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Anyone know if I can run 275's on a 9x17 993 cup rear wheel with stock 951 bodywork?

fast951

Yes you can. You might need to roll the fender's lip if it's not a Turbo S

badcoupe

I run 315's on the rear of my 86 no rubbing with 9" boxter wheels. Had to run spacers cause of my bastard offset

FASTFWD951

You definitely have to roll/cut/grind the inner lip,(actually only the front have), but, yes it will work since this is what I did on my previous 944S with later offset.

Mike Buck

</font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica">Originally posted by badcoupe:
<strong>I run 315's on the rear of my 86 no rubbing with 9" boxter wheels. Had to run spacers cause of my bastard offset</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">Do you have a picture of what this looks like? I run 275's on 10" rims, so I'm just curious.

IanM

IMO, a 315 on a 9" wheels is a bit silly... You certainly wouldn't run that tire/wheel combo for performance reasons. That size tire belongs on an 11.5" wheel. The proper tire for a 9" wheel is 245-255.

If you want to run a 275, get yourself a 10" wheel.

FASTFWD951

Ian is right, I actually have 285/40/18's on 10" rims now, and, it looks good, (so I thought) until I saw the same rims (identical style and size) with 265's, and they look so much better (more of a performance look) I am looking to change to 265/30/18's for my 10" rims. (of course, this is for the rear).

Danno

'IMO, a 315 on a 9" wheels is a bit silly..."

Yeah I wouldn't use any thing more than at 255/40-17 tire on a 9" rim either. The performance gains are minimal if any. A 275/40-17 tire would be best on a 10-11" rim for maximum performance.

"Anyone know if I can run 275's on a 9x17 993 cup rear wheel with stock 951 bodywork?"

Yup you sure can but will require some fender grinding at 10 & 2 o'clock positions (left & right). Also some grinding may be required directly ahead of the axle on the fender as well (9 & 3 o'clock) due to the fender curving inwards there. The 1" taller diameter of the 275/40-17" tire reaches forward and rubs there.

No grinding is needed if you get wheels with increased offset like the TurboS @ 60mm. This places most of the extra width on the inside where there's more room.

With 17x11.5" 60mm offset wheels, you can also use a 315-35/17" with some more grinding at the rear of the fender (10 & 2 o'clock on both sides now). Some careful prying outwards of the fender with a 2x4 on the area directly ahead of the axle will help the tire clear that annoying part.

ringo951

Danno,

Do you think 275's should be run on 9" wheels or would 255's look better.

ringo951

Sorry, Ignore above.. I now see you addressed this in the beginning of your post.

Steve Lavigne

Hmm. 315 mm tires on 9" wide wheels may work well for drag racing.

johne

Steve,
I assume your just acting the fool but incase your not acting.

to Quote Danno above
"With 17x11.5" 60mm offset wheels, you can also use a 315-35/17"

that's an 11.5" wheel

EDIT: ya so that would be me acting the fool not remembering badcoupe's post. Sorrry about that Steve.

Danno

I think Steve's talking about the spinning donut that grows in diameter when the drag cars do their burn-outs. With the severely-pinched sidewalls with a 315/35-17" tire on 9" rim, you might every well be able to do that ... heh, heh

dmoffitt

bump.

what size should I run on 18x10 rear (996 C4S 18" hollow-spoke turbo twists)? 275x35? 285x35? 285x30? also, for fronts, I assume 18x8 should be a 235x40 or so? i'm very close to working out a deal on a set of 18s (just sold my c2 cups) and want to order tires to get here when the wheels do...

Danno

To get as close to stock diameter as possible, you'd want:

F: 245/35-18
R: 285/30-18