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Old 06-15-2010, 05:32 PM   #1
haertig
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Default Tires: ? 255/70R17 vs. 265/70R17 ?

Our F150 came with the 255's. *Local store would have to order those, but has 265's in stock they'd give us at the same price (sales guy said they'd fit on the same rim).

What are the benefits or problems with the slightly larger tire? *Speedometer errors? *Gas mileage decrease?

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Old 06-15-2010, 06:27 PM   #2
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Default Re: Tires: ? 255/70R17 vs. 265/70R17 ?

Spedo error: check.
I would think you may get SLIGHTLY better mileage with the larger rubber: Taller effective gear ratio.

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Old 06-15-2010, 07:30 PM   #3
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Default Re: Tires: ? 255/70R17 vs. 265/70R17 ?

the 255 calcs to 31.1" dia
the 265 calcs to 31.6 dia
thus a 1.7% differance so at 70mph you will be about 69

about the same change as thread wear and air pressure *:-/

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Old 06-15-2010, 10:08 PM   #4
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Default Re: Tires: ? 255/70R17 vs. 265/70R17 ?

And only 1/2" wider shoulder to shoulder, so no problem with your rims.

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Old 06-15-2010, 10:34 PM   #5
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Default Re: Tires: ? 255/70R17 vs. 265/70R17 ?

We went with the 265's that they had in stock. *They just called to say they are mounted and to come pick up the truck.

We went for Bridgestone Dueler A/T Revo 2's. *These tires seemed to have consistantly high ratings at several websites we researched. *Since the local shop didn't have the 255's in stock, they gave us the 265's at the 255 price of $150 each. *Not too bad for a decent tire in this size. *Cheaper than online places even. A tire for mostly road, but need snow performance and light offroad mud on occassion.

http://www.tirerack.com/tires/BigPic.jsp?sidewall=Outlined+White+Letters&tir eMake=Bridgestone&tireModel=Dueler+A%2FT+Revo+ 2

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Old 06-15-2010, 10:37 PM   #6
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Default Re: Tires: ? 255/70R17 vs. 265/70R17 ?

a stock photo doesn't cut it.....

lets see them with some mud on them

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Old 06-16-2010, 05:21 AM   #7
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Default Re: Tires: ? 255/70R17 vs. 265/70R17 ?

I have always found a tire size calculator to be a handy tool when trying to pick a new tire when stock is not available.

http://www.miata.net/garage/tirecalc.html

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Old 06-16-2010, 05:30 AM   #8
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Default Re: Tires: ? 255/70R17 vs. 265/70R17 ?

haha. why use a tire calculator??? use your own brain and a real calculator! it's actually really easy once i learned the formula.

255/70R17

take 255 (width of tire in mm) divided by 25.4 (mm per inch). multiply by 2. multiply by .7 (aspect ratio), add 17 to answer. equals 31.1".

anyhow, shouldn't make much difference. however, i do NOT like going taller. sure, lowers your effective ratio, however LARGER tires WEIGH more, and that can screw you worse than the "drop" in ratio. like i went from the stock 235/85 to 265/75 tires, same height, 265 is wider. and i lost mileage because of it...


anyhow, the difference you're talking probably won't be noticed much because almost nobody is as anal as i am about tracking mileage and such...

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Old 06-17-2010, 03:31 AM   #9
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Default Re: Tires: ? 255/70R17 vs. 265/70R17 ?

Quote:
Originally Posted by spence
haha. *why use a tire calculator??? * ...
Because I don't need to learn the formula and your formula did not provide the speedometer adjustment which is critical if a significant change in size is made.

duh
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Old 06-17-2010, 03:59 AM   #10
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Default Re: Tires: ? 255/70R17 vs. 265/70R17 ?

I did the spence routine almost 20 years ago for my 72 Blazer with the 4" lift, 36" tires and a different gear ratio than the speedo was set for. I worked up speeds based on tachometer at given rpms in 5 mph increments from 35 - 65 and did a cheat index card until they were worked into my memory. It worked for me for 15 years. Granted it didn't work if I wasn't in high gear, but then I would usually be in traffic and just matching speeds anyway. That thing has enough torque I could put it in high gear at 30 and just idle along in town.

You can go a step further by multiplying the 31.1" (tire diameter/height) x Pi to get the circumference of the tire, divide 1 mile (5320') by the circumference and figure out how many times the tire rotates in 1 mile. Multiply this number by 60 to get your rpm at 60 mph. It made for 3 good days of brain bending and calc-ee-lating for me to get all the multiples for the lower speeds!!!





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