Variable head angle bike: the theory

Variable head angle bike

a new innovation in biking at  

Bespoked 2017

it allows the rider to alter the geometry on the move.

by having a rotational headstock with its centre of rotation  in front of the bike and directly over the front axle, the effect is 3 fold

as you decrease (slacken) the head angle :

1 – you extend the wheelbase – which gives increased stability downhill

2 – you extend the fork in relation to the frame – maintaining the same frame height and the same attitude to the ground.

3 – you shift centre of gravity rearwards

 

here are three scenarios:

DOWNHILL RIDING 55-60 degrees

55 degree variable angle headstock wooden mtb.jpg

a slack angle 55-60 is best for downhill: a longer wheelbase gives more stability as it keeps your centre of gravity more rearward

with the weight shift rearwards and the bikes height remaining roughly the same it prevents you feeling you are about to go over the bars.

 

FLAT TRAILS  60-65 degrees

60 degree head angle variable angle mtb.jpg

general riding relatively flat tracks, enduro and jumping, is best done with around 60-65  degree head angle:

 

CLIMBING – 65-70 degrees

65 degree head angle variable angle mtb.jpg

the natural inclination when climbing is to get out of the saddle but this loses efficiency if you do : for climbing use  a steeper angle 65-70 degrees and you wont need to.

it gives you a shorter wheelbase and makes you go uphill faster – and around 2 gears easier. A shorter wheelbase transfers centre of gravity forward saving having to get out of the saddle.

 

a European Union  EUIPO registered design and patent pending

framebuilders who wish to use this design simply contact pjcharnaud@gmail.com