When Gower College lecturer Calvin Williams fell from a cliff 50 feet (15 metres) high in 2004, he feared his love of mountain biking might be over.
With extensive leg injuries that would confine him to a wheelchair for a year, he realised there were other similar people in his position who were unable to ride a standard two-wheeled mountain bike.
So he decided to design and build a bike with four wheels that could be ridden by disabled people, and the fruits of his labour are now starting to materialise.
Gower College engineering lecturer Calvin Williams (pictured) has designed and built a four-wheeled mountain bike known as Project Enduro. He decided to start the project, giving disabled people the chance to mountain bike, after falling from a cliff and suffering leg injuries in 2004
His endeavour is called Project Enduro, an initiative supported by the Welsh Government through European Regional Development Funding.
THE THREE-WHEELED ‘JUGGERNAUT’ BIKE
Called the Juggernaut, this $2500 (£1,500) bike can ride with ease across snow and ice, and also across curbs and steps.
The father and son inventors claim its two front wheels give the bike far more stability.
The idea came from experiencing the challenges of carrying a surfboard on a bike with a surf rack to a local surf break and having to dismount to push the bike up stairs and through deep sand, the firm said.
The company experimented with several designs, and now Rungu Trikes roll through deep sand and up short flights of stairs.
Enduro has the goal of designing and manufacturing a prototype four-wheeled mountain bike.
This is predominantly for use by disabled people – although it seems others aren’t disqualified from enjoying the bike either.
It has no pedals, with the ‘rider’ instead sitting in a seat between all four wheels.
A set of handlebars then allows them to steer as they make their way down a course.
The bike is built with carbon-fibre seating and top-end suspension.
Its aim is to encourage extreme sports enthusiasts to grasp the concept of ‘gravity biking’ – cycling at top speeds downhill.
The first prototype was unveiled back in February, and the team have now been testing a second prototype in Snowdonia, north Wales.
The second builds upon the design, comfort and safety issues identified in the first.
And Project Enduro is beginning to make an impact on the extreme sports market.