Tire size advice - 215 to 255 (rear) - TCCoA Forums
 
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post #1 of 17 (permalink) Old 01-24-2008, 07:41 AM Thread Starter
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Tire size advice - 215 to 255 (rear)

My 'bird has 215/70/15's at the moment that need replacing. I am on a tight budget, and have found a pair of 255/60/15's which I am thinking about buying and putting on the rears with a pair of 215/70/15's (that I have stored in the garage) on the front.

I know of one other person that has a similar combination on here, and I was wondering what other people thought? The o/d's are approximately the same, but I am a bit worried as to whether the extra width on the rear will affect anything else (ride quality/handling).

"...put me on a highway, show me a sign, and take it to the limit one more time"

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http://www.cardomain.com/ride/2149821

RIP Dutch T-Bird (Robert Hendriks) 1970-2012 No doubt looking down on us from his low-riding T-Bird in the sky.
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post #2 of 17 (permalink) Old 01-24-2008, 08:35 AM
 
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That size will (just) fit on your 6.5" wide wheels... but i'm not sure about clearance issues. The miata tire size calculator shows them to be a little wider then 235/60/16's and nearly identical in height (.1" diff).
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post #3 of 17 (permalink) Old 01-24-2008, 08:51 AM Thread Starter
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94MN1246 has 255's fitted to his car and has a pic in this thread: http://forums.tccoa.com/showthread.php?t=106701. He doesn't mention any clearance issues.

"...put me on a highway, show me a sign, and take it to the limit one more time"

The Eagles
1975

* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
http://www.cardomain.com/ride/2149821

RIP Dutch T-Bird (Robert Hendriks) 1970-2012 No doubt looking down on us from his low-riding T-Bird in the sky.
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post #4 of 17 (permalink) Old 01-24-2008, 08:52 AM
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Generally speaking, the extra rubber on the rear might cause some understeer (front end losing traction first under hard cornering). Depending on your driving style, you may or may not notice that. Upping the front tire pressure a few pounds compared to the front would make it less noticeable.


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post #5 of 17 (permalink) Old 01-24-2008, 09:05 AM
 
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Quote:
Originally Posted by Andy625UK View Post
94MN1246 has 255's fitted to his car and has a pic in this thread: http://forums.tccoa.com/showthread.php?t=106701. He doesn't mention any clearance issues.
I assume you meant to say 94fastbird.
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post #6 of 17 (permalink) Old 01-24-2008, 09:28 AM Thread Starter
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Quote:
Originally Posted by Southpaw View Post
I assume you meant to say 94fastbird.
Yes, sorry! I'd like to see a picture of his car from the rear.

"...put me on a highway, show me a sign, and take it to the limit one more time"

The Eagles
1975

* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
http://www.cardomain.com/ride/2149821

RIP Dutch T-Bird (Robert Hendriks) 1970-2012 No doubt looking down on us from his low-riding T-Bird in the sky.
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post #7 of 17 (permalink) Old 01-24-2008, 11:13 AM
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I was always told that 245's are the biggest you could (safely) go on the stock 15" wheel.

I have used 245/60/15's and they look and drive great.


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post #8 of 17 (permalink) Old 01-24-2008, 11:43 AM
 
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I wondered about that earlier but according to tirerack.com BFGoodrich and Goodyear spec a 6.5" min. / 10" max. rim width for their 255/60/15s. Firestone on the other hand says 7" ~ 9" and Dunlop 7" ~ 10".

All on them base their measurments on a 7.5" width.
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post #9 of 17 (permalink) Old 01-24-2008, 11:51 AM
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i'm gonna try to get some pics of rear this weekend. it at my friends house 50 miles away. getting ready to go in the garage for body work, body kit , paint and wheels. but i'll post some pics with the rear. before i put the news wheels on

Current Mods:
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post #10 of 17 (permalink) Old 01-24-2008, 11:54 AM
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no i dont have any clearance issues, but it did give it a nice stance, theres about 1- 1/1/2 fender well gap i'm thinking. i'll have to go down. i miss my car already. haven't had it for 2/1/2 months cause of snow.

Current Mods:
balanced & blueprinted block. by my dad & I @ (The Engine Shop INC.) i'm running manley forged i beam rods, forged manely .020 16cc dish pistons, forged 8 bolt crankshaft thats been polished, corba high volume oil pump, block has been align bored & decked. ported and polished early production heads, heads have been milled, 3 angle valve grind, ported exhaust manifolds, gasket matched intake, dual inlet dual outlet dynomax turbo muffler underseat with 3inch turndowns. transmission heavy duty clutches, b&m shift kit, frrp t lock with 373.
Future Mods:
pi swap with some comp cams and the new trickflow intake, high stall torque converter and mark 8 drive shaft, kooks 3/4 lenth headers and xcal2
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post #11 of 17 (permalink) Old 01-24-2008, 01:55 PM Thread Starter
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Thanks for the info. Sounds like they're worth a try. The 255's are on Ebay over here at the mo. 215's are slightly harder to get hold of for some reason.

Fastbird, if you do get a chance to post some pics I'd be very grateful.

"...put me on a highway, show me a sign, and take it to the limit one more time"

The Eagles
1975

* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
http://www.cardomain.com/ride/2149821

RIP Dutch T-Bird (Robert Hendriks) 1970-2012 No doubt looking down on us from his low-riding T-Bird in the sky.
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post #12 of 17 (permalink) Old 01-24-2008, 07:45 PM
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I run 255/60-15's on the rear of my 94, with 245/60-15's on the front. Though I run those on 15x7" wheels. IMO, a 255 tire on a 6.5" wheel is pushing it.

Here are a couple older pictures, but you get the idea:





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post #13 of 17 (permalink) Old 01-25-2008, 04:40 AM Thread Starter
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Quote:
Originally Posted by racecougar View Post
I run 255/60-15's on the rear of my 94, with 245/60-15's on the front. Though I run those on 15x7" wheels. IMO, a 255 tire on a 6.5" wheel is pushing it.

Here are a couple older pictures, but you get the idea:





-Rod
Thanks for the pics Rod, with 2nd thoughts I think you're right about them being a bit wide for a 6.5" wheel. I spoke to a tyre shop yesterday who pretty much said the same.

"...put me on a highway, show me a sign, and take it to the limit one more time"

The Eagles
1975

* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
http://www.cardomain.com/ride/2149821

RIP Dutch T-Bird (Robert Hendriks) 1970-2012 No doubt looking down on us from his low-riding T-Bird in the sky.
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post #14 of 17 (permalink) Old 01-25-2008, 05:08 AM
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Go with a 245, Check my Cardomain page for pictures.
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post #15 of 17 (permalink) Old 01-25-2008, 10:39 AM
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Quote:
Originally Posted by Traveler View Post
I was always told that 245's are the biggest you could (safely) go on the stock 15" wheel.

I have used 245/60/15's and they look and drive great.
i agree with traveler.
i have used 245/60/15 for a long time....highly recommend that size on stock tbird fan wheels.

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post #16 of 17 (permalink) Old 01-25-2008, 01:44 PM Thread Starter
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Yeah I think I'll take your advice. Thanks guys.

"...put me on a highway, show me a sign, and take it to the limit one more time"

The Eagles
1975

* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
http://www.cardomain.com/ride/2149821

RIP Dutch T-Bird (Robert Hendriks) 1970-2012 No doubt looking down on us from his low-riding T-Bird in the sky.
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post #17 of 17 (permalink) Old 01-25-2008, 08:02 PM
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235/60/15's here. The picture below was taken before I lowered the car 1.6" with Vogtland springs.

There's a great article HERE that discusses the difference between 235's and 245's

I read this article, specifically the "Changing tire size on stock rims" section, and based my decision to go with the 235/60/15's on it.

If you want to go with the 245's they'll obviously work too. Like racecougar said, a 255 tire on a 6.5" wheel is pushing it.



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