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2011-2014 V6 Mustang Tech Forum

2011-2014 Talk | 2011-2014 GT | 2011-2014 V6 | 2005-2010 Talk | 2005-2010 GT | 2005-2010 V6 | Shelby GT500 | Mustang Tech 
 

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Unread 04-08-2013   #1 (permalink)
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Default smaller diameter tires pros and cons?

Will I benefit from getting a smaller diameter tire I heard it is like changing gears?

Also what is to small my stocks according to tirerack is 28"
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Unread 04-08-2013   #2 (permalink)
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I dont think your stock tires will be 28" closer to 27" and if you go smaller in diameter than that, it wil look funny IMO.
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Unread 04-08-2013   #3 (permalink)
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P215/65R17 michelin energy saver a/s 28"

Michelin*Energy Saver A/S

of course fender gap will be ugly but im thinking performance you don't feel aesthetics on your car.
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Unread 04-08-2013   #4 (permalink)
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you'll get a small gearing increase, your speedo will be off a little, gas mileage may go down a little.

Depends on what size you're looking at but I went from my stock 225/60/17's to 275/40/18's and love the change (27.6" to 26.7"). I still have 2.73's out back though so every little bit helps. Its a 3.5% difference with those numbers so probably not worth it just based on that. Go a lot wider and it is
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Quote:
Originally Posted by rustang3232 View Post
P215/65R17 michelin energy saver a/s 28"

Michelin*Energy Saver A/S

of course fender gap will be ugly but im thinking performance you don't feel aesthetics on your car.
I don't understand putting 3.73 gears on your car, then thinking about putting thin fuel savings tires on. Huge oxymoron that is.
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those are my stock tires i was looking at alot of tires at like 26" lmao no way i will buy those unless i really can not afford better.
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Unread 04-08-2013   #7 (permalink)
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I have a smaller tire diameter than stock. I don't think it looks weird, and I do notice the increased gearings. It's about 400 rpms higher in every situation with the tires. 40 mph 2nd gear with stock tires id be at 3600 rpm. with my shorter than stock tires im at 4100 rpm or so. And on the upshifts I'm over 5k at every upshift which is also good for power. I like em alot
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do you know over all diameter? maybe also post a pic up?
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Unread 04-08-2013   #9 (permalink)
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Yea my overall diameter is 26.8 inches. They're 245 45 18 size.


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235 55 r17 is a very good choice for the 17x7 rims.
245 45 r18 is a good size for 18x8 rims. Mostly because higher performing rubber is available in those sizes.
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Quote:
Originally Posted by powerwhee View Post
Yea my overall diameter is 26.8 inches. They're 245 45 18 size.
I have a similar size 255x45x18, and like em'. They have good grip, don't rub at all, and I can rotate em'.
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Quote:
Originally Posted by vivix View Post
you'll get a small gearing increase, your speedo will be off a little, gas mileage may go down a little.

Depends on what size you're looking at but I went from my stock 225/60/17's to 275/40/18's and love the change (27.6" to 26.7"). I still have 2.73's out back though so every little bit helps. Its a 3.5% difference with those numbers so probably not worth it just based on that. Go a lot wider and it is
Actually, depending on the weight of the new setup, you could be getting better gas mileage. Dropping rotational mass increases fuel efficiency, which is usually a bit offset by change in gears, so it normally evens out unless you have an unusually high % reduction in weight.

However, it doesn't change the final gear by much. I reduced the diameter of my OE wheels by 2.5" and is the equivalent of going from 3.31 final drive to 3.49. Figured out by cross multiplication table of circumference.

A/B = X/Y

A = OE Tire Circumference
B = OE Final Drive Ratio
X = New Tire Circumference
Y = New Final Drive Ratio (unknown value)

Tire Circumference = pi x tire diameter

Takes a big reduction in diameter to get a little change in final drive ratio.
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Unread 04-08-2013   #13 (permalink)
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Yea it's not a huge chang, maybe 300-400 Rpms, but its enough to put the car in the powervand a lot nicer when mashing it from 40 mph and when up shifting gears


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Unread 04-08-2013   #14 (permalink)
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I changed my stock rims and tires (energi-savers) to the GT500 rims and sumitomo tires (255/45/18 front and 275/40/18 rear). at 75 mph your engine rpm is only going to go up about 100rpm (2208rpm to 2315rpm for the autos). I did notice a 1 mpg loss according to the computer, but the computer isn't completely accurate so its hard to say. I did notice however slightly better acceleration and a lot better traction over the stock tires.
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Unread 04-08-2013   #15 (permalink)
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Also, there will be more wheel gap (espically in the rear) so I am definitely planning on lowering my car in the future. For now its bearable enough to live with, as the new rims and tires look 1000 times better.
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