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I have not. If I get a flat, I likely will, but I've had none in the first few months.

I inflate to the max, then reinflate when the tires feel squishy. 65 will give lowest rolling resistance. 40 will give a softer ride.

Wouldn't you want the computer set for smaller diameter tires if you want a higher top speed? It most likely meters rpm.

I think the straight handlebar is why the sport is faster. The farther the rider leans forward, the lower the wind resistance and the more efficient the pedaling. Hence, sport versus cruiser.

R1up specs 62# here: https://ride1up.com/product/700-series/

The toughest part is getting it out of the box. Check for a bent derailleur guard, which seems the weak point of Espin packaging.

The Flow gives a more upright riding position and is easier to mount and dismount. The Sport gives a more athletic riding position and has a stiffer frame, better for aggressive riding.

I've had no flats nor used slime so far. If I get a few flats, I'll likely get puncture-resistant tires. I do try to ride around broken glass and metal debris.

If you want to get technical, tire size has several effects. Increased contact patch means increased friction. Increased tire width means increased air resistance. Increased tire weight means greater inertia, meaning more power needed to accelerate and more friction needed to stop. On the flip...

There is a reason road bikes have tires as narrow as 23mm. It is not for style.

As long as less range and more difficult pedaling if the battery runs out of juice are okay with you.

I would not consider wider tires an upgrade. They are heavier and resist air more. If I upgrade, it will be for puncture protection and retroflective sidewalls. If I rode over soft ground a lot, I might want wider tires.

For $1200 the Espin Sport or Flow would be a more competent and complete bike.

Did they say how it could be changed to nine levels?

I am more than satisfied with the Espin Sport. That it was from the first batch from a new manufacturer in a new nation of origin indicates commitment to quality control. I'd buy another if I needed a second bike.

When I began riding the Espin Sport, my first e-bike, I thought level one assist was too strong. After a few weeks riding, I mostly use level two and have no desire for a lower level of assist.

I do not think power levels are adjustable. I, too, felt level one had too much boost until I had ridden my Espin Sport for a while. Now I am usually in level two.

I see nothing on the Espin like that. There is nothing inside the center of the crank but the cap on the bearing chase. It looks like one piece of steel.

The handlebar stem has a knuckle that allows more or less rise. Besides the screws and rivets holding things together, I see nothing on the crank wheel or on the guards on either side of it.

Good specs if 62 pounds is okay with the rider.