Hmmm, wonder what the rear id measurement is from dropout to dropout is on the 2.0. Would it be the same as the OGXP? I mean it would have to be, if they're using the same hub motors. All along I'd thought they'd redesigned the bike, there by implementing a 'skinnier' rear hub. It's all speculation for me. ANYWHO! Brass Tacks= If you are relacing said wheels, the only additional part you'd need (besides the stock wheel you would already have) is the new rim to accommodate the 20x3 tire. Probably not AS expensive as you're thinking. AliExpress/eBay that particular rim, use the axel, bearings, hub motor, spokes you've already got. Take a spoke wrench & uninstall the 'stock' outside rim. Now, once you have the new rim in, you can start installing spokes to the said outside rim. And there you are, & I'm just guessing, you'd only be into it maybe $15-$20 on the part. Tires is where your going to spend money, good thing the 20x3 variety aren't NEAR as expensive as the 20x4 from what I'm seeing! If you ever do, you should document it, so that others can see what you've done!