The return of 650b, an old French wheel standard, is being driven both by the increasingly poor state of our roads and also a growing desire to get of the roads completely and head into the countryside on off-road tracks.
The smaller wheels allow a bigger tyre to be used which provides a lot more cushioning, meaning a smoother ride on rough roads, and lower pressures for off-road grip.
In this video we've rounded up six road plus and gravel bikes that are designed around 650b wheels and tyres, to give you an idea of the different ways bike manufacturers are embracing this trend.
David has worked on the road.cc tech team since July 2012. Previously he was editor of Bikemagic.com and before that staff writer at RCUK. He's a seasoned cyclist of all disciplines, from road to mountain biking, touring to cyclo-cross, he only wishes he had time to ride them all. He's mildly competitive, though he'll never admit it, and is a frequent road racer but is too lazy to do really well. He currently resides in the Cotswolds.