[–] Deathstalker 0 points 2 points (+2|-0) ago 

The bearing does not maintain constant contact:


Here is another view of my model


It's a marketing gimmick

[–] flyingcuttlefish 0 points 1 points (+1|-0) ago 

I worked in a shop that rented these shaft-drive bikes and they worked very well. The ones we had were casual use to ride through the park and were just 3 speeds (for non-expert riders). They had very, very low maintenance. And the drive/gears held up well to lots of use.

We used a bike made by Serotta, not around anymore - but it was similar to this - http://www.webbicycle.com/bikes/

If you need to rent bikes or provide a sturdy bike to riders who hate shifting gears etc. this is a good invention.

[–] carlip 0 points 1 points (+1|-0) ago 

this is like 12 years old. at least the first I saw something like it

[–] slwsnowman40 0 points 1 points (+1|-0) ago 

The move towards a chainless bike is seen as a worthy goal for bike manufacturers, given the problems many cyclists have with chains.

I just did about 20 miles, at >15mph, I didn't have any problems then. In fact, I hardly have any chain problems. The biggest problem with my chain I have is going from big ring to small ring during left foot downstroke - but that's more of a frame and timing problem than chain.

[–] ardvarcus 0 points 1 points (+1|-0) ago 

This thing isn't going anywhere. It's not as simple, as cheap, as light, as strong, or as easy to service as a chain over cogs, so it will be just another innovation that didn't do anything more useful than what already exists, and didn't do it as well.

[–] derram 0 points 0 points (+0|-0) ago 

https://archive.fo/2vcNI :

Dutch firm unveils prototype cycle driven by high-tech shaft that spins back wheel | Daily Mail Online

'The prototype uses a pedal to turn a horizontal shaft containing 21 bearings which in turn powers the back wheel. '

'A recent design was unveiled with a 13-gear system similar to a conventional bike. ', "CeramicSpeed's system is connected by a carbon-fibre shaft, which turns 90 degrees from the rear wheel and pedals."

'A US-based start-up recently launched a new bike with the pedal fitted directly on to the back wheel. '

'The system, called Driven, is one of a series of developments in recent years intended to find an alternative to the traditional chain. '

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