Need help!

[Eastcoastdiesel]

I need to ask,

If my truck has a 285/70/r17(stock) can I use 275/55r17 size on it? It's a dodge 2500 2010 cummins.

I know I know.... Just not well versed in tires and someone just gave me 5 brand new tires for fixing an egr cooler.

Helpppppp!

Thanks y'all's!

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[j hancock]

Yes you can but it will be a shorter tire. To do the same mph, your truck will be turning more rpm.

Also, verify the carrying capacity of the tire if this is a truck that gets loaded.

[farmer52]

agree with j hancock....worse fuel mileage

Here is a website to help

www.rimsntires.com

Click on Size Comparer under Tools heading (left column)

60 mph indicted will be about 53 actual.

[HarryS]

Here's a comparison of the two sizes. You can see the speedometer will be off and you will use more RPMs to get the correct speed. Your truck computer may adjust or maybe it can be programed to the new size. One other consideration is the ride with less sidewall and the new tire not being mounted on the correct width rim. Below came from a google search comparing the two sizes.

Side by side Overlay

285/70-17 275/55-17 Difference

Diameter inches (mm) 32.71 (830.8) 28.91 (734.3) -3.8 (-96.5) -11.6%

Width inches (mm) 11.22 (285) 10.83 (275) -0.39 (-10) -3.5%

Circum. inches (mm) 102.76 (2610.04) 90.82 (2306.87) -11.94 (-303.16) -11.6%

Sidewall Height inches (mm) 7.85 (199.5) 5.95 (151.25) -1.9 (-48.25) -24.2%

Revolutions per mile (km) 616.6 (383.14) 697.63 (433.49) 81.03 (50.35) 13.1%

275/55-17 TiresMichelin Latitude Tour HP275/55-R17$229 eachKumho Road Venture APT KL51275/55-R17$155 eachSee All 275/55-17 Tires (7)

Speedometer Difference

Speedo Reading Actual Speed

20 mph (32.19 km/h) 17.68 mph (28.45 km/h)

25 mph (40.23 km/h) 22.1 mph (35.56 km/h)

30 mph (48.28 km/h) 26.52 mph (42.67 km/h)

35 mph (56.33 km/h) 30.93 mph (49.78 km/h)

40 mph (64.37 km/h) 35.35 mph (56.9 km/h)

45 mph (72.42 km/h) 39.77 mph (64.01 km/h)

50 mph (80.47 km/h) 44.19 mph (71.12 km/h)

55 mph (88.51 km/h) 48.61 mph (78.23 km/h)

60 mph (96.56 km/h) 53.03 mph (85.34 km/h)

65 mph (104.61 km/h) 57.45 mph (92.46 km/h)

Gear Ratio / RPMs for New Tire (@ 65 mph) 2.35 2.73 2.94 3.07 3.21 3.31 3.42 3.55 3.73 3.91 4.11 4.27 4.56 4.88 5.13 5.29 5.38 5.71 6.17 7.17

1775 2062 2221 2319 2425 2501 2584 2682 2818 2954 3105 3226 3445 3687 3876 3996 4064 4314 4661 5417

Better Fuel Economy Factory Ratios Increased Power

[rsb502]

I doubt they will have the same load rating either, don't know how much you load your truck but it may be a better idea to use them as trading material to get the right size.

[Eastcoastdiesel]

It didn't even have a load rating haha! I'm gonna sell em on Craigslist see what I can get. I guess it's still the terra grapplers I gotta buy! Oh well.

Thank y'all boys! You were a wonderful help

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