Victoracers are not available in 205, will a 225 work well?

 

I used 225/50/16's for a couple of years on my 86 951 (w/ stock phone dials), as did/do a number of auto-xers I know. You will get some tire rub on the fender lip w/ stock alignment during hard cornering. Rolling the lip up helps a bit, but you really need a track/auto-x alignment to fix it, -then there's no problem.

 

Porsche uses a 225/50/16 on the front of the 951S on a 7" wheel, so physically it will fit on the wheel fine.

 

They were working fine both on PDs and D90s on mine.
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They will fit, but in my opinion, they are a little too wide for a 7" rim as there will be a lot of sidewall (and sidewall flex, which slows down tire response).

TonyG

 

Ditto to what TonyG says. That size tire really is a better match to a 8" wide rim.

Tifo

 

So, you're saying a 245 is a good match for a 9" wheel then?

(If 205 is good for 7, 225 is good for 8...then 245 you're saying is good for 9?)

I have to disagree with that statement if that is what you're saying. A 245/45/16 on a 9" wheel looks quite undersized

 

It may look "undersized", but that's how it should look. To put it shortly, when the tire rolls a bit the sidewall will line up with the rim edge.

"undersized" not cool for looks or rim protection, but better for track.

For example, on my track rims I'm running 225's on 8" rims and 255's on 10" rims. Michelin Pilot Sport Cup tires

Almost all modern Porsche's run "undersized" with their OE rubber, IIRC

 

So then why did Porsche throw a 225 on a 7" wheel on the 951S? Purely for rim protection when parking?

 

There are acceptable ranges of rims for every tire size, if I get bored on Monday I will scan it for you. 205 is actually suited better to a 6" wheel. Same as virtually every car made that has them: from Pontiac's to Mitsu's. As a point of personal preference my 245 looked undersized on an 8" wheel (another lister or tow would be happy to back that up). Also, keep in mind that every manufacturer has a little different width, etc. Two tires of the same size made in different factories on the same week are almost surely a tad different. For reference, my 225/50/16 S-02s were a little wider than my 245/45/16 S-02PPs. The design of the wheel also make a small difference. On the D90s the 225 looked and drove just right. On my new Boxster wheel the 225 looks FAR to wide (because the rim has a rolled lip).
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FYI the acceptable tire sizes vs wheel sizes can also be found on tirerack's website.

 

Have you measured your front wheel without a tire? I know some who track 951 S's and claimed the "7" front wheel is really closer to 7.5? Never measured the set I had.

What about the 928 GT?
stock wheels were 7.5/9 Design 90's with 225/245 tires
optional wheels were 8/9 Club Sports with 225/245 tires

What about the 968?
stock wheels are 7/8's 16 inch with 205/225 tires
optional wheels are 7.5/9 17's with 225/255 tires


An M030 944 S2 is equipped like a stock 928 GT


I think the trend on the high performance version of a given car is to "undersize' the tires as you say. IMHO

 

I'm running 225/50-15... been great. Dunno about any sidewall flex, they seem much much better than the 205/60-15 Dunlops that were on there...

 

Mike, all wheels measure about .5 wider than they actually are. This is because of the way the caliper used to measure them takes the reading. When I used to mount/balance a lot of tires, we would see this on virtually every wheel known to man. The 7 inches would be from inner bead to inner bead the caliper (most often used for measuring) is from outer rim lip to outer rim lip.
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I meant to say 7.5" bead to bead. This is how some justify running 8.5" front wheels in E-stock PCA club racing