That's perfectly OK. I'm using a 245/45-16 tyre on a 16x10" wheel. Generally for maximum performance, you want to use the widest rim possible for any given tyre size. So if a 255/40-17 tyre is listed as being OK for 17x8.5-10" rims, you want to use a 10" rim because the sidewalls would be the stiffest on that rim. The turn-in would be very, very crisp and the breakaway characteristics would be very smooth.

Another way to look at this is to examine the progression of tyre-widths vs. rim-widths as you go up the food-chain to the more exotic cars. As the performance of the car increases and the compromizes taken for costs are reduced, the rims get wider and wider for any given tyre size. This generally culminates with the tyre & rim-widths one sees in the ALMS, IMSA, LeMans series where the rim-width equals the tyre's section-width. This table also shows this progression:

Southampton76

Having just become the owner of a 90 964. I want to switch out the current chromed D90 wheels in favour of with some cup 2 wheels. Do 225 tyres fit 7" front's and 255 fit the 9" rears? This seems to be a good comdination. Are spacers required on the front's. My 90 964 has been lowered with H&S springs and bilsteins.

Last question, a good place to buy Cup 2's.

Thanks

Mark

Matt H

Yes, 225/255 is a good combo on those wheels.

As to the other question a 245 on a 9.5" rim is going to look a little funny but should work just fine.
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