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At the normal tire size of 265/45R20 there is enough room for the tires when fully turned on either side in fender well and more than an inch of more space remaining at the standard OEM size.

Consider an example, for those switching to 265/60R18 sizes on their PPs. The overall height of the tire will increase by 0.55" and so it'll be closer by 0.55" to all sides of the fender well. This could cause tire rub in 2 cases.

Case 1: If the offset of your wheel is +55mm then the wheel is positioned exactly same as the OEM, just the tire bigger in size. So at cornering and bumps, it is highly likely that it'll rub against the fenders. Driving on straight highways will not cause any rubbing.

Case 2: If the offset of the wheel is less than +41mm. In this case the tire will be 55mm farther out. So when turned full on either side, incremental height of 0.55" as well as a tire shifting outward by 0.55" will cause the tire to rub against fenders. Any offset of less than +41 mm will cause this wheel to stick out by the amount higher than 0.55". Rubbing will not occur while driving on smooth straight roads even in this case.

Conclusion: When changing to this size (265/60R18) the tire will not rub as long as you select proper offset for the wheel (optimally +45mm / +44mm).

The amount in mm by which the tire sticks farther outwards has to be less than the amount of increment in overall height in mm of the tire.

For example:
265/60R18 tire will increase by 0.55" in overall height and a wheel with +45 mm offset will have it stick farther out 0.39", which is safer. But a wheel with offset of +38mm will have the tire stick farther out by 0.67", which will cause rubbing on bumpy roads, cornering, etc.

I apologize for this longer post. I am trying to work this out mathematically guys. I am very sorry if I have bored you with my long post. My calculations are based on numbers calculated from tiresize.com as well as approximations by physically sticking my hands behind my tires.

Of course this may be true for increasing tire size only within reasonable range.
 

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No need to apologize! I appreciate the calculations. I've heard about off-set rings or spacers to make a replacement wheel meet the OEM offset, but i would image they can only be used if the offset is less than the OEM offset, not over the OEM offest. Is that correct or do I have it reversed?
 

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No need to apologize! I appreciate the calculations. I've heard about off-set rings or spacers to make a replacement wheel meet the OEM offset, but i would image they can only be used if the offset is less than the OEM offset, not over the OEM offest. Is that correct or do I have it reversed?
Most aftermarket wheels are lower offset and thus stick out farther.

Calculating tire size mathematically and with finger gaps is fine and dandy but doesn’t take into account real world scenarios like suspension compression for bumps and turns, nor- dare I say again - debris like mud or gravel.

Don’t overthink it.
 

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No need to apologize! I appreciate the calculations. I've heard about off-set rings or spacers to make a replacement wheel meet the OEM offset, but i would image they can only be used if the offset is less than the OEM offset, not over the OEM offest. Is that correct or do I have it reversed?
spacers decrease offset (make wheels stick out farther. can’t go the other way. Really only OE honda wheels will have the original spec offset. All the aftermarket stuff is going to stick out farther.
 

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No need to apologize! I appreciate the calculations. I've heard about off-set rings or spacers to make a replacement wheel meet the OEM offset, but i would image they can only be used if the offset is less than the OEM offset, not over the OEM offest. Is that correct or do I have it reversed?
If the offset is higher, the tire is now mounted farther inwards. To correct this, spacers or offset rings are used. With most aftermarket wheels though it will seldom (almost never) be the case because mostly all wheels we have found for passport has had offsets of +45 or lower.
 

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Most aftermarket wheels are lower offset and thus stick out farther.

Calculating tire size mathematically and with finger gaps is fine and dandy but doesn’t take into account real world scenarios like suspension compression for bumps and turns, nor- dare I say again - debris like mud or gravel.

Don’t overthink it.
:) my passport is soon getting installed with:

Nitto Terra Grappler G2 - 265/60R18
On an 18 x 8 wheel with 5 x 120 bolt pattern, 64.1mm bore and +45mm offset.

My dealer has ordered tires but they are expected to arrive in 4 weeks after which the installation will be done. So I'll confirm if my calculations hold true in real world scenario.
 

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:) my passport is soon getting installed with: Nitto Terra Grappler G2 - 265/60R18
My dealer has ordered tires but they are expected to arrive in 4 weeks after which the installation will be done. So I'll confirm if my calculations hold true in real world scenario.
I am very interested in hearing how the Nitto G2's are on dry pavement; cornering, braking, accelerating, and perhaps most important; how quiet, smooth and comfortable they are compared to the original tires... (thanks in advance)...

As these are at the top of my list, when I make the wheel change...
 

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I am very interested in hearing how the Nitto G2's are on dry pavement; cornering, braking, accelerating, and perhaps most important; how quiet, smooth and comfortable they are compared to the original tires... (thanks in advance)...

As these are at the top of my list, when I make the wheel change...
I will update you first thing after I install em on my beast !! :D
 

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Niku_soni , I have an appointment in Brampton in March. I wouldn’t mind meeting up with you to have a look at your new set up, you should have it on by then.
 
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Niku_soni , I have an appointment in Brampton in March. I wouldn’t mind meeting up with you to have a look at your new set up, you should have it on by then.
Absolutely. I'll let you know once installed. We can definitely meet up in March. Dealership said the tires will arrive by end of Feb or beginning of March. I'll update you.
 

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I just installed the "LT255/65R-17 BFGOODRICH ALL-TERRAIN T/A KO2 D" tires on KMC KM708 17x8 wheels on a 2019 Passport Elite and have no rubbing. At its closest point during full lock, there's maybe 3/16" of clearance at the tire's closest point.
IMG_20200825_105531.jpg IMG_20200825_105524.jpg IMG_20200825_105335.jpg IMG_20200825_105326.jpg IMG_20200825_104816.jpg IMG_20200825_104802.jpg IMG_20200825_104756.jpg
 

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@kslu_wa I will let you know very soon! I literally just picked the tires/wheels up this morning and got one quickly test fit to make sure there was no rub since I was worried about it. I'll get the last three put on after work and get a full picture of the setup to share. :) Ride quality will have to come in time, but I'll plan to do a quick drive around to see how it feels.
 

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Got the rest installed and am really happy with the final results! Here are some photos.
IMG_20200825_175438.jpg IMG_20200825_175430.jpg IMG_20200825_175418.jpg IMG_20200825_174903.jpg IMG_20200825_174814.jpg IMG_20200825_174807.jpg
These are my first pair of A/T tires ever, and I drove about 10 miles, so take my very anecdotal and inexperienced feedback with a healthy grain of salt. Compared to the OEM wheels and tires, I noticed more road noise (but by no means annoying or off-putting), a similar smoothness (couldn't tell that these were an aggressive tread tire by the feel of the drive), and a bit less responsiveness at highway speeds while turning (felt like it would "float" a little bit more before initiating the turn). None of these differences are major or off-putting to me. YMMV. Overall, I'm very happy with the setup!
 
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