motobri

Trying to decide on rears & I'm reading the following options for 19 x 10 Ruf wheels:
285/30, 305/30 & 315/25
Ruf recommends 285's
Opinions on ride & appearance on stock height?
May drop to ROW so they would need to work w/that also.

Any pix?
TIA.

Bradford

285/30 is the widest tire for the 10" wheel. When I was running 10" Ruf on the rear, I tried 295 and it ballooned out so I went to a 285. You will need 11" wheel for the 305 or 315.

motobri

Got it,
thanks.

How was the gap?
Were you stock ride height?

ca993twin

motobri,

Be careful... if you have an AWD car (993TT, C4 or C4S), then you must carefully ALSO match the overall tire diameter to the front tires, else you wreck your viscous coupler. I have heard that they can be 5% different, but that sounds like a heck of a lot of difference. I would try to minimize the difference in overall height, front to rear.

DM993tt

no more than 4% is what I hear as far as f to r disparity.

Kein_Ersatz

Here is a table I have compiled based on lots of reading, as I consider what tires to go with for DE wheels. Trying to keep an eye on the 4% rule. But using 11" rear wheel for DE set (996 hollows). Surprisingly (to me) that the spare tire actually seems to have the 4% rule in mind on the front or rear.

ScottMellor

Here is my setup for your list.
Michelin PS2
Front 265x40x18 width= 10.7" Height= 26.3"
Rear 335x30X18 width = 13.5" Height = 25.9"

Ratio= 1.02

ca993twin

Scott is just showing off.

ScottMellor

True, but but I was very cogizant of viscous coupler issues when I chose the meats for the Guap.

ca993twin

Scott,

You must do something about that fuzzy avatar picture. Maybe borrow someone's Canon?

Rufus uses 19" wheels with 11" on the rear. Tire sizes:

315x25x19
255x30x19

If you do the math (I'm too lazy to redo it), these are very close to the stock 18" (285 and 225) overall diameters.

Turbodan

Kein: spare tire is only to be used on the front; if you get a rear blowout you must put the spare on the front and the front wheel on the rear...that is if for some reason you don't want to call a flatbed, which I recommend
for street I run 235/35/19 and 295/30/19 on HREs with lowered supension and IMO looks great with very small gap.

Kein_Ersatz

TurboDan. Good point on spare, I must have skipped that part of the manual

I expect it is flatbed / trailer for me, hope to never have to make that call

rcg412

On BBS RS-GT. 18x8 and 18x10 i was going to go 225/40 and 295/30... any issues with that? Michelin discontinued the PS2 in 285/30

motobri

Since PS2's aren't available in 285's, Opinions on Pirelli Pzeros vs Bridgestones?

kurtv

I have used the Michelin 295/30-18 PS2s on my rears with standard rims for some time with the 225/40-18s on the front on street and track without issue. They have lasted over 20K mi. which is surprising on a 993tt on the rear. I prefer them over the Potenzas S02s it used to have.

I was thinking of trying the Continental Extreme Contact DWs which come in standard 993tt sizes at a very attractive price and get good reviews and tests at Tire Rack. One of the members of my club got a set of Michelin Pilot Sport A/S Plus since he wanted Michelins at a lower price point and possible longevity.