Hi Everyone,
Brand new to Mdxer here. We recently got a CPO 2017 MDX. I too hated the anorexic tires. We also looked at the Volvo XC90 when shopping and for some reason our local Volvo dealer has 275 beefy tires on almost all of their xc90, even the base T5 models. Then I looked at the MDX and thought man, what was Acura thinking?! So i went and got Michelin 255/50/20 Defender LTX tires after reading this thread. Although I would love to get 265, I wasn't sure if that's a good idea on the 8" rims according to the Tire Size Calculator posted by MCDavis on post #2. I took before/after pics. With 265 I think we'll definitely see a difference even in pictures, with 255...not so much. At least not in pictures (sorry maybe it's the way I didn't keep the camera distance consistent), but I can see a bit of improvement in person. Size difference aside, IMO (and those of quite a few people online) the Michelins are better tires. I think they're much better than the stock Continental CrossContact: higher speed rating, longer thread life and extra load rated.
Acura offers wider wheel/tire upgrade, but I think this is the most economical route for a little size improvement. Big improvement in term of tire quality though. Then again, we all can upgrade to the 2019 MDX with the A-Spec package right?