Can you put 15 inch tires on a car that normally uses 16 inch tires?

Only if you put 15 inch wheels on there as well.

16 tires refers to the diameter of the wheel it fits on. So, if you have 15 tires, and 16 wheels, it's pretty obvious that it won't fit.

What REALLY matters is the actual dimension of the tire, as well. A 16 inch tire can be small and skinny, or the size of monster truck tires.

All it tells you is what the size of the wheel is.
 
My car currently has 16 inch tires and one of my neighbors is trying to tell me that I can put 15 inch tires on instead of 16 inch ones. He has a newer version of my car and has done the same thing. Is this possible?
 
The 15 and 16 is not really the size of the tire, it's the diameter of the wheel the tire is mounted on, so, to answer your question... Yes, you can mount 15 inch tires on your car, but you'll have to change the wheels also.
 
as long as you use a taller tire, yes, you want to keep the overall size of the tires the same (if you run a 235/65/R16 now youd want to run a 235/75/R15 on the 15 inch wheels) that just a rough estimate to give you an idea of what im talking about, you may have to go to a tire shop and ask them what the ideal tire size would be for you to run a 15" wheel
 
It's very possible.
I do it at work all the time, especially for in the winter.
People with 19" rims don't want to run 19" runs in the winter, so we can downsize to 16-17", but adjust the tire size to have the same overall diameter so that the speedometer will not be off at all.

You just have to make sure that the smaller rim that you use has the proper offset, bolt pattern, proper hub fitting, and proper rotor and caliper clearance.

An example is newer 2 wheel drive Dodge Ram's with the "appearance package" use 275/55R20 tires.
Customers come in for winter tires and we put 265/70R17 winter tires and rims on them no problem.
As long as the diameter is within 3% of the original there is no adverse effects.

The example I used is less than 1% off in diameter, and the speedometer will be off by about 0.60 MPH, which is not even noticeable.
 
It's very possible.
I do it at work all the time, especially for in the winter.
People with 19" rims don't want to run 19" runs in the winter, so we can downsize to 16-17", but adjust the tire size to have the same overall diameter so that the speedometer will not be off at all.

You just have to make sure that the smaller rim that you use has the proper offset, bolt pattern, proper hub fitting, and proper rotor and caliper clearance.

An example is newer 2 wheel drive Dodge Ram's with the "appearance package" use 275/55R20 tires.
Customers come in for winter tires and we put 265/70R17 winter tires and rims on them no problem.
As long as the diameter is within 3% of the original there is no adverse effects.

The example I used is less than 1% off in diameter, and the speedometer will be off by about 0.60 MPH, which is not even noticeable.
 
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