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keitho64's Avatar
 
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245/50-15 Rear Tire Choices with 15" rims

OK so my little ole 911 is in need of new rear tires. It currently has a set of very old Dunlop 245/50-15. The tread is good but there are a lot of cracks and I am a little worried about having a blowout.

The car has a 2.7 with Webers, SSI mild cams and a 901 gear box with a 4.42 (7:31) ring and pinion. All in she weighs 2250.

The transmission gearing is:
1st A = 3.09 (11:34)
2nd F = 1.889 (18:34)
3rd M = 1.318 (22:29)
4th S = 1.04 (25:26)
5th Z = .79 (29:23)

In 5th gear now the car turns 2,800 RPM at 60.

I have 225/55-15 Kumho's in the front and the Dunlop 245/50-15 on the rear with 15x8 Fuchs at all 4 corners. The front tires were new last year.

Since this is a throwback car I would like to stay with the Fuchs.

So my choices are:

Option 1:
Move the 225's to the rear and go with 205/55-15 on the front. I can stay with the same Kumho tire but the shorter tire in the rear will really impact top speed / economy. The car will be spinning over 3,000 RPM at 60. I also think the car would look funny with the smaller tires.

Option 2:
Purchase BF Goodrich Radial T/A's in either 245/60-15 or 295/50-15. Both of these tires are roughly the same height and would result in about 2,600 RPM at 60.

I am not a fan of the Radial T/A's but if I had them shaved I would think they would grip enough. If I ran the Radial T/A's with full tread I am afraid the handling on the car would suffer. This is predominately a street car and the driver is probably not as capable as the car.

So now that you have the background what are your thoughts?

Should I go with a shorter tire but the same Kumo's on all 4?

Do you think the Radial T/A's would work OK if they were shaved some?

Given the face I have enough room would it make sense to go with the 295/50 vs the 245/60?

Option 3:
Or should I bite the bullet and get either 16" or 17" Fuchs? I was thinking about finding a set of 16x8 rims for the rear and just going that route.

One last comment, some time ago I had Turbo Twists on the car with 285/35-18 in the rear and 245/40-18 in the front. I did not like how rough the car rode and personally I felt I could drive the car better with the 50 series tire. With the taller side wall I could feel the car start to slip where the 35 series tire would stick like mad but when it let go there was little warning.

Here is a picture of the car to give you an idea of what it is. It does have the wide flares on the front and rear.

Thanks, I am open to ideas!


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Keitho64
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Old 06-28-2012, 05:47 PM
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How do you use the car? but you seem very worried about rpms at 60mph. Is this a street car? track car? AX car?

225's all around would be fine. Not sure larger than a 275 would fit on an 8" rim though.

You will have many more tire choices in the 17-18" diameters. Even 16's are somewhat limited in selections.
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Old 06-28-2012, 06:41 PM
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tires

You know they do make tires in 265-50-15 for your car and they fit a 8 in wheel...
Old 06-29-2012, 03:20 AM
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In 225/50-15 I have found:
Toyo Proxes RA1 $165
Toyo Proxes R888 $167
Kumho Ecsta AST $69
Yokohama Advan A048 $234
Hoosier R6 $242

In 235/50-15:
Toyo Proxes R888 $186


I haven't looked for wider tires than that; I have 15x7 front and 15x8 rear Fuchs, and I am desperately trying to find good DE tires. I haven't bought any yet, as I am still dithering.
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Old 06-29-2012, 08:44 AM
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The Toyo Proxes may work but since this is a street car I am not sure I want to run Competition / DOT tires all the time. Anyone use these on a street car? It is mostly a sunny day car.

Who makes the 265/50-15? I haven't seen anything in that size.
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Keitho64
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Old 07-02-2012, 03:22 PM
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Buy a set of Kumho's ... you want to keep the tires the same brand and type front and back ... also the Kumho's should only run you about 500 or less for a set of four .. then take the money you saved and buy gas for the car and drive the crap out of it .. the LE Sports I have on my car do great wet or dry and do a few AX's a year .. two years in and they are holding strong .... they have a treadwear of about 340 and are sticky enough .... I like them ... others opinions may vary .. but the LE or the new 4X are getting great reviews at tire rack and Americas ... also Grassroots just ran an article on them not long back and they also found them to be a good all around tire .. and inexpensive ....
Old 07-02-2012, 06:13 PM
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IMHO the 15" wheels looks period correct for the long hoods and the 16" Fuchs
looks right on the short hoods. Keep the wheels FUCHS to keep it looking correct
but if I was to go 17"s, I would opt for the RUF-Speedline wheels..
Look into MICHELIN TB's for 15" availability, its pricey but bling..bling..
Old 07-06-2012, 11:14 AM
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are the 225-55-15 tires still available? I know it's an old ad but you never know.
Rob

Old 12-31-2014, 11:01 AM
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