I found that Duro tires makes a tire the HF319 in 2.00-19 for around $22.99 locally. But availability is non-existant until April 24th in Canada.
These are also "Duro" brand tires.I found https://www.schwalbetires.com has 19x2.00 tires (HS231) for $29.90 in Victoria, BC
What he said. A single speed with coaster brake is completly adequate for the speeds these engines like to run. If you had gears, you would have to disengage the motor to go fast LOLMuddy, you don't need gears. The pedals are for resting your feet, or making it to the next gas station.