315 front tires on 10.5" wide front wheels - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 24 Old 10-17-2005, 04:13 PM Thread Starter
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315 front tires on 10.5" wide front wheels

has anyone had any luck getting 315's on 10.5" wide rims into the front of a 94-98 mustang?? i know they are doing it in AIX, i was curious if anyone had done it and what it involved.


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post #2 of 24 Old 10-17-2005, 05:59 PM
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A 10.5" wheel is not wide enough for a 315 tire. I'm not saying you can't squeeze one on there, it just won't work as well as a smaller tire that fits the wheel properly. A 12" wheel would be more apprpriate for a 315 tire. There just isn't enough room for a 12" wheel on a Mustang without seriously screwing up the scrub radius.

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post #3 of 24 Old 10-17-2005, 06:47 PM
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post #4 of 24 Old 10-17-2005, 10:58 PM
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Quote:
Originally Posted by Glenn
A 10.5" wheel is not wide enough for a 315 tire. I'm not saying you can't squeeze one on there, it just won't work as well as a smaller tire that fits the wheel properly. A 12" wheel would be more apprpriate for a 315 tire. There just isn't enough room for a 12" wheel on a Mustang without seriously screwing up the scrub radius.
Some 315's are a lot narrowwer than others.
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315 on a 10.5" fits better than a 275 on a 9"... so is a 9" too narrow for a 315 as well?
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DS used 275 710's pinched on an 8" wheel in FS. Should he have used a narrower tire?
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I agree that generally speaking the best wheel for a 315 tire is 12"... but in some cases, it's a different size.
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For the front of a 99+ mustang, a 315 tire needs fender work... and resulting offset needs to be less than 6" or the rubbing on the struts will come in to play... for a wider wheel with a 315, you may be able to get away with a little more... for Coilover clearance, you may need a little less.
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Scrub radius gets screwed up more and more as the width grows... and the added weight needs to be part of the consideration. For an SLA engineered for the wider wheels, and with mondo fenders, it would do well of course.
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My 2 cents...

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post #5 of 24 Old 10-18-2005, 04:31 PM
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Quote:
Originally Posted by racer726
Some 315's are a lot narrowwer than others.
Agreed.
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315 on a 10.5" fits better than a 275 on a 9"... so is a 9" too narrow for a 315 as well?
Not sure what you are getting at, but yes a 315 is too wide for a 9" wheel.
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DS used 275 710's pinched on an 8" wheel in FS. Should he have used a narrower tire?
Yes, he did, but it more than likely wasn't his best choice, however, Kumho was his sponsor and at the time a 275 was the only 17" choice offered in a V710 he could run. Being in FS he was limited to a 8" wheel.
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I agree that generally speaking the best wheel for a 315 tire is 12"... but in some cases, it's a different size.
No argument here!
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post #6 of 24 Old 10-18-2005, 05:57 PM
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Can I fit 315s on my 13" Daytons?
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post #7 of 24 Old 10-18-2005, 07:57 PM
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i have a pic of 315's nitto drag radials on my 17 x 11's which are on the back. i'LL find a picture for you...

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post #8 of 24 Old 10-18-2005, 08:01 PM
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SEE

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post #9 of 24 Old 10-18-2005, 09:46 PM
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He did say on the FRONT of the car did he?

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post #10 of 24 Old 10-18-2005, 11:03 PM
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I'm planning on testing this soon I hope. I have 4 - 315/35/17 V710's on the way and I'm shopping around for another pair of OE Wheel or Wheel Replica brand 95 Cobra R replicas in 17x10.5. The standard 17x10.5 with 27mm offset will not clear the strut without a 1/4" spacer. The tire still comes pretty close and this is with Victoracers. The Victoracer specs call for a 11" wheel and the V710's call for a 12".

I drove mine a little ways down the road with the Victos on front and my street 315 Sumitomos on the rear a while back. I threw it around pretty good with no rub but at lock the tire scrubs on the cross member at the rear pretty bad. I didn't get any fender scrubing. The car is lowered about 1 1/2" and the lower a-frames are set forward 5/16" by offset bushings. The turn in was awesome but with street tires on back it was terrible loose. I can adjust for that if it still that way with stickies on all 4 though.

Nothing definite yet but should know within a month or so and will post back if it does or doesn't work.

Here are a couple of pics of the 315/35/17 Victoracer on 10.5's on front of my 99.




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post #11 of 24 Old 10-18-2005, 11:22 PM
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The 710's may be a good bit wider than the Victos. You gonna bring them out at the SVTOA event at GIR?
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post #12 of 24 Old 10-19-2005, 01:26 AM
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Quote:
Originally Posted by I3oostedCubes
He did say on the FRONT of the car did he?
yes he did- i was just showing him what the sidewall looks like on a 11" wide rim so he can take a better guess on what it will look like on the 10.5" rim.

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post #13 of 24 Old 10-19-2005, 08:35 AM
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Quote:
Originally Posted by Glenn
The 710's may be a good bit wider than the Victos. You gonna bring them out at the SVTOA event at GIR?
Not coming to the SVTOA thing cause I have a local event that weekend. Going to try and make the State Championship event the following week at GIR. If I come up with another pair of wheels before then and it works I'll wear the 315's on front. Otherwise I'll run my 275's on front as usual. I run 315's on the rear anyway and they were needing replacing.

The listed sectional width of the V710 is 13" and the Victo is 12.8" so they are just under 1/4" wider overall. Might be enough to kill the deal. I'm gonna turn out some thicker spacers just in case but I don't want to go over 3/8" without longer studs which I don't intend to do.

Last edited by Han Solo; 10-19-2005 at 08:40 AM.
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post #14 of 24 Old 10-19-2005, 09:48 AM
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Grigg's "Old Blue" fox coupe is now wearing 315's on the front. But it has a SLA and lots of body work. I believe they are running RA1's.

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post #15 of 24 Old 10-20-2005, 10:51 PM
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Thanks to goduke I have the extra wheels ordered so I'll try to take pics and post results on this subject about mid November.
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post #16 of 24 Old 10-29-2005, 08:54 PM
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I'll keep digging this thread back up as I have results to post. Not sure how much difference the 94-98 fit will be compared to my 99 but somone may be interested.

I got the 315/35/17 V710's mounted today and put them on for a test drive. I made a new set of spacers that are slightly over 5/16" thick but I did test fit with the 1/4" spacer and still had clearence. I may use the 1/4" spacers because I was only engaging 12-14 threads on the studs so that is just under 3/4" of thread bearing the load with the 5/16" spacers. 3/8" spacers would be out of the question without longer studs. Obviously the tires aren't the ideal fit on 10 1/2" wheels but I wouldn't want to increase the track any wider. They stick out a bit in front but clear fine until you get to lock. We all know where the 275's hit so the 315's just hit the same area that much sooner.

Driving impressions are I didn't notice as much extra turn in response as I did with the victo's on front with street tires on rear but it still feels like it turns in better than with 275's. You can feel the extra weight in the steering but it's not that bad. I did not notice any change in acceleration rate but that is probably because I already run these monsters on the rear. I did some simulated slalom runs on a stretch of country highway near my house. I didn't have any cones to set up so I'm not sure of what distances I was able to achieve but I changed lanes abruptly on a couple of 40 mph runs then some at 50. I was mainly trying to get one end or the other to break loose and never did. I didn't have any place to safely simulate a turn around. I will get to run the setup next week but it will be on a surface that has loose gravel and sand so it won't be a great test of capability. The week after that I am going to try to do the FL Championship event in Gainesville so I'll probably wait till after that to update my impressions. Final analysis so far: I NEED A BETTER SEAT. LOL




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post #17 of 24 Old 10-29-2005, 10:27 PM
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Good you keep bumping/updating H.Solo. I'm pretty much done doing autox this season, so I'm going to use the down time to accumulate the money needed to get an extr set of 17x11's(AR TT II's that I already have)and mount up the same tire you have.

From the looks of those pics, it seems that the 315 on the 10.5" isn't really THAT much of a bulge, nothing I'd be too concerned with anyways.

It may be some time before I get the wheels/tires due to not needing them for 4 or 5 months, but I'll add my impressions as well. Realistically I plan to have the 315's on all 4 corners, stiffer springs, and more camber for next seasons "assault".

I thought real hard about the addition of the KenneBell blower for my car, but have chosen to purchase a forged/high compression short block instead. I figure a big bore/stroker motor will offer me enough torque and hp, while at the same time be an upgraded piece for the 200shot I plan to pour on it.

The wheels, tires, springs, camber plates will most likely be my budget(next season)so the motor will most likely wait untill this motor is "on it's way out".

Good luck man!!!! If 275's on all corners work good............more is better, right?!
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post #18 of 24 Old 10-30-2005, 01:48 PM
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Quote:
Originally Posted by Han Solo
I'll keep digging this thread back up as I have results to post. Not sure how much difference the 94-98 fit will be compared to my 99 but somone may be interested.

I got the 315/35/17 V710's mounted today and put them on for a test drive. I made a new set of spacers that are slightly over 5/16" thick but I did test fit with the 1/4" spacer and still had clearence. I may use the 1/4" spacers because I was only engaging 12-14 threads on the studs so that is just under 3/4" of thread bearing the load with the 5/16" spacers. 3/8" spacers would be out of the question without longer studs. Obviously the tires aren't the ideal fit on 10 1/2" wheels but I wouldn't want to increase the track any wider. They stick out a bit in front but clear fine until you get to lock. We all know where the 275's hit so the 315's just hit the same area that much sooner.
Interesting. When I trial fit 10 1/2" rims (with 285 tires) to the front of my '97 with 1/4" spacers, the tire hit the sway bar at one side of full lock and the wheel hit the back side of the lca on the other. I had maybe 1/8" clearance between the wheel/tire assembly and the struy - not enough in my book.

So, I bought new hubs (75,000 miles, so why not?), wider spacers for the steering rack, longer studs and 1/2" spacers. Not on yet, but it looks like my 315s will stick out a bit more than yours. I also rolled the fenders, not sure that was needed, but I had a chance to borrow the tool so I went ahead.

I have heard '99+ front lcas have more clearance.

What is your clearance at the strut with 1/4" spacers?

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post #19 of 24 Old 10-30-2005, 01:53 PM
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The 99>'s must have more clearance. Like stated before, I trial fitted AR TT II's(17x11's) with Nitto 315 drags on them to the front, they fit good with a small spacer added to clear the strut. It was still close to the strut, but only on full suspension droop. My current tires (275's on 9's for autox and 275's on 9.5's for street)hit on the bend of the front swaybar, and on the back rolled edge of the K-member. Nothing sharp, but it only contacts on FULL steering lock.
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post #20 of 24 Old 10-31-2005, 07:35 AM
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I've got a set of cheapo 315/35 Sumitomos in the back on 10.5" wheels. The tire only bulges out a millimeter or two past the outside lip of the wheel. I wouldn't say that was excessive.

Haven't tried fitting them in front; I have 9" wheels in front.
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post #21 of 24 Old 11-03-2005, 10:03 PM
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To all interested,

Both my brother and I run a generic 17 X 10.5's Cobra R style rim. We used 7/16 spacers at all four corners, 3" wheel studs, and 2 "white" steering limiters (which I think are 1/4") in addition to the "green" ones (which I think are 1/8") that are already in there from the factory. Oh, and NO fender work. None. I have run 275's(on real Cobra R's) in the front, and 3have had them hit both the LCA's and my Steeda sway bar (without the limters.)

My brother and I needed the 7/16" spacer, and use steering limiters to keep it off the LCA and the sway bar with the 10.5 rims and 315 tires. And yes, you have to have studs to do this with these style rims. The fenders have not been an issue. The rubbing we have seen has been inner fender on both front and rear, and will rub on the tail pipes(both my car and my borther's are sans tail pipes b/c of the 5-links.) Nothing too terrible, but we have used a BFH on the rear inner fender to get more room.

Yes, ideally, I think 315's would work better on a wider rim. We are using a pyrometer to measure tire temps to get the in the right range for air pressure. We have not seen any abnormal wear on the tires. No bad rollover, and consistent wear across the tire. The C/C plates up fron help alot, too.

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post #22 of 24 Old 11-06-2005, 08:58 PM
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I think this test has come to an indecisive end for the time being. I ran the first event on them today on our normal site that has rough asphalt. I won SM class by 1.623 seconds over 2nd place but of the two guys that usually finish 2nd and 3rd, 1 was not there and the other had trouble with his usual ride and ran his wife's street car.

The V710's I had were purchased used from a guy off the SCCA Forums and turned out to be a burn. They were described as just having 1 auto-x on them and just barely scuffed. When I received them 2 of the tires looked as described and the other 2 looked like he had been doing burnout's on them. 1 even had signs of sectional separation. At the end of the day the worst looking tire had come apart and 2 of the others were showing signs of separation. I'm not sure he didn't pawn off some pre-recall tires on me but I've sent him an email to see if he will make good.

At this point I don't have a full set of 315's to continue testing and no funds to buy another set.

If I get back to this later and have any further results to post I'll dig it back up.
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post #23 of 24 Old 11-06-2005, 09:39 PM
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Not only did Dave Schotz run the 275s on an 8 inch RIM he recommends that you do FOR AUTOX. HPDEs and Road Racing that type of thing is a no no.


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post #24 of 24 Old 11-07-2005, 04:56 AM
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Quote:
Originally Posted by Han Solo
If I get back to this later and have any further results to post I'll dig it back up.
Misleading someone sucks!!! Hope you get it all worked out man. I'm still saving for new'unz just for this very reason.
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