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Discussion Starter #1
My 2017 came with 18" tires and a spare 17". Why do some 2017 CR-Vs come with 17" tires and others 18"? What are the pros and cons of each? Could I have 18" on the rear and 17" on the front?
 

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All four need to be identical, wheels and tires.

Both sizes have the same circumference but different side wall.

18"+ have better handling at higher speeds, 17" is more comfortable and cheaper tire wise.

Different spare wheel is ok.
 

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2017 CRV Touring - Pearl White w Black Interior
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The trim level of the vehicle (ie: LX, EX, EXL, Touring) determines the wheel size for the normal road wheels. Cost is what Drives Honda to use smaller wheels and tires on lower trim levels (where profit margin is squeezed the most).

As for the spare.. it's a compact spare so it drives terribly, and is speed and distance limited, anyway so it really does not matter. NEVER drive over the stated speed limit for the temporary spare as it may cause abnormal wear on the drive and traction systems.

What you do not want to do is mix tire sizes on your road wheels if you have AWD. It will confuse the traction control systems and probably will trigger TPMS warnings too.
 

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Discussion Starter #4
Thanks, funny how when someone explains this, it all makes perfect sense.

Does anyone have experience with doing mixing tire sizes and having some information on what happened? I suppose if a very low aggressive driver had mixed tires, the results would be quite different than if an aggressive offroader does it? Like everything, nothing's the same for everyone.
 

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Everything in Moderation
2006 CR-V EX, 5MT
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Overall diameter of the wheel & tire assembly is the measurement that you must match with Honda's 4WD systems.


You can compare them at a site like this:


NEVER mix tires left to right. (There is a reason that 'donut' spare tires limit you to 50 MPH, and short distances.)
 

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2020 CRV EXL 2WD
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If you put 16" in front and 18" in back, you could be like:


:D

If you have 18" wheels all around and a 17" spare, my guess is that the spare tire might be higher profile and the rolling circumference pretty close to your 18"ers
 

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In theory you could run 17" front and 18" rear. The tires would have to be matched for diameter so they roll out the same. There would be more negatives than positives though.
 

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In theory you could run 17" front and 18" rear. The tires would have to be matched for diameter so they roll out the same. There would be more negatives than positives though.
Handling and predictability would be off significantly tho.
 

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That is debatable.
The 2019 Corvette had 18/19's or 19/20's installed as OE. The Vette isn't alone in using mixed wheel sizes.
LOL
 

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Everything in Moderation
2006 CR-V EX, 5MT
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Handling and predictability would be off significantly tho.
As with all such things, you would get used to the difference in handling. Heck, that is one of the reasons that tire stores put the new tires on the back if you only buy two.

Just go slow the first 100 miles, 'test the limits' (or at least, the 'feel').:p
 

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As with all such things, you would get used to the difference in handling. Heck, that is one of the reasons that tire stores put the new tires on the back if you only buy two.
Stability control has no idea what to do with different sidewalls with different flex. In case of the CR-V that is, excluding sports cars that were designed to have different wheels/tires.
 

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Everything in Moderation
2006 CR-V EX, 5MT
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Stability uses yaw sensors, not tire readings, AFAIK. So, tires with different sidewall profiles would probably not cause a false stability reading. (Well, maybe if you went fast enough to corner on two wheels, LOL)
 
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@Carbuff2 We are talking about different things here. You probably have driven the same car with different tires. The most obvious case being winter and summer tires, both perform differently. But back to same type of tires: half an inch difference in sidewall height make the car behave noticeably different, all other parameters being the same (width, circumference, tread). The engineers have done their best to balance the car's behavior with the current suspension setup. Having different flex, bounce and traction due to previous two will throw off the logic of the expected and corrected action.
 

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Stability uses yaw sensors, not tire readings, AFAIK. So, tires with different sidewall profiles would probably not cause a false stability reading. (Well, maybe if you went fast enough to corner on two wheels, LOL)
I think VSA is much more complicated on the newest generation CRV. Honda Service Manual Website lets you Download!

How it plays out with respect to tire variations though I don't know for sure.
 

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