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  Mustangsandmore Forum Archive
  '69 to '73 -- The Musclecar Mustang
  tire size again..... :)

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Author Topic:   tire size again..... :)
kewljay223
Gearhead

Posts: 473
From: Long Beach, California
Registered: Sep 2002

posted 10-28-2006 01:38 PM     Click Here to See the Profile for kewljay223        Reply w/Quote
hey guys, i know this is asked all the time but i couldnt find anything in the archives that answered my question. i have the torque thrust D's right now on my 69. 15x7 with 205/65/15 in front and 15x8.5 with 225x60/15 in back. looks great and all but man i have no hook up whatsoever! if i punch it in first or second gear at all, i might as well be hydroplaning. i dont have posi either. i will be getting that new stroker in the near future so thats just gonna make this worse. i am planning on gettin 3.55's or 3.73's and installing a trac loc along with the new engine. so i am going to need some new rubber also.

i have 8.5" rims in the back so i can stick a good amount on there. i was wondering if it was possible to get 245 or 255 on them. i dont want slicks or anything that look like them. im not going for that kinda look. i would just like some meat back there to grab the floor when needed. thanks.

SteveLaRiviere
Administrator

Posts: 48752
From: Saco, Maine
Registered: May 99

posted 10-28-2006 04:37 PM     Click Here to See the Profile for SteveLaRiviere        Reply w/Quote
I'm putting 255s on the back of mine, I believe Ray {7DMach1} runs 275s on the back of his and says he thinks he could have run 295s.

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'70 Mustang Mach 1 - '70 Mustang Convertible - '72 Mustang Sprint - '94 F-150 XL

kewljay223
Gearhead

Posts: 473
From: Long Beach, California
Registered: Sep 2002

posted 10-28-2006 06:10 PM     Click Here to See the Profile for kewljay223        Reply w/Quote
what is your percentage number? the middle one?

SteveLaRiviere
Administrator

Posts: 48752
From: Saco, Maine
Registered: May 99

posted 10-28-2006 08:39 PM     Click Here to See the Profile for SteveLaRiviere        Reply w/Quote
You mean my aspect ratio? I'm using 60 series, so is Ray.

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'70 Mustang Mach 1 - '70 Mustang Convertible - '72 Mustang Sprint - '94 F-150 XL

kewljay223
Gearhead

Posts: 473
From: Long Beach, California
Registered: Sep 2002

posted 10-29-2006 03:02 PM     Click Here to See the Profile for kewljay223        Reply w/Quote
yes thanks. where is a good place to look for a decent selection and price? summit?

SteveLaRiviere
Administrator

Posts: 48752
From: Saco, Maine
Registered: May 99

posted 10-31-2006 12:07 PM     Click Here to See the Profile for SteveLaRiviere        Reply w/Quote
Yes, actually it seems like Summit beats the heck out of everyone's prices as far as I've seen. I think they sell the BF Goodrichs for around $82, locally they want $115 here. You just need to get them mounted locally.

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'70 Mustang Mach 1 - '70 Mustang Convertible - '72 Mustang Sprint - '94 F-150 XL

Hemikiller
Gearhead

Posts: 726
From: Killingworth, CT
Registered: Feb 2002

posted 10-31-2006 05:38 PM     Click Here to See the Profile for Hemikiller        Reply w/Quote
www.tirerack.com has even better tire prices than Summit, plus a much wider selection.

SteveLaRiviere
Administrator

Posts: 48752
From: Saco, Maine
Registered: May 99

posted 10-31-2006 06:10 PM     Click Here to See the Profile for SteveLaRiviere        Reply w/Quote
You are right, they show $72 for the 255/60-15

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'70 Mustang Mach 1 - '70 Mustang Convertible - '72 Mustang Sprint - '94 F-150 XL

kewljay223
Gearhead

Posts: 473
From: Long Beach, California
Registered: Sep 2002

posted 10-31-2006 07:12 PM     Click Here to See the Profile for kewljay223        Reply w/Quote
ok. thanks for the pointers. ill be lookin around. but i do have a question for steve. what size backspace does he have on the rim to fit those things on there? im not sure what mine is but i can find out because i would consider going that wide. also, does he have rolled fenders or a huge bump stop to prevent rubbing on the body? mine is for street and occasional strip use so i dont know if i could fit that wide of a tire on mine since i dont have rolled fenders.

SteveLaRiviere
Administrator

Posts: 48752
From: Saco, Maine
Registered: May 99

posted 10-31-2006 07:27 PM     Click Here to See the Profile for SteveLaRiviere        Reply w/Quote
In the back I have 15x8 Magnums with 4.25" backspacing. No modification to the body. I mounted the wheel on and there's plenty of room for 255s. I could probably go 275s but I don't want to be close to the closest interference point, which is the front of the inner wheelwells.

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'70 Mustang Mach 1 - '70 Mustang Convertible - '72 Mustang Sprint - '94 F-150 XL

kewljay223
Gearhead

Posts: 473
From: Long Beach, California
Registered: Sep 2002

posted 11-03-2006 06:32 PM     Click Here to See the Profile for kewljay223        Reply w/Quote
so i found out that my backspace on my 8.5" rim is 3 3/4. thats a 1/2" further from the inner wheel well than yours steve. right? i should be able to go with the 255 and possibly the 275's since i have more space back there.... im intersted in the 275 route if that is possible. should i be able to tell by getting under the car and measuring what i have now (tire to wheel well) and detucting the added width of the new tire? 275 is 11" right? and my 225 is only 9" that would make the 275 somewhere in the range of 1.5" closer to the inner wheel well....... does that make sensel? am i calculating this right here? seems like i should be able to do this.

but now since my rims are further outward, should i be concerned with the body?

SteveLaRiviere
Administrator

Posts: 48752
From: Saco, Maine
Registered: May 99

posted 11-04-2006 08:13 PM     Click Here to See the Profile for SteveLaRiviere        Reply w/Quote
What I did was mount the bare wheel and measured the rim edge to the obstuctions. Then you can take the section width of the tire you are thinking of running then calculate how much clearance you have. Be sure to allow for suspension travel.

Here's a chart you'll find handy:

http://www.dodgestang.com/Tire%20Fitment%20Guide%2069-70.pdf

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'70 Mustang Mach 1 - '70 Mustang Convertible - '72 Mustang Sprint - '94 F-150 XL

kewljay223
Gearhead

Posts: 473
From: Long Beach, California
Registered: Sep 2002

posted 11-15-2006 09:17 PM     Click Here to See the Profile for kewljay223        Reply w/Quote
hey, i just wanted to thank you all for the replies. sure helped me out. i went ahead and bought the BFG radials @ 275/50/15. they fit perfect and look awesome. so hopefully this can help someone else too. and it does look like i could fit 295's if i so desired thanks again everyone!

SteveLaRiviere
Administrator

Posts: 48752
From: Saco, Maine
Registered: May 99

posted 11-16-2006 05:58 PM     Click Here to See the Profile for SteveLaRiviere        Reply w/Quote
That is cool, Jay. You have a '69 right? I bet it looks real meaty with those 275s.

I was looking at a Mustang Monthly from a few months ago and there was a '70 R code Mach with 275/60-15 on the back and they looked great.

Now I'm tempted to try 275s. I should swipe the ones off my truck and mount them...

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'70 Mustang Mach 1 - '70 Mustang Convertible - '72 Mustang Sprint - '94 F-150 XL

kewljay223
Gearhead

Posts: 473
From: Long Beach, California
Registered: Sep 2002

posted 11-16-2006 08:46 PM     Click Here to See the Profile for kewljay223        Reply w/Quote
yeah steve. it is a 69. and a mach!! but i have some bad news.... i just found out today that i can hit any hard dips or else it hits my fenders!! there is plenty of space on the inside but it hits on the outside. i think its because my backspace is so little that it sticks out further. my backspace is 3.75 and that could be why.

but yes, they look very cool and makes the car look "BUFF" lol i think i am going to keep them on there and just take it easy. they sure do hook up WAY better than the puny 225's i had on there!!!

SteveLaRiviere
Administrator

Posts: 48752
From: Saco, Maine
Registered: May 99

posted 11-17-2006 07:07 PM     Click Here to See the Profile for SteveLaRiviere        Reply w/Quote
Bummer! You could roll the quarters and get a little room, if you're so inclined. I wouldn't do it, but some folks don't mind. I did it to my '72 many years ago.

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'70 Mustang Mach 1 - '70 Mustang Convertible - '72 Mustang Sprint - '94 F-150 XL

kewljay223
Gearhead

Posts: 473
From: Long Beach, California
Registered: Sep 2002

posted 11-17-2006 08:36 PM     Click Here to See the Profile for kewljay223        Reply w/Quote
well i already got a fresh paint job that cost a pretty penny. so i dont want to ruin that. and second, i personally dont like the look of the rolled fenders. i mean its ok but i dont want it on my car. oh well. gotta deal with it. lol

SteveLaRiviere
Administrator

Posts: 48752
From: Saco, Maine
Registered: May 99

posted 11-18-2006 03:12 PM     Click Here to See the Profile for SteveLaRiviere        Reply w/Quote
I don't blame you there, I wouldn't risk the new paint either. The rolling I'm talking about isn't visable from the outside. On my '72 I used a baseball bat and rolled the inside lip in, if you didn't have another '72 next to it to compare, you'd never know I did it. In fact, it looks more 'factory' than factory, I think. But again, I wouldn't risk new paint either.

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'70 Mustang Mach 1 - '70 Mustang Convertible - '72 Mustang Sprint - '94 F-150 XL

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