Would a 265/16 on a 9" Fuchs fit?

[911st]

Wondering if a 265/45/16 on a 9" Fuchs rim would fit having a 10.2 section width?

Is it a tight fit putting 245/45's on 9" Fuchs on a Carrera 3.2/SC body?

For comparison a R1 245/45/16 pm on a 8" rim has a section width of 9.6".

Also, a 255/40/17 Falken tire has a section width of 10.2" on a 9" rim.

[porschecab]

245/45 on 9's is THE fit to have. Most run (or should) 225's on 8's.
I will be running 245 45 16's on 9" fuchs. That extra inch helps solidify the sidewall with a 9" wheel slightly better than an 8" wheel. Of course Johnny Law doesn't want to see this experiment on his roads - only under track conditions - which is where the 9" wheel makes a difference over the 8" wheel. Likely, the only time.

[Racerbvd]

Originally Posted by porschecab

245/45 on 9's is THE fit to have. Most run (or should) 225's on 8's.
I will be running 245 45 16's on 9" fuchs. That extra inch helps solidify the sidewall with a 9" wheel slightly better than an 8" wheel. Of course Johnny Law doesn't want to see this experiment on his roads - only under track conditions - which is where the 9" wheel makes a difference over the 8" wheel. Likely, the only time.

You are correct sir, 265s on 9s would look like baloon tires and lose the benefit of a straight, stiff sidewall.

[KTL]

Originally Posted by Racerbvd

You are correct sir, 265s on 9s would look like baloon tires and lose the benefit of a straight, stiff sidewall.

I disagree. The 9 in. rim is the measured rim width that Kumho publishes for the Victoracer 265/45-16. I have the 245/45-16 Victoracer on my 16x9 BBS RS wheel and it could use a bit more width. I know stretching the section width is a good thing for track performance. But I still wouldn't mind some more section width since I have a lot of rim exposure! I think the addn'l 0.7" of section width in the 265/45 may not be optimum, but the fit would not be ballooned.

Keith,

The 245/45 on a 9" Fuchs on a SC or Carrera is not a tight fit at all with alot of rear camber. I currently have 14mm spacers behind my 16x9 BBS RS with ET +15mm. There's still enough room that I thought about trying my 928 21mm spacers. Might stick out a little too much........... The 14mm spacers look perfect.

[IROC]

Originally Posted by Racerbvd

You are correct sir, 265s on 9s would look like baloon tires and lose the benefit of a straight, stiff sidewall.

Not necessarily. I (and many others) run 275s on 9 inch wheels (17s) and there is no bulging. They fit fine.

Sorry I don't have a better pick here at work, but this pic shows the 275s on 9s in the rear and 245/45-16 on 8x16s in the front...

[Bill Verburg]

assuming that you are looking at one of the Kumho 265/45 tires then yes you are ok.

Once again you will get the most from a tire by using a wheel at the wider end of the spec range than from the narrower end

[911st]

Correct Bill it is the new K70A Kumos I am interested in. A 9" is near the middle of the recommended rim size of 8.5-10" and it is on the size the measure there section width on.

Also, the section width is very close to the same as a 255/17 that the factory and a lot of other Porsche guys are running on 9" rims.

So what is going to perform better on a car that can only get about 3 deg neg camber. A 245 on a 9" rim or a 265 on a 9".

This is a about a 9.1" tread width compared to a 9.9".

The 245 is a shorter tire at about 24.6 v 25".

I am suspect that most get as much out of there rear tires as is possible if the camber and air pressure it right. I would see a 225 that is set up right out hold a 255 that is not.

Is it possible that a 225 on an 8" rim could out hold a 245 on an 8" rim if both are set up right and are of the same type of tire?

All input is appreciated. Thx

[Bill Verburg]

Originally Posted by 911st

Correct Bill it is the new K70A Kumos I am interested in. A 9" is near the middle of the recommended rim size of 8.5-10" and it is on the size the measure there section width on.

Its actually closer to the narrow side, but it is workable

Originally Posted by 911st

Also, the section width is very close to the same as a 255/17 that the factory and a lot of other Porsche guys are running on 9" rims.

thinking about only the single criteria of width is narrow minded, You also want to consider section width and OD. The other criteria of compound/design was obviously considered during the tire selection process

Originally Posted by 911st

So what is going to perform better on a car that can only get about 3 deg neg camber. A 245 on a 9" rim or a 265 on a 9".

Dunno, -3 is plenty for most R/street tires, I would be concerned about the 265 OD vs the 245 but that depends on other criteria, you know how and what you need out of your tires better than anyone else

Originally Posted by 911st

This is a about a 9.1" tread width compared to a 9.9".

again treadwidth isn't the only thing to consider, tread shape is at least as important, the static contact patch is approximately an oval, the more elongated the oval is laterally the more grip can be developed

Originally Posted by 911st

The 245 is a shorter tire at about 24.6 v 25".

that makes a difference in the speed at which peak hp is developed. Taller tires move that speed up, shorter tires move it down.

Originally Posted by 911st

I am suspect that most get as much out of there rear tires as is possible if the camber and air pressure it right. I would see a 225 that is set up right out hold a 255 that is not.

again not so simple because the car has a front end too, you want to balance the grip at each end.

Originally Posted by 911st

Is it possible that a 225 on an 8" rim could out hold a 245 on an 8" rim if both are set up right and are of the same type of tire?

yes