Just installed the tires last night and rode into work today (21 km) and let me tell you, there is a HUGE difference in the way it rides. At 20 psi they ride so much smoother and with a lot less rolling resistance than the stock tires. It also gives the bike a more unique look.

Here's the link to the only place I found that still had them in stock.

https://www.bicyclebuys.com/vee-tire-speedster-tire-20x4.0-wire-black-whitewall/0602044