Tire Size for 17" wheels on Shelby Z

[Reeves]

Looking for the tallest/widest tire I can fit on a G body with 17" wheels. 17" x 8" x 35mm offset

I know I have fit a 245/50/15 BFGoodrich Pro-Comp on a stock Shelby Z with just a little hammer work on the inner wheel wells in the back. They looked awesome. I'm looking for something similar to that on this car.

[contraption22]

A 245/40/17 will be the same exact theoretical height, and of course width, as a 245/50/15.

The only unknown will is the offset or backspacing of the OE 6.5" crabs. If they are 35mm offset, or 5.1" backspacing, you will have the same exact clearances with the new wheels.

[contraption22]

Bump! Anybody know the offset of the 6.5 crabs?

[Pat]

bump! Anybody know the offset of the 6.5 crabs?

707!!!

[GLHNSLHT2]

40mm last I checked

[contraption22]

707!!!

LOL! OMG!


40mm last I checked

Thank you sir.

Looks like you will have 5mm less space on the inside, give or take, James.

[minigts]

My concern would be on the outside. The issue I've run into on the rears was the fender lip. Granted, I have different spindles on mine, but even up front unless I ran at least -1.25 camber, it would hit the top of the inner fender and unless I ran -1.5-2 camber, it hits the plastic fender shield.

[contraption22]

My concern would be on the outside. The issue I've run into on the rears was the fender lip. Granted, I have different spindles on mine, but even up front unless I ran at least -1.25 camber, it would hit the top of the inner fender and unless I ran -1.5-2 camber, it hits the plastic fender shield.

James' car is a G-body.

[minigts]

Well I understand the car is wider, but does that mean additional wheel well room or just additional width between frame rails? I don't work on the G bodies a lot, but I'd still want to see the clearance of any 8" rim on the car. That's pretty awesome if they have enough room to sport a 245! The only way I'll ever get that on my GLHS is if I flare the fenders and cut some stuff out. :p

[Dr. Johny Dodge]

G's are fatter in every way

a 225 might be tight on an L body but not so much on a G body

& remember the 245 is less than an inch wider than a 225 .. if there's still 25mm in an inch

- it's still a tight fit down at the bottom of the driver's side of the firewall / wheel well when you turn full lock to the left

a 215 60 15 JUST kisses the front edge of the passenger side wheel well where the plastic nose ends at the point where it's pinned to the edge of the wheel opening - but it won't rub the paint off

passenger side wheels are slightly further forward in the wheel opening than the driver's side in every fwd mopar I've ever looked at or had

if a 225 fits a 6.5 inch rim right so the 8 inch wheel might be a bit wide for the 245

- an inch and a half more wheel width than the stock wheel vs appx 3/4 inch more tire

[contraption22]

if a 225 fits a 6.5 inch rim right so the 8 inch wheel might be a bit wide for the 245


BFG recommends 8" to 9.5" rim width for the 245/40r17

[Dr. Johny Dodge]

is that with the new style wheels that stick out past the tire at the rim edge ?

a 9.5 on a 245 is nuts
I had 295's on 10's on my truck - that put the rim edge in line with the tread edge (bfg's) with normal looking sidewall bulge

and now that I think of it , 245's on 7's on the front that also looked right as far as the sidewalls go

[Force Fed Mopar]

I once bolted a 17x10 w/ 35mm offset wheel on the Lebaron, I forget the tire size though. It cleared through the turning radius, except at full lock, but it stuck out past the fender an inch at least.

[contraption22]

is that with the new style wheels that stick out past the tire at the rim edge ?

a 9.5 on a 245 is nuts
I had 295's on 10's on my truck - that put the rim edge in line with the tread edge (bfg's) with normal looking sidewall bulge

and now that I think of it , 245's on 7's on the front that also looked right as far as the sidewalls go

A tire mfr would never recommend a stretched figment, so no.

I have 225/45r17's on my SRT-4 with a 17x7 wheel, and the tire is actually a bit fat for the wheel. An 8" wheel would have worked a bit better without looking stretched.

Remember that the first number in a metric tire size is the section width, not the tread width. And as your sidewall height decreases (determined by the aspect ratio of the tire, which is the second set of numbers in a p-metric tire size, as a percentage of section width) the tread width is going to be closer to the section width. That's why you can go with a wider section tire for a 60, 70 or 75 series tire than a lower profile tire like a 45, 40, or 35.

[contraption22]

http://images.tapatalk-cdn.com/15/11/21/6a801c335d712f2fec69dbf1341f5613.jpg

[Reeves]

Brad Morris (morrispower) was home today so I text him and he measured up a 6.5" crab and got 5.375" backspacing.

[contraption22]

Brad Morris (morrispower) was home today so I text him and he measured up a 6.5" crab and got 5.375" backspacing.

That confirms the 40mm offset.

[Reeves]

Looks like you will have 5mm less space on the inside, give or take, James.

Looking at your attached image above, it looks as if the 245/40/17 is a dang good fit eh? Is that what you are concluding as well?

[contraption22]

It seems big to me. But it is close in comparison to the 245/50/15 you tried

[Reeves]

It seems big to me.

Thanks Mike!

[Turbo3Iroc]

I have 245/40/17 on a 17x8 with a +35 offset on my R/T. I know there is some difference in the undercarriage but I think the end locations are similar. I only get minor rubbing on a partial turn on the back of the front wheel opening. HTH

[Reeves]

Any pictures Kelly?

[Reeves]

Any advice on Nexen tires?

http://smile.amazon.com/gp/product/B00QSGDOF8?psc=1&redirect=true&ref_=ox_sc_act_title_1&smid=ATVPDKIKX0DER

I see that Tire Rack has the Goodyear Eagle F1 on sale, but at the above price, and look, I'm tempted to get these. These are going on my Dad's Shelby Z, tire wear is no issue, they will surely dry rot before they wear out.

[GLHNSLHT2]

Mike is there a URL for that tire/wheel sizing program you are using??

[Turbo3Iroc]

I'll look but I may have to roll it out and take some.

I use this one: http://www.dakota-truck.net/TIRECALC/tirecalc.html

[contraption22]

Mike is there a URL for that tire/wheel sizing program you are using??

Here you go.

http://www.rimsntires.com/specspro.jsp

[91DSX]

I'm also running a 245/40/17 BFG KDW tire on a 17x8 +35mm offset, 91 Daytona FYI
Will rub ever so slightly on full lock

[Reeves]

Pics?

[Vigo]

I've had 245/40/17 on 17x8 + 35 on my Dynasty for the past... 9 years! :0

I also have 245/40/18s on 18x8 on two other cars. 245/40 and 8" wheels are a perfect match.

Ive never tried any of it on a daytona. I know it doesn't work on my Aries or Spirit due to differences in the fenderwells. The dynasty has big (1"+) flares from the factory.

[iTurbo]

I have a 17x7 wheel, 35mm offset on my Shelby Lancer with 215/45 and they fit perfectly. Hope this is of some help to somebody someday.

[Dr. Johny Dodge]

Any advice on Nexen tires?

http://smile.amazon.com/gp/product/B00QSGDOF8?psc=1&redirect=true&ref_=ox_sc_act_title_1&smid=ATVPDKIKX0DER

I see that Tire Rack has the Goodyear Eagle F1 on sale, but at the above price, and look, I'm tempted to get these. These are going on my Dad's Shelby Z, tire wear is no issue, they will surely dry rot before they wear out.

goodyear f1's .. ?
do some homework , I believe there's a couple of versions of the f1's and they're temperature sensitive , meaning no grip whenm it BEGINS to get cool out .. and none when it is really genuinely cold out
a buddy has them on a 12 shelby , granted it's 500 +_+ hp but the tires start getting suckie at 50*

[iTurbo]

I had Goodyear Eagle F1 tires on my Caliber SRT-4 (OEM). They were the "Supercar" version though, which I'm not sure are made any more. I really liked them and got over 42k miles out of them.

[contraption22]

goodyear f1's .. ?
do some homework , I believe there's a couple of versions of the f1's and they're temperature sensitive , meaning no grip whenm it BEGINS to get cool out .. and none when it is really genuinely cold out
a buddy has them on a 12 shelby , granted it's 500 +_+ hp but the tires start getting suckie at 50*

That's pretty much true of any true summer tire. It's not just snow that makes them unsafe, but the compound loses grip in cold temperatures, even in the dryest of conditions.

[Reaper1]

225/50/16 on RPF1's, 35mm offset on my '88 Shelby Z has a SLIGHT inner wheel well lip issue in the back on both sides (yes, the axle is centered). The fronts clear everything except full lock they will *slightly* rub either the splash liner or the very lower back part of the well.

I can totally attest to summer tires NOT working in "chilly" AT ALL!!

[91DSX]

Finally upgraded my account to add pics!
http://www.turbo-mopar.com/forums/photopost/data/500/medium/IMG_20151012_213338.jpg
http://www.turbo-mopar.com/forums/photopost/data/500/medium/IMG_20151012_213223.jpg

[GLHNSLHT2]

with wider tires how much negative camber are you guys running? My 205's are close on stock crabs but then I have -1.5 degrees dialed into the front end.

Mike, thanks for the URL!

[Reaper1]

On my Shelby Z I have chamber plates, So I have the tech pull the strut all the way out (factory position), 0* camber the tire which gives good clearance to the strut, then use the plates to adjust to -1.5 for street, -2 for track if I feel like actually changing it because the toe must be changed as well.

Before I had the plates I couldn't get my pinky between the tire and the strut at -1.5.

In the rear it's no more than -1.

[GLHNSLHT2]

And that's what I'm thinking I'd have to do Reaper, and I assume that's the way you would do it as well being you. Just curious what the majority is doing. What width rim are you running?

I'd like a 245 but think I might stick to a 225.

[Reaper1]

Enkie RPF1 16x7, +35mm
Currently I have Kumho XS 225/50/16 tires on them (now mounted on the 8V TC! :P And they look MEAN!)

In all honesty I *wanted* to do 17x8, but in order to pull it off the way I wanted I needed camber plates, but they weren't installed yet. Plus there was some reason that you have to run 3mm spacers on one end of the car, plus roll the fenders. I might still have that conversation saved someplace, but it was between Chris Still and myself back around 2008. Now, I can only say that those things needed done to *my* setup to accomplish what I was after, so obviously it probably can be done other ways. I was going to run 245/45/17's IIRC.

[MoparStephen]

Finally upgraded my account to add pics!
http://www.turbo-mopar.com/forums/photopost/data/500/medium/IMG_20151012_213338.jpg
http://www.turbo-mopar.com/forums/photopost/data/500/medium/IMG_20151012_213223.jpg

Nice looking ride. Do you know the backspacing on those rims? I'm looking for a similar size rim&tire for my 87 Shelby Z.