https://www.cyclingabout.com/chainless-shaft-drive-bicycles/
Friction Facts have tested a singlespeed chain to be about 99% efficient at 150-watts (2-watts drag), and a belt drivetrain to be 98.6% efficient (2.45-watts drag) at 250 watts power output. Using this current data, it would mean a shaft drive is around 92% efficient (12-watts drag). That said, chains and lubricants in the early-1980s were not

https://www.youtube.com/watch?v=eimLIkJaNFM
It's time for us to investigate the world of SHAFT DRIVE bicycles! 📘 The Bikepacking Bike Buyer's Guide: https://www.cyclingabout.com/bikepacking-bike-buyer

https://www.cyclingabout.com/are-chainless-string-drive-bicycles-a-genius-or-terrible-idea/
To prove that String Drive is no gimmick, Ferenc Szonyi (an ultra-endurance cyclist) used this drivetrain in the insane Race Across America, a non-stop 4,800 km cycling event (3000 mi). In just 11 days and 10 hours, the athlete on the String Bike completed the route. That's a crazy 422 km (or 262 mi) per day! Of course, there are downsides to

https://wheretheroadforks.com/the-chainless-bike-is-the-shaft-drive-bike-the-future/
Inefficient- Shaft drives are about 7% less efficient than chain drives. Compatibility- The only type of gearing you can use with a shaft drive is a geared hub or single speed. Derailleurs aren't compatible. Weight- Shaft drives are 1-2 kg (2.2-2.4 pounds) heavier than chain or belt drives.

https://www.youtube.com/watch?v=doKhd8kE0Ow
String Drive is a chainless bicycle drivetrain that uses ROPES to propel you forward! 📘 The Bikepacking Bike Buyer's Guide: https://www.cyclingabout.com/bik

https://discerningcyclist.com/shaft-driven-bicycle-chainless-bikes/
A shaft-driven bicycle uses rotational gears to propel the bicycle as opposed to a traditional chain or belt drive system. Shaft-drive systems are used in the automotive industry and have industrial purposes too. The forces created by turning pedals are still translated into forward motion. A shaft-driven bicycle is unfamiliar to the eye.

https://www.cyclingabout.com/are-chainless-digital-drive-bicycles-the-future-of-cycling/
And on a slope, it gets even worse. A 5% gradient with a chain would have you cycling at 9.4kph, and you'll be cycling 34% slower with a digital drive (6.2kph). *80kg rider, 15kg bike. But keep in mind, these numbers don't take into account any energy captured by the drivetrain through regenerative braking.

https://www.solidsmack.com/fabrication/chainless-drive-shaft-bicycles/
Since all parts of a bike bend when sat on, the bike frame has to be sturdy enough to withstand very high loads. On top of the load capacity, the chainless drive shaft has to be able to mesh its gears effectively. The rear bevel gears also have to be easy to align, so as not to cause problems when installing the rear bike wheel. Proprietary Parts.

https://www.bikeiowa.com/Review/1590/a-quick-look-at-dynamic-bicycles-shaft-drive-chainless-bikes
Dynamic Bicycles out of Rhode Island has been producing a small line of chainless bikes for the past ten years. They have a few models of street bikes, a hybrid, and even a folding bike. Instead of a chain and standard dereailleur, the bikes feature a shaft drive (by Sussex) and internalgear hub (by Shimano, the same type used in some trikes).

https://www.gadgetexplained.com/2015/12/how-chainless-bikes-work-bicycle-design.html
A shaft driven system is actually quite simple in design. A shaft drive is essentially a mechanical piece that transfers power and in the case of a chainless shaft drive bicycle, it works by transferring power from the pedals to the rear wheel through a combination of gears, a shaft rod and bearings, all housed inside an aluminium enclosure to protect the components from the elements.

https://bicycles.stackexchange.com/questions/25235/chain-vs-chainless-options
With a carbon/shaft you can only run a single gear hub (maybe with internal gears, but that's not the point). A normal bike chain lasts a few years in mountain/road riding and keep in mind rear derailleurs play a huge part diminishing a chain life. On a single speed bike the chain pretty much has no wear and just lasts and lasts.

https://materialdistrict.com/article/driven-bicycle-worlds-most-efficient-drivetrain/
Email. 31 July 2018. In collaboration with the University of Colorado, the Danish company CeramicSpeed developed Driven, a bicycle with a carbon-fibre drive shaft that is said to be the world's most effect drivetrain, eliminating the need for derailleurs and a chain. According to CeramicSpeed, Driven creates 49 per cent less friction compared

https://en.wikipedia.org/wiki/Shaft-driven_bicycle
Dynamic Runabout 7 shaft-driven bicycle Drive-shaft housing. A shaft-driven bicycle is a bicycle that uses a drive shaft instead of a chain to transmit power from the pedals to the wheel.Shaft drives were introduced in the 1880s, but were mostly supplanted by chain-driven bicycles due to the gear ranges possible with sprockets and derailleurs.Around the 2000s, due to advancements in internal

https://engineerine.com/the-gear-driven-chainless-bicycle-is-it/
Chainless Bicycle Building Process Source: Youtube / The Q. Chainless bicycles have been around for a while, but this is the first one that uses a shaft-driven mechanism. A drive shaft is used instead of a chain to deliver power from the pedals to the wheel on these bikes. In other words, instead of a chainring, it features a big bevel gear.

https://www.reddit.com/r/ebikes/comments/20dquy/lets_talk_about_chainless_shaft_drive_ebikes/
Theoretically a motor can access the gears through the shaft drive to provide torque much like a mid drive. But of the few companies that sell shaft drive ebikes, even fewer actually sell a bike that can do this. Most are selling bikes with hub motors. But you could have the simplicity of chainless with the torque of mid drive. Theoretically.

https://cycletraveloverload.com/chainless-digital-drive-bicycles-chainless-bicycles/
Yes, chainless bikes tend to be more efficient than chain-driven bikes. The elimination of chain friction in chainless bikes allows for a more direct transfer of power from pedaling to the wheels. This results in reduced energy loss and improved efficiency compared to traditional chain-driven bikes. The digital drive system in chainless bikes

https://cincyvegans.org/2013/05/?e=are-chainless-shaft-drive-bicycles-a-genius-or-terrible-ss-Ky5oLyF1
Are Chainless Shaft Drive Bicycles a GENIUS or TERRIBLE Idea? This Chainless Bike Is Still A Prototype, But It Could Change The Industry's Future Forever brand new handlebar uncut, ride old tyres, Oval chain ring, Light svcing no clunk Shift smoothly and ride like a size

https://www.bicycles.net.au/forums/viewtopic.php?t=2821
Chainless Bicycles wrote:Top 10 Reasons Shaft Drive Bikes Are Better 1. Smarter Gearing Our chainless bikes provide incredible gear range without greasy sprockets, chains and derailleurs. By combining Dynamic Bicycles’ innovative shaft drive with Shimano’s advanced internal gearing, our bikes deliver a full-range of gears to

https://www.digitaltrends.com/cool-tech/chainless-bicycle-without-chains/
Chainless is a new kind of bike that your shoelaces will just love. Take a closer look at this bike. Your eyes aren't deceiving you. This is indeed a chainless bicycle known as Chainless

https://www.cyclingabout.com/tag/shaft-drive-bicycle/
Are Chainless Shaft Drive Bicycles A Genius or Terrible Idea? Find out all of the reasons why shaft drivetrains have not succeeded in the bicycle world. by Alee Denham. May 29, 2021. Recent Articles.

https://www.southbayriders.com/forums/threads/166554/
Are Chainless Shaft Drive Bicycles a GENIUS or TERRIBLE Idea? Thread starter Andy; Start date Jul 8, 2021; Forums New posts Andy Wheelie for Safety. Name Andy. Jul 8, 2021

https://www.reddit.com/r/pedale/comments/nna5ko/are_chainless_shaft_drive_bicycles_a_genius_or/
Are Chainless Shaft Drive Bicycles a GENIUS or TERRIBLE Idea? - YouTube. comments sorted by Best Top New Controversial Q&A Add a Comment. Roujetnoir 🚵🚴‍♂️ • Additional comment actions

https://www.cyclingabout.com/belt-drive-better-than-chain-drive-bicycles/
The first is with regard to the drive efficiency on worn chains and belts. The data suggest that worn belts run more efficiently than worn chains after both 5,000km (100% wear) and 10,000km (200% wear). In fact, the belt at 10,000km was running more efficiently than the chain at 5,000km.