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Old 02-19-2014, 07:41 AM   #1
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Smaller Spare an Issue???

Just upgraded tires to hankook mt 285 70 17 on my 2011 JKU. Want to keep the BFG MT 255 75 17 as spare. Will that be an issue to drive on in the event I get a flat? Thx

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Old 02-19-2014, 07:51 AM   #2
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Simply put, YES, that will cause an issue if you ever have a flat. The difference in diameter between the tires will be more than 1/2 inch and could lead to handling issues if the BFG MT is substituted for the flat tire.

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Old 02-19-2014, 08:12 AM   #3
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If you get the 5th tire and use it as a regular part of your rotation you will extend the tread life of your tires. Tires have a shelf life as well as a tread life. It really makes no sense not to rotate in the spare.
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Old 02-19-2014, 09:22 AM   #4
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Thanks for the info. Was hoping to save $250. Oh well.
Just ordered Hankook MT 285 70 17 from DTD $227 great price too
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Old 02-19-2014, 09:30 AM   #5
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It should be fine to have a smaller spare. Most new cars come that way.
You just need to stay under 45 mph and only drive to get the flat repaired.
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Old 02-19-2014, 09:36 AM   #6
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I would go with a full size spare myself. Cheap insurance IMAO. Running different size tires will cause the tires to wear unevenly. Travelling a short distance is no big deal. But you never know how far you will have to travel. New cars come with small spares to reduce weight and increase gas mileage. They do not care if it ruins a ture in the process.
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Old 02-19-2014, 09:40 AM   #7
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IF you must use the spare, even for a short distance, it needs to be on the front axle. It's extra wear and tear on the rear differential (always powered) if the two tires have different diameters. It's not an issue (as bad) to put the two mis-matched tires on the front axle if not powered (not in 4WD) but it will handle strangely. As stated above, it's just a no-brainer to buy 5 all the same size, and add the spare into the rotation. Expect a 20% increase in tire life rotating 5, rather than 4. (50,000 miles with a 4 tire rotation each of the four has been on the road for 50,000 miles, but 50,000 miles with a 5 tire rotation each tire has only been in use for 40,000 miles.)
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Old 02-19-2014, 09:44 AM   #8
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Originally Posted by Plasticpirogue View Post
IF you must use the spare, even for a short distance, it needs to be on the front axle. It's extra wear and tear on the rear differential (always powered) if the two tires have different diameters. It's not an issue (as bad) to put the two mis-matched tires on the front axle if not powered (not in 4WD) but it will handle strangely. As stated above, it's just a no-brainer to buy 5 all the same size, and add the spare into the rotation. Expect a 20% increase in tire life rotating 5, rather than 4. (50,000 miles with a 4 tire rotation each of the four has been on the road for 50,000 miles, but 50,000 miles with a 5 tire rotation each tire has only been in use for 40,000 miles.)
Interesting, I did not know that. This is regardless of whether rear has an lsd?
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Old 02-19-2014, 09:47 AM   #9
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Quote:
Originally Posted by Plasticpirogue View Post
IF you must use the spare, even for a short distance, it needs to be on the front axle. It's extra wear and tear on the rear differential (always powered) if the two tires have different diameters. It's not an issue (as bad) to put the two mis-matched tires on the front axle if not powered (not in 4WD) but it will handle strangely. As stated above, it's just a no-brainer to buy 5 all the same size, and add the spare into the rotation. Expect a 20% increase in tire life rotating 5, rather than 4. (50,000 miles with a 4 tire rotation each of the four has been on the road for 50,000 miles, but 50,000 miles with a 5 tire rotation each tire has only been in use for 40,000 miles.)
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Old 02-19-2014, 09:56 AM   #10
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Tom,
I guess us old farts think alike.

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