Graeme Obree has made some tweaks to his human powered vehicle, known as The Beastie, ahead of his attempt on the HPV world speed record in the USA.

The Scottish former world champion and hour record holder made the decision to alter the gearing on The Beastie ahead of today’s riding session at Battle Mountain, Nevada.

Obree stripped the shell from The Beastie to change the primary drive sprocket from a 17-tooth to 12-tooth. This increases the gear to approximately 290 inches, the same as for his initial runway tests.

Obree has also added 300-grammes worth of balancing weights to the wheels to aid The Beastie’s stability at speed after it lost its line during Monday’s initial session.

Obree rmoves the shell to get to The Beastie’s innards

Looking through the shell of The Beastie

Swapping the primary drive sprocket

Graeme Obree getting to work

Adding balancing weights to the front wheel

Checking wheel balance

The Beastie in action earlier this week

Related links

Beastie Blog part three

Beastie Blog part two

Beastie Blog part one