255/40 vs 275/35 Nitto NT05 - Mustang Evolution

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Old 05-14-2015, 07:07 AM   #1
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255/40 vs 275/35 Nitto NT05

Want better stick for my Track Pack GT. Mods are CAI, Catback, Tune, springs, upper and lowers, panhard, relos, MGW

I take mine to the strip maybe once per year. Might do a CJ or Boss eventually but with the NT05 I mostly do street driving and put 3.5k on the ODO per year so she only sees nice weather.

Reason I'm asking is because I have the 19" Brembo rims OE. With the 35 I would lose about half inch on diameter.

I know jack about wheel setups

Will the small loss in dia effect me much going with the 275 or keep the slightly taller 40 on a 255. Needs more stick without heating them up in case I need it.

Thoughts?

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Old 05-14-2015, 07:54 AM   #2
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If I remember correctly, if you start to dip under the stock diameter 27", then it begins to effect your gear ratio. So if you have 3.73s and you go to a 275/35-19 from a 255/40-19 your ratio will drop from 3.73 to 3.67...but that's about the only negative.

You could go with a 275/40-19 and that would put you a little over 27" diameter, and that would also raise your gear ratio to 3.82. A lot of people like the look of the slightly larger tires on the mustang for looks and better grip from a larger sidewall.
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Old 05-14-2015, 08:54 AM   #3
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Quote:
Originally Posted by whitboy82 View Post
If I remember correctly, if you start to dip under the stock diameter 27", then it begins to effect your gear ratio. So if you have 3.73s and you go to a 275/35-19 from a 255/40-19 your ratio will drop from 3.73 to 3.67...but that's about the only negative.

You could go with a 275/40-19 and that would put you a little over 27" diameter, and that would also raise your gear ratio to 3.82. A lot of people like the look of the slightly larger tires on the mustang for looks and better grip from a larger sidewall.
I think you have the effects of smaller dia tires backwards. Smaller dia increases the gear ratio. Double check your source.
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Old 05-14-2015, 09:13 AM   #4
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Yeah, looks like I had it backwards
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Old 05-14-2015, 09:47 AM   #5
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Hmmm. Nitto doesn't make a 275/40/19 for the NT05.

Would there be much of a hook difference between 255/275 seeing that they are drag radials?

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Old 05-14-2015, 12:35 PM   #6
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I run the 275/40/19 BFG Sport Comp 2's on my GT with 3.73 gears, 9.5 inch SVT rims and really like them on the track. Right now those are just in the back - the fronts are 255's, which I plan on replacing with 275's to square it up when I wear them out.
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Old 05-14-2015, 12:39 PM   #7
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The nt05 is not a drag radial.
The nt05r is the drag radial.


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Old 05-14-2015, 01:05 PM   #8
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Originally Posted by Rapinator126 View Post
The nt05 is not a drag radial.
The nt05r is the drag radial.


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You're right - I forgot he said 'strip' - my BFG's aren't drag radials either.
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Old 05-15-2015, 05:20 AM   #9
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My bad I did mean the r

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