Wheel /tire fitment question

[greglepore]

Well, I sorta kicking myself today. Bought a set of HRE wheels from a fellow Pelican yesterday. He was more than gracious, and the wheels were a total bargain-no problem there.

They were advertised as 8 and 9's by 17. Of course, neither of us put a tapemeasure to them, and it turns out they are 9x17 and 10x17.

If they were going on a racecar, I'd be gleeful, but they were intended for a street ride. The width difference give rise to 2 questions-

1) I hadn't planned on the expense of new tires as mine are relatively fresh-they're 215/45 and 245/40 Dunlop 8000's-I realize these are narrow for these rims, but can I get away with them for street use only until they're worn?

2)Is there any prayer of getting a 9 to fit on the front of a Carrera - the 7.5 that 's on there now has loads of clearance. I'd prefer not to muck with the fender lip. The seller tells me these were off an 89 Carrera, but ...

PS-I'm not at all upset with the seller; this was at best a mutual mistake and I picked the wheels up, so I coulda measured them. They were also priced so fairly that I might make money on the deal. Its just that I was counting on a low-effort swap, timing is bad for running around right now. If any of you track hounds ae interested in a swap for 8's and 9's, HRE or Fiske (or even converted Fuchs) send me an email.

[Bill Verburg]

Why do you think that they are 9 & 10? Did you measure them? If so, from where to where?

[Jack Olsen]

Yeah, a set of 8x9 wheels will measure closer to 9x10 if you measure from outside edge to outside edge.

[greglepore]

Outside edge to outside edge-I'll redo the measurement. Its odd, though, that its exactly 9x10.

[Kevin Stewart]

you measure the inside edge to get the width, also 10's will not fit a narrow car with out reworking the oil lines, Kevin

[greglepore]

Nevermind, I'm an idiot... They are exactly 8x9 inside to inside.

[marcesq]

What offset are the 8s?? If they are not 23mm they probably won't fit the front unless you have flares.

[Bill Verburg]

Kinesis and Fikse measure out the same way. An 8 is 9" across and a 9 is 10" across.

Now we need the distance form the mounting face to the outer or inner face plane.

Lay a rigid piece of wood across one face and measure as accurately as you can to the mounting face.

[greglepore]

Bill, the backspace is 140 mm to the face of the wheel, and the face to face is 230, so fronts are 25mm offset?

Rears, 143mm backspace, 260mm face to face width, so 13mm?

That sounds right?

[marcesq]

Greg:

If those number are acurate (I don't know how to measure but I do know offsets) you should be ok with some negative camber up front and you might have to roll the lips . . . 215s might just fit though. My experience is with 205/55s, 205/50s and 225/45s up front.

Good Luck

[Bill Verburg]

Yes o/s comes out to be +25mm for the 8x17 and +13mm for the 9x17

Fit will depend on the tires chosen. 225/45x17 should be fairly easy to fit, lips and as marcesq said camber can be adjusted if necessarry, 235/45 etc will need commensurately more work. Mine are 235/45 on 8s w/ the same o/s, lips almost totally removed and normal street camber. For street use I hate track oriented camber settings.

At the back the wheel is 2mm closer to the oil lines and swing arm shoudn't be much, if any, of an issue. Again the tire chosen is key 255/40 or 265/40 should be fine, 275/40 only w a lot of extra work.

If you use 225/45 front then 255/40 rear is a good match, 235/40 & 265/35 is another nice setup.

[greglepore]

Thanks for all the input and help. Bill, in reading a recent Excellence article on the Clubsport 964, one of the comments made regarded 225's degrading steering feel and effort. Is this overblown?

[pjv911]

Heres a set of HRE`S on one of my cars. They are all 23.5mm offset with the fronts being 235/45/17 and the rears at 255/40/17 . The front rims are 8"x17 and the rears are 9"x17 . They fit perfect with all 4 fenders rolled. There is ample room on the rear inside (about 4") for oil cooler lines. Without the rolled lips I think the rears might have been too close. The fronts are close on the inside leaving about .080 clearance between the inner rim lip and the shocks steel protective dust shield. It could easily be removed however if it aint broke dont fix it. The car is being converted to erp billet coilovers at all 4 corners next month and that should open up a whole new can of worms for me. Im hoping for more clearance rather than less. BTW my car has standard front fenders and R/S flares (8") in the rear.

Kurt Williams

[Bill Verburg]

Different folks have different views. I don't know specifically about the 964s but for street use I am sure it doesn't matter. For tracking the 235/265 to 245/275 is certainly preferred. I guess it all comes down to how sensitive you are and how you like the chassis to feel. Chassis setup also affects this issue.

Are you setting up a race car, dual purpose or street only car?

[Bill Verburg]

Looking mighty tasty there Kurt!

[greglepore]

Street for now. Really just wanted to lose a few lbs from the Mille Cup's that came with the car, and these wheels were too good of a deal to pass on. Probably overkill for street application, but at half the price of new Lindsey's, I couldn't pass on them.

I'm likely to be given a 944 when my 86 yr old Dad gives it up-this may be his last season with it, god love him. Thinking that might be the DE car for now.

[Bill Verburg]

For street use 225/45 and 255/40 are your easiest fitments and will perform fine.

If you get a chance I would love to get the weights of those wheels for my d-base. The other #s have already been added.

Still looking for the #s on a true 10x17 that anyone is successfully using on an SC/Carrera

[greglepore]

The 8's are 22.5. I'll email you the weight of the rears as soon as I get the new inner and outer-the other has a tire mounted. Not as light as I had hoped. I believe these are model 340's.

[pjv911]

Check this chart for wheel weights.


www.jimsnodgrass.com/wheels[1].html

Kurt Williams

[pjv911]

Sorry link dont work