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Might be a silly question but I am not a car guy.

Currently on 17” 205/55 R16 91H.

found a set on market place that are on 16” honda rims 205/55R16 91H.

Will these work?

 
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both are the same tire size?
you will need to check off-set of the wheels

 
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well, i measured my rims with a tape measure and got 17” but the tire itself says r16 so I am slightly confused.

Edit: To clarify, my car has 17”rims measured with a tape measure, the tires on the 17” say r16. So either im using this tape measure wrong or i have the wrong size tires on my rims.

The new set of rims and tires are 16” rims with r16 tires

Edit 2: Okay so Im assuming I'm just measuring wrong. My friends car is sitting on 18.5” rims but when u measure it it comes to 19.5 so it seems like I'm not measuring correctly.

 
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just go with what is written in the tires...
Diameter is measured at the tire beads, the lip height does not matter
honda uses mostly same off-set, so maybe safe?
check if the number of studs are the same, 4 or 5 lugs

 
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Could always bolt one on to test. 16" should be fine though