Depends on the type of cycling you're talking about.
Single rider, flat ground, fairly regular looking road bike - about 38 MPH / 60 KMH. Flat ground, fairly regular looking MTB - about 25 MPH
Road bikes, downhill - maybe 50 MPH
MTBs- downhill course - 80 MPH
Custom bikes, special courses - can be whatever.
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First of all the bike doesn't go anywhere w/o its rider, and the rider is usually held to be more important than which bike he's on. Secondly it's all down to circumstances Bikes have been towed or otherwise helped to speeds over 200 km/h, while a reasonably normal-looking road bike ridden unassisted on flat ground won't do much more than 60 km/ at best.
First of all the bike doesn't go anywhere w/o its rider, and the rider is usually held to be more important than which bike he's on. Secondly it's all down to circumstances. Bikes have been towed or otherwise helped to speeds over 200 km/h, while a reasonably normal-looking road bike ridden unassisted on flat ground won't do much more than 60 km/h at best.
There are too many ways to ride for there to be a sensible answer to that. A road rider may do 25 MPH, a casual rider maybe 10, a DH MTB-er might do 50 etc etc.
A professional cyclist can ride 50-60 maybe 70. I'm very sorry if I'm wrong.
on the flat mark cavendish(gb) can reach 45mph! on the velodrome and down hill im usure but id like toknow