Mountain Bikes - YES

Hybrids - YES

Ladies Bikes - YES

Bikes a WeeRide won't fit on include serious downhill/free-riding mountain bikes - with enormous front suspension - very very unlikely you'd want to a put a WeeRide on one anyway...

Bikes you probably shouldn't fit a WeeRide on include Racers with drop handle bars - the riding position is more aggresive, bars are narrower and getting to the 'drops' where the brakes/gears are is difficult.