1QUICKS2

As the title says....will a 245-50-16 fit on the rear of a 1989 944S2 stock. Thanks in advance.

joseph mitro

width will fit. aspect ratio is a little tall (should be 245/45)

Serge944

Yes, it will look goofy. I had 225/55/16's on my old rear fuchs (stupid PO) and the car looked like a 60's muscle car. Plus, your gear ratios will be higher.

WesM951

Ditto what Joseph said, the correct tire size would be 245/45/16

hosrom_951

what would the front recommended sizes be if the rear is 245/45/16?

Ken D

Hos--225/50/16

Jfrahm

I use them on 8" 928 flats and on 9" Clubsports, they work quite well and the speedo is a bit more accurate. There is a bit of sidewall bulge on the 8" wheels but no big deal. There is a less than 5% difference in roll-out between the 45 and 50 series.

-Joel.

jmporsche944

this may help
http://www.miata.net/garage/tirecalc.html

mitsumark

Im running 8"turbo Fuchs on the back of my car with a 245 50 16..And the 7"turbo Fuchs on the front with 225 50 16..No negative effects at all..This is an 84..If you need pix,,lemme know and I'll send you some..

Jeff F

I use them and like them. In fact, I just mothballed a brand new pair of 225/50/16" on my 968, (8"C2's) replaced with 245's. My speedo is finally accurate.

Most don't realize when going "plus one" to 17" or larger wheels, they are adding weight if increasing diameter with metal versus rubber. Even with lightweight wheels, metal weighs more. Obviously it also is a matter of taste as well as other tradeoffs. Sidewall flex is more, but ride harshness is less with larger tires. My curb rash days are over, however. Choices.

I plan to do the same on my 951 with the 8" Fuchs. Pleased with the result.

Good luck,

Jeff
'86 951 2.8. Lots of extra stuff
'87 928 S4. Some extra stuff
'92 968 Cab. Mostly stock, and staying that way.

Matt H

This is misinformation. There are 17" wheels out there that weigh less than 15 and 16" stock wheels. Fuchs are dead light but on a late car they arent an option and almost all the quality 17" wheels weigh less than the stock late wheel options.

You can use the 245/50R16, it is not the "proper" size and IMHO it looks like ***. However, it will fit on the wheel just fine, provided you have at least 8" wheels. If you are tracking the car it does change the gearing ever so slightly.
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Jeff F

Matt:

I don't think I was clear. If your goal is purely to increase diameter, rubber is lighter than metal, even with the lightweight wheels, same versus same. You are correct about some larger aftermarkets being lighter than smaller stocks. Different point though.

Again, it is about taste. Folks tell me on this car, with these wheels, that it looks great. I agree, but that is my opinion.

I switched road trip cars from my 928 to my 968. I don't like spinning along in the 3k rpm range versus 2k before with the big car. Larger tires make a noticable difference. To each his own, depending on what they want to accomplish.

Jeff
"86 951 2.8. Lots of extra stuff
'87 928 S4. Some extra stuff
'92 968 Cab. Mostly stock, and staying that way

Matt H

I guess I am still confused, the RPM at a given speed is due to gear ratio, not tire diameter. Now, let me say that you can almost always maintain the stock RD and that the first statement hinges on this one.
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Jeff F

You nailed it when you said you will change your gearing a little at the track. 245/50/16's are bigger around than 225/50/16, or 245/45/16 for that matter. You go further with each turn of engine, differential, any part of the driveline for that matter, so rpm's are less at any given speed.

If I could have found 255/50/16's easy and cheap, I would have pulled the trigger on those. After getting lots of weight out of the 968, I don't notice any acceleration difference with taller tires. Obviously, I don't track this car, the tire combo would not be good for that.

After putting tons of miles on both platforms, I now know why 928 motors last so darn long.

Jeff
'86 951 2.8. Lots of extra stuff
'87 928 S4. Some extra stuff
'92 968 Cab. Mostly stock, and staying that way

Matt H

FWIW, the 255/50R16 can be had, it is a stock size for early C4 Corvette's.

I see what you are getting at now. I had to read it about 5 times (not you but what I am actually working on) but I get it. You are correct, you could ever so slightly lower the RPM at hwy speeds. There is a speedo error factor for that as well.
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