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One, 185 60 r15C tire on a fit. Went un noticed

Old Jan 11, 2025 | 04:10 PM
  #1  
C3nuke's Avatar
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From: Houston
One, 185 60 r15C tire on a fit. Went un noticed

Hey everyone...

One of my tires is size is 185 60 r15c. I had a flat and used the donut to just to a used tire shop, and I was didn't notice till I got home, it said r15c on the back right.

I heard it's for Comercial use, like heavy loads.

I'm just concern if that's an issue or not a big issue. If it's not a big problem then I won't worry, eventually I will buy till new set or tires.

My front right is also 175 65 r15 (which I was told by a different guy, that it's not much of an issue)

I change my tires, sometimes used because there's so many potholes and sometimes nails get in them... Then the next morning it's flat.

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​​​​​Anyways sorry for rambling, and thanks for any advice, comments or suggestions




 
Old Jan 11, 2025 | 07:38 PM
  #2  
saveMT's Avatar
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Joined: Dec 2020
Posts: 141
From: Las Vegas, NV
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It says revolutions per mile is different by 1%.
https://www.wheel-size.com/calc/?whe...cl=50mm&sr=0mm

The one off tire being on one of the rears might not matter, but having mismatching tires on the drive wheels (front left / front right) might cause problems to the differential. This is such a big deal that on AWD/4WD cars, they don't even let you replace one worn tire. If you damage one worn tire, you're supposed to replace all four, or shave the new tire to match the other tires. That's why you're not suppose to use a donut spare for too long, even disregarding the reduced ability of donut spares.

Come to think of it, even without the differential issues, all modern cars do a lot of things using wheel speed sensors, like ABS, VSC, and even TPMS. Having different size tires is a bad idea, no matter how I think about it.

What the heck kind of tire shops are these? They just throw you a tire, even though they don't have a correct size, just to make a sale?
As for the "C"ommercial part, I don't think it'd matter.
 
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