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Jeff Alton's Avatar
 
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how wide front tire are you running?

Just curious what width front tire you folks are running? Also, if you have aftermarket wheels, I would be interested to know either the backspace or offset of your wheels (width too) and tire size.

Cheers
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Last edited by Jeff Alton; 10-12-2007 at 09:14 PM..
Old 10-12-2007, 09:06 PM
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Kenisis wheels

Front: 245mm wide on 17" wheels
Rear: 315mm wide on 17" wheels

Not sure on offsets but the 245 is the widest you can fit up front with stock flares. I'm converting to RSR bodywork and will run 275's up front with 335 in the rear (trying to fit 455's).
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Old 10-13-2007, 01:18 AM
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225 Front.
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
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Old 10-13-2007, 04:31 AM
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255/40 zr17 on 9inch wheels. Offset is the same as C2 turbo cup rear wheels. Others have run 275's on 9.5" wheels.

Regards,
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Old 10-13-2007, 11:12 AM
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Thanks guys,

I have built a few wheels for 930's, but have a fellow who wants 18's and want to run a 265 in the front. I am pretty sure there is room if I nail the offset right on. We may have to remove the strut dust cover to make it work.

Cheers
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Old 10-13-2007, 01:43 PM
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I currently run 255/35-18 P-Zeros using 9" wheels on the front. No issues at all.
265mm tires would be no problem on 9.5" wheels.


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Old 10-13-2007, 06:10 PM
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Quote:
Originally Posted by Jeff Alton View Post
Thanks guys,

I have built a few wheels for 930's, but have a fellow who wants 18's and want to run a 265 in the front. I am pretty sure there is room if I nail the offset right on. We may have to remove the strut dust cover to make it work.

Cheers
Post them up when you have them done! I am still drooling over the ones you emailed me...I can't decide what I like best now.
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Old 10-13-2007, 07:51 PM
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Rarely, nice pic, the paint is amazing!

Do you know the offset or backpace of your front wheels?

Cheers
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Old 10-13-2007, 09:54 PM
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My car is a widebody '78 SC.
The front wheels are Roock 9x18 built for a 993tt.
Gross width is 10"
Backspacing is 6 7/8"
36mm spacers were used to push the wheel out.

Here is a picture with a 24mm spacer. You can see there is plenty of room for a 265mm tire when you compare it to the above picture using 36mm spacers.

NOTE - tire manufacturers vary considerably in size vs stated width. Pirellis run small.

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Old 10-14-2007, 06:29 AM
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17x10

255 40 17

5.75" Hub to inner wheel lip

0.25" clearance from inner wheel lip to strut dust cover

Rolled fender lip required on one side due to fender variances.
Old 10-14-2007, 07:21 AM
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245 on 9 inch lindseys and 315 on 11 inch in back. I also added a 1 inch spacer to the front . Front fenders are roled. Rims are 17 inch.
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Old 10-15-2007, 05:47 AM
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From 225 to 265 you'll be OK; depending on wheels backspacing from 4" to 6" on 7" to 9" wide wheels respectively, but keep in mind that spacers - up to 1" IMHO are OK.
Old 10-15-2007, 05:56 AM
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you can run a 275 up front
alot of people run this size hoosier on track
17 x 9 with stock flares
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Old 10-15-2007, 06:04 AM
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255/40-17 on 17x9 with the left fender lip rolled.
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Old 10-15-2007, 07:25 AM
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Porsche Crest I Like Them Wide & Tall!

I run 275's up front and 315's in the Rear.
Since I was after a "Vintage-Look" I like the taller side wall.



I would agree 275's up front are the limit for stock flares.
However, you could go quite a bit wider in the rear.

Best of luck....

Paul
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Old 10-15-2007, 07:59 AM
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Quote:
Originally Posted by PAUL RODELO View Post
Since I was after a "Vintage-Look" I like the taller side wall.
If you were after a true vintage look, you'd be running small rims, too. I was at the Sunday morning Calabasas gathering a couple weeks ago. It's a little bit interesting to see some 80's era Ferrari...on 14 inch rims with large aspect ratio tires. Looks tiny (almost cartoony), by modern standards. Though maybe it's today's 22-inch chromed 3-piece spinner rims with encircling black rubber band tires that looks cartoony.

For those of you who have upgraded with wider tires/wheels: how have the handling dynamics changed? Does your car stick better, but to the detriment of road feel or spriteliness of handling? Or is it all positive (except for the financial aspect), with no negatives? On one hand, it's nice to have more "stick." At the same time, at least for street use, I have enough trouble driving at semi-legal limits. The last thing I need are higher cornering speeds.
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Old 10-15-2007, 08:34 AM
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I went from 15s to 18s.

What I experienced when going from 225/255-15 to 255/345-15 was much greater adhesion with a "heavy" feel to the car. It lost some of its tossability.

What I experienced going from 255/345-15 to 255/315-18 was phenominal. The car ran like it was on rails with greater road feel. It fealt "tighter". The lack of 15" sidewall roll is huge!

To compare, the 345/35-15 has a sidewall height of 4.75" and a 24.5" radius.
The 315/30-18 has a sidewall height of 3.72" and a 25.4" radius. HUGE difference.
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Old 10-15-2007, 09:04 AM
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Quote:
Originally Posted by RarlyL8 View Post
My car is a widebody '78 SC.
The front wheels are Roock 9x18 built for a 993tt.
Gross width is 10"
Backspacing is 6 7/8"
36mm spacers were used to push the wheel out.

Here is a picture with a 24mm spacer. You can see there is plenty of room for a 265mm tire when you compare it to the above picture using 36mm spacers.
Did you need longer studs for 36mm front wheel spacers, or did the spacers come with their own staggered studs?
Old 10-17-2007, 06:49 PM
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Thanks guys for all the info, it helps confirm I am building these correctly.

Cheers
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Old 10-17-2007, 07:14 PM
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Ended up with 1.5" adapters (not spacers) which pushed the wheel/tire out just where it needed to be.

This is a picture of a 315/30-18 next to a 345/35-15.
Spacer shown is 2" for rear with the 1" adapter for the front that was too small.

As a side note (that may be worth a data point) before I ran the 255/45-15s on the front I ran a set of 285/40-15s on front. They rubbed on the inner fender well just a bit when lock-to-lock. Took them off 'cause it was a real b!tch to parallel park.



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Old 10-17-2007, 07:32 PM
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