[citrusybread]

check out velomobile, recumbent bicycles with a fiberglass shell that can go crazy fast (60km/h is not unheard of).

[tromp]

And 144km/h is possible, but only for the world record holder:

https://www.cbc.ca/sportslongform/entry/the-worlds-fastest-h...

[vbarrielle]

60km/h is sprint speed for elite cyclists on road bikes, I guess recumbent bikes can go way faster than that.

[Schroedingersat]

Faired can cruise at 60km/h on the flat at similar effort to 25km/h on a road bike. Marginally slower on steep uphill.

Unfaired won't have you going much faster, maybe +5km/h on the flat and -3km/h on the uphill.

[Turskarama]

At high speed on flat ground aerodynamics matters significantly more than weight, so velomobiles tend to be a lot faster.

Uphill is a different story.

[lmm]

I hit 90 km/h on my recumbent as a fat bloke loaded up for touring. It was on a downhill though :).