Introduction: Gravitybike HQ

Brett Phillips - Gravitybike HQ

A Gravity Bike is a specialised two wheeled bicycle propelled by nothing other than gravity. Without pedals or a chain, Gravity Bike riders rely on steep gradients and gravity to reach incredibly fast speeds. Historically, Gravity Bikes evolved from modifying a traditional BMX where a rider would add weight, alter seating and handlebar positions and change a bikes aerodynamic characteristics in the pursuit of greater speeds. More recently, Gravity Bikes have evolved to become highly specialised and purpose built machines capable of reaching speeds over 130kph from a standing push start.

Gravity Bikes are ultimately built for speed. The steeper and more technical a road or dedicated racing circuit, the greater the adrenaline rush for riders. Fitted with full protective gear including leathers, helmets, gloves and boots, Gravity Bike riding combines the thrill of speed with a love of bicycles.

In 2009, I designed and built this purpose built and highly specialised Gravity Bike. The first of its kind, the bike is a quantum leap in Gravity Bike design and fabrication. The bike is a combination of hand fabricated and CNC (computed numerically controlled) components. The bike was designed from scratch and had to accommodate existing components such as 20'" wheels and mountain bike brakes. The bike has reached speeds of 136kph from a standing push start and assisted me to win the 2009 World Gravity Bike Championships. The only Australian to do so to date. I hope you guys like the build!

For more: www.gravitybike.com.au
 

Comments

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IndexGlobal made it!(author)2016-08-29

Hey guys! Test your builds out with Global Speed Index to get your speed, and check other Gravity Bike Gear and riders from around the world. Global Speed Index is an App for Gravity Bikes and Action Sports. Check it out @ http://www.GlobalSpeedIndex.com - one you register, get a free month subscription to PRO Services, just send us a message via Contact Us in settings screen with GBIKE in the body. Happy building, and happy riding!

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cedric.royblanchard made it!(author)2015-05-01

What are those 6 pistons brakes?

Great project by the way!

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ZacharyL2 made it!(author)2015-02-03

so who made the very first gravity bike??

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ZacharyL2 made it!(author)2015-02-03

so who made the very first gravity bike??

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The+nerdling made it!(author)2012-12-26

i see your in australia, do you know lithgow?
if you do, there is a huge steep windy highway there, which would be great for this, but, there is a cliff on the edge, not too high but still a cliff

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jeffconnelly made it!(author)2012-07-26

"The first of its kind, the bike is a quantum leap in Gravity Bike design and fabrication."

You're probably going to want to change that. A quantum leap is the smallest measurable change.

Atomic Electron Transision 

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Aron313 made it!(author)2012-05-19

Can you say it in mph?

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Bjorgulf made it!(author)2012-07-09

just divide by 1.6 ;)
or multiply with 5/8 if that suits you better

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Aron313 made it!(author)2012-07-12

Ok thanks.

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Oldbear made it!(author)2012-07-08

Odd question - but do you have to counter steer at a certain speed? (my motorbikes have been anywhere from 25kmph to 35)

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mr+fat made it!(author)2012-04-06

Is there any gravity bike racing in Queensland?

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Dedlee made it!(author)2011-09-08

I want to find someone to build me a gravity bike. As of now I ride a BMX doing downhill. Any suggestions?

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gravitybike made it!(author)2011-09-11

Hey Dedlee
shoot me a email at brett(at)gravitybike(dot)com(dot)au and we can have a chat about it! cheers Brett

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Simba8400 made it!(author)2011-10-02

how much would you ask for one built just like that?

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afleming2 made it!(author)2011-10-01

looks comfortable

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calcooper5 made it!(author)2011-06-22

This would be cooler if you put up some instructions on how to build this bad boy

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evindrews made it!(author)2011-08-27

there IS one.
https://www.instructables.com/id/Gravity-Bike/

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calcooper5 made it!(author)2011-08-28

ive seen that one but it is a completely different grav bike. i would love to build THIS one

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tyoung6 made it!(author)2011-07-27

whats the song

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TheMaker888 made it!(author)2011-06-22

dont get pulled over for speeding mate haha
nice bike too, you build it?

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russvan made it!(author)2011-06-09

that is amazing

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TwistyTIE made it!(author)2011-06-08

oh my that design is just asking for a small bike engine to be put on it :P

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Ceiling+cat made it!(author)2011-05-23

I love that you're wearing Converse high-tops in the video. Probably some of my favorite shoes. I've been wearing mine a lot lately.

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gravitybike made it!(author)2011-05-23

Hey CC, they are the best shoes and have followed me all over the world on the bike! :)

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rimar2000 made it!(author)2011-05-20

WOW! That is wonderful! It is a pity that my area be totally plain.

The bike seems very strong. Good design.

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notingkool made it!(author)2011-05-20

muy diferente a la planilandia de La plata, no se puede andar ni en patineta, por el empedrado.

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rimar2000 made it!(author)2011-05-20

Sí, la pendiente más alta y pronunciada que tengo a 200 kilómetros a la redonda es el acceso a la autopista...

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notingkool made it!(author)2011-05-20

jajaja, es verdad. Aunque descubri que todas las calles son planas hasta que te subis a la bici y te das cuenta que estan todas en subida.

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notingkool made it!(author)2011-05-20

is awesome, i wish i live in a place with that road. it's ideal to longboard and to back home without efford