The light-weight, efficiently simple, interchangeable expanding gear system for bicycles.
The system eliminates:
- Chain droppage due to changing between discrete chain-rings.
- Chain wear due to rubbing and friction of front derailleur.
- Chain stretch due to small to large gearing differences between front and rear gears.
The system allows a rider to
- Change gears as quickly and easily as standard chain-ring/derailleur systems.
- Choose among five crank-mounted gear settings from 24 to 44 teeth equivalent.
The system could easily be adapted for both front and rear gearing applications.
What is different about VECTr:
Expanding chainrings have been around for over 100 years, but they have been complicated and so, heavy and expensive.
The weight of the current version of VECTr (in steel) compares quite favorably (500 g) to the triple chainring and derailleur it replaced (475 g). When VECTr is commercially manufactured, its weight certainly will be reduced.
When compared with other in-line transmissions with regard to weight versus cost, VECTr is clearly superior:
|VECTr||$150 – $200||525g (steel)|
|Patterson Drive/FSA Metropolis||$300||1734g|
|Rohloff Speed Hub||$1100 – $2000||1700g – 1825g|
|Shimano Alfine 8sp||$360||1600g|
|Shimano Nexus 8sp||$280||1500g – 2000g|
|Schlumpf Mountain Drive||$700||1080g|
|Sturmey Archer SRF5 5sp||$181||2010g|
The reliability and performance of VECTr is being improved as the design is modified and tested. It will outperform triples in having more gear settings, and in maintaining a consistent chainline. It is more complicated (six moving parts) than triples (one moving part (the derailleur) and three relatively stationary chainrings). But, this is offset by the greater reliability of preventing dropped chains.
If you are interested in learning more, or being notified of updates, e-mail us at firstname.lastname@example.org.