YOU know the Haynes Bike Manual, the essential, go-to book for cycling enthusiasts.

Well it's not exactly portable, is it?

You can't just pop them in your jersey pocket and pull them out when you suffer a mechanical.

Well now there's a solution.

Haynes has teamed up with BikeRadar to create what it calls 'the ultimate Road Bike Manual app for true cycling enthusiasts'.

From the wheels to the cockpit, drive train, frame care and brakes, the app provides essential how-to information and advice for maintaining a road bike. Packed with handy information and pointers, plus invaluable roadside fixes, it features instructional videos that provide advice on how to fix a bike when it all goes wrong but the tools or parts required to fix the problem properly aren’t available.

Chaz Curry has more than 30 years’ experience working for and with Tour de France yellow jersey holders, world champions, Olympians, world record breakers and countless elite athletes. He wrote the app’s content and said: “In producing this app, I was keen to convey the techniques and ‘trade craft’ that have taken over 30 years for me to learn.

“Whilst most online content gives the user instructions on how to complete a project, they rarely highlight the finer points that allow you to complete the job efficiently and to a professional standard.

“By passing on this knowledge, I hope that the user will have the confidence to take on any of the tasks that I have covered in the app and come to enjoy fixing and maintaining their own bicycle themselves.”

Available now for tablets and smartphones, The Road Bike Manual App can be downloaded for £2.99 from the iOS App Store and Google Play Store