VECTr Is Already Ahead of the Big Boys

Posted: June 19, 2020 in Uncategorized

shimano patent appTwo of the Big Boys (the two biggest?) of bicycle component manufacturers, Shimano and SRAM, have both created quite a lot buzz with their patent applications for drivetrain components which would, in different ways, eliminate the front derailleur.

In January, the PTO published the patent application which Shimano filed for a frame integrated gearbox:




SRAM patent appAnd the application that SRAM filed for a crank mounted (not frame mounted!) derailleur was published by the PTO in May.

What I think this shows if that even the Big Boys realize there are inherent problems with the front derailleur on drive trains and that they have invested significantly in R & D and patent costs and fees to come up with creative, albeit super-complicated  ways around what has been a mainstay of bicycle transmissions.

The fact that these major players in the bike component marketplace are looking seriously at alternatives to the front derailleur has driven interest in VECTr.


20190925_212215VECTr similarly eliminates the front derailleur and instead varies the size of the front driving gear by adjusting crank mounted gear segments. This keeps the chain in a consistent chainline. Shimano’s gearbox would do this, but only by requiring a heavy, complicated mechanism built into the bicycle’s frame. VECTr achieves gear changes while being mounted on existing bike cranks/bottom brackets, components compatible with standard frames. SRAM’s device would seemingly do this too, but it would also itself be a true derailleur and push the chain between only two discrete chainrings. Moreover, it would do so by incorporating tiny servo motors, batteries, a radio receiver, a timing computer and who knows what all else.

VECTr’s very great advantage over these proposed alternatives from SRAM and Shimano is that it achieves the same or better result than the devices described in the patent applications with a very much simpler design, and no doubt, at a very much reduced cost. Plus, VECTr is already patented!

  1. George Fleming says:

    I admire your invention. Congratulations for earning the patent.

    Agree that the Shimano and SRAM devices are too complicated. The Shimano is also ugly, but Bike Radar is excited about it:

    One thing about your device makes me a little dubious: the constant acceleration and deceleration as the chain passes from one sprocket segment to the next. It would be most noticeable when the segments are at the maximum radius. I suggest that you commission an independent evaluation of this effect. Is it enough to irritate at least some riders?

    One other thing, how strong is your mechanism? For instance, Efneo does not recommend their front gearbox for mountain bikes or downhill.

    If neither of these points is a problem, I think you have a winner.

    I learned about your invention at


Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s