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2.8" should definitely fit; I think they came as stock one some builds a while back.

I see absolutely no point in either an oval ring or a 2x setup on an electric bike. Rear range is already too large for an ebike as-is, both 11-46 and 11-42 with a front 38 chainring offer a lot more range than you'd reasonably need, like, ever. If you are actually using 38-46 you are probably...

What you're after is the 2.8" Schwalbe Super Moto X tires.

Pacific Cycles is one company that makes R&M frames; I contacted them at some point wrt frame production but they basically blew me off, saying they don't sell R&M products except the Birdy (I have no idea what that is).

No offense to anyone, but that CUBE rear rack is hideous and probably completely impractical. The R&M Delite rack can handle very heavy loads (I've loaded it up to 25kg) while still preserving full dual-sus functionality. R&M really has this figured out and there's nobody that's done it better...

What is this "super delight 2020"?

I strongly recommend that instead of replacing that wheel, you replace the right dropout instead. R&M have effectively admitted that the roller wheel design is flawed by phasing it out completely from their bikes. This wheel caused the chain to be too tight initially and too slack once it's seen...

I own the Blackborow, though I have not made it electric. The front fork is carbon, so I would not use it for a hub motor. Rear hub motor is very difficult too because the Blackborow rear is 12/197 thru axle, not QR. A mid-drive like BBSHD is also not a great idea because the way the tubes are...

Actually, that's not true. Most commercial ebike rims have 32 holes and some formats (e.g., ebikes) are almost exclusively 32H. You do meet 36H occasionally on the rear wheel when a heavy hub such as Rohloff is used, but this is the exception rather than the rule.

There are many reasons including: Zero delay engagement. Yamaha is able to start up in any gear, whereas Bosch is really difficult to spin up if you're in high (fast) gear. Yamaha uses 104BCD chainrings. Bosch, until recently, used proprietary ones, including Miranda chainrings that cannot be...

Any reason why commercial ebike companies cannot simply use LiFePO4? Sure, they take an initial price hit and you get half the range, but for rentals, does it really matter that much? You reduce range from 100km to 50km, for a typical tourist that is still a huge distance, way more than they'd...

One approach to dogs is to buy a $5 electronic bell. It's designed to be audible to car drivers (not to be used indoors — you have been warned!) but it really scares dogs. It also scares pedestrians. And other riders. It's kind of like the equivalent of green lasers. Personally I have plenty of...

Okay, even more upgrades. It never ends, does it? Anyways, here goes: Replaced the Kona Wah Wah pedals with Shimano Saint ones. Main motivation is to finally remove these huge plastic pedals with very long spikes (excellent for tearing shoes/jeans) with proper DH metal pedals. Added a Topeak...

If you're interested in specifically 20×4¼" tire maybe you can use this tire? And Classic-Cycle also has plenty of 26×4" options.

Maybe. But I wouldn't obsess whether or not the connector is compatible. Just get the best light you can afford, installation is very easy nowadays, and if you can't be bothered, your LBS will do it for you.

To be perfectly honest, bikes without suspension are not great at handing this sort of weight. You can move to double-wall rims and increase the number of spokes from 32 to 36 or even 40 (though 40-spoke rims are 'vintage'), that might help. Also reducing tire pressure so more weight is absorbed...

You cannot add additional cells to the battery. Simplest solution would be to buy an additional battery and carry it with you.

Here you go: link.

Just to add to this, I purchased such a module from Cosas in Germany, built my 36V battery and can confirm that it does, in fact, work.

Can FLYON be derestricted?