"mkbruin, Atlas VP" (mkbruin) 06/13/2015 at 15:06 • Filed to: None

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Tire question: Minivan tech. Factory spec is P235/60r17. I want to put on a set of LT225/65r17. Any foreseeable issues with the change?

HammerheadFistpunch > mkbruin, Atlas VP 06/13/2015 at 15:16

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This is my go-to link

size issues aside, going from a P to an LT might bring a harsher ride.

Short-throw Granny Shifter is 2 #blessed 2b stressed > mkbruin, Atlas VP 06/13/2015 at 15:17

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Nope. New tires are only about 10 mm larger in diameter.

tromoly > mkbruin, Atlas VP 06/13/2015 at 15:21

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What’s the load range difference? That’ll be your biggest problem.

Klaus Schmoll > Short-throw Granny Shifter is 2 #blessed 2b stressed 06/13/2015 at 15:41

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Shouldn’t that affect gearing and speedo accuracy?

Textured Soy Protein > mkbruin, Atlas VP 06/13/2015 at 15:44

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Why oh why would you put LT-metric tires on a minivan?

Rusty Vandura - www.tinyurl.com/keepoppo > mkbruin, Atlas VP 06/13/2015 at 15:46

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My advice: don’t do it. Stick with factory recommended tyres. And the LT rating is likely to be a harsher ride.

Short-throw Granny Shifter is 2 #blessed 2b stressed > Klaus Schmoll 06/13/2015 at 16:13

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Yeah but diameter is directly proportional to speed, so your speed will only be 1.5% off. So like 61 mph actual at 60 mph. Your speedo is probably off on calibration by more than that.

boxrocket > mkbruin, Atlas VP 06/13/2015 at 17:38

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Your overall circumference of going to be pretty close, so mechanically there’s minimal concern there, but most LT treads tend to be chunkier, so there will be more road noise, potential issues with vibration from the chunks, harsher ride, and they’re likely heavier, increasing unspring weight. Some tire places may not install LT tires on it or they may not warranty them.

My suggestion is to get a set of Extra Load (XL on the sidewall or written out) passenger tires with a high (60-80K) treadwear life. Yes, the Sienna (and other fat-ass minivans like the Odyssey and Quest) goes through tires because it’s such a porker, but proper tire selection and maintenance will do a lot to make them last longer.