Under compression the top run of the chain lengthens and something has to give...if your cranks don't move backwards your sprocket has to rotate forward to "feed" the top run,thus engaging the freecoaster.
Yes, BB-to-rear axle distance change is the cause of chain pull. Here, the rear wheel is virtually rotating backward. However with the standard freewheel mechanism; rear wheel rotating backward forces sprocket to rotate backward, too. The sprocket with wheel are the fixed end and crankarms are (always) free end. Hence, the missing chain length must be taken from the chainring.
But if we "un-lock" the sprocket from the rear wheel; sprocket doesn't rotate with wheel, missing chain length might be taken from the sprocket. Sprocket would become more free than crankarms because of rider's feet pushing against the crankarms. This is how I think about it.
Click to expand...
My understanding is that freecoasters engage when the sprocket is doing the "driving" an disengage when the wheel is "driving"(in either direction).
Seems to me now that the engage/disengage action would also be quite variable due to changes in gearing sizes/ratios.
If you combine this with the suspension cycling,a chain bouncing round, wheel rpms rapidly changing and a changing bb to axle distance, you would have a freecoaster that doesnt know whether its coming or going.
Aluminum BMX MTB Freecoaster Hub-Alloy MTB Dirt Jump Bicycle Hub
PRESS RELEASE: Neoride Components
MTB is known for many continuous tech revolutions. Unfortunately the Freestyle MTB industry is put aside. The major upgrade we saw in a long time was the mechanical gyro, coming from the BMX world. Most riders on the FMB World Tour now run this [more or less artisanal] system that allows the bar to rotate without any limit.
The other recent big change we saw on the slopestyle scene was freecoaster hubs. “Freecos” have also been around in the BMX world for a very long time. They started to show up in the MTB industry a few years ago, but recently they came back as some big names on the slopestyle scene started to ride them.
Freecoaster hubs allow to ride backwards without having the cranks turning. They offer great opportunities to do new tricks that cannot be done with a traditional freewheel hub, either in slopestyle, Skatepark or street riding.
At Neoride Components, we focused on the development of a new freecoaster hub that would be perfectly adapted and optimized for Mountain Bike. We just launched it.
The final weight and durability were big challenges when building a coaster for MTB. Considering the disc mount space and the final 135x10mm standard dirt jump hub size, there was little room left for the freecoaster mechanism. That is why the best option for it was the "pawls & springs" configuration.
Thanks to the springs in the driver, the pawls are forced to retract when you stop pedaling, which allows the hub to rotate freely when riding background. Then when you pedal again, a clutch engages the pawls back on the ratchet ring.
As some slopestyle riders run a MTB crank with a big chainring, and some ride a 3 pieces BMX style crank with a smaller chainring, we had to offer 2 options. That is why we came up with a one piece driver with 10t, and a two pieces driver with a 14t sprocket (that can be changed for one from 12t to 16t).
The clutch can be changed to have a smaller “slack” / “gap”. It changes the moment when the pawls are engaged, thanks to different angle designs.
The final version of the Neoride MTB Freecoaster Hub is ready. We just made the hub available for pre-orders with 25% off, at $139. Pre-orders run for limited time and quantity, and deliveries are expected for early August.
More information on our website here.
Must See: Radio teases MTB freecoaster hub, brings BMX tricks to slopes on Griffin & Siren
Radio Bikes’ new MTB, dirt jumping & slopestyle division looks set to adapt some uniquely BMX & freestyle tech up to bigger wheels, teaching mountain bikes some new tricks. Mostly centered around 26″ hardtail & full-suspension dirt jumpers, as well as bigger wheeled urban assault bikes, the tech that drew us in was a prototype lightweight MTB Freecoaster hub that allows Radio team rider Niklas Tilk to do some wild street riding on a big-wheeled bike…
Radio MTB Freecoaster, freestyle tricks on a mountain bikes
We kind of always knew Cologne’s Radio Bikes as a Freestyle BMX company before they more recently expanded also into proper BMX racing. But the rider-owned company always like to play on the trails too, so it isn’t a big surprise that their dirt jump & trail riding habits started to bleed over in to bike development, too.
As to that video, like Radio’s head of Product Development Dave Paterson says, “it’s not often you see a guy on a 26″ bike riding like this!”
This MTB Freecoaster project that Tilk is riding, opens up interesting possibilities for riding urban freestyle on a full-sized bike, but also has a lot of potential when you think about the type of tricks riders are laying down at big slopestyle competitions, or even eventually bigger events like Rampage. Imagine someone dropping in off a cliff in the Utah desert to land backwards!
MTB Freecoaster tech details
c. We Make Things
For those any less initiated in the Freestyle culture than I am, a freecoaster basically is a freehub that disengages its clutch mechanism in both directions so that you can roll, coasting both forwards & backwards without any kickback at the pedals. It then still will re-engage when you pedal forward again. Most variations allow some kind of adjustment of the slack to control how much you have to pedal forward before it engages again.
Now besides already making all manner of BMX bikes, Radio is also part of the We Make Things collective of bike companies that stretches from all-terrain Bombtrack to We The People & Salt BMX, where they’ve already refined the WTB BMX Helix Freecoaster hub (above). But it’s not as simple as respacing a BMX Freecoaster, Radio wanted something more appropriate for a mountain bike.
Radio MTB Freecoaster prototype
And that’s where you get this prototype MTB Freecoaster that Radio has been developing and that Niklas Tilk has been thrashing around town. They say it is significantly lighter and more adjustable than the Helix, which makes it more suitable for mountain bike slopestyle & dirt jump riding.
2020 Radio Griffin Pro
Inside it has an all-new freecoaster mechanism that Radio has developed that they claim functions more “like a regular cassette hub but with a much larger (but adjustable) slack setting than other freecoasters”. Presumably using pawls vs. a BMX-style clutch mechanism, Radio claims the new, lighter MTB Freecoaster is actually much stronger, which was necessary with the additional forces from the larger diameter wheel.
The hub Tilk is riding is still a prototype, but Radio says the production version, as well as the 26″ Griffin Pro frameset he’s riding (above) will be available to consumers in early 2020. What kind of new tricks will you be bringing to the local skate park, dirt jumps, or even bikepark in the new year?
More 2020 Radio mountain bikes coming soon!
Beyond the new MTB Freecoaster that Tilk has been shredding on the 26″ alloy Griffin Pro dirt jumping bike, Radio has a bunch more new 2020 mountain bikes starting to drop. This one in the air (above) is their concentric pivot, single speed 26″ full-suspension alloy slopestyle & dirt jump bike called the Siren, with 100mm travel front & rear.
2020 Radio Siren
We don’t have that much more detail about Radio’s expansion deeper into mountain bikes for 2020 – like spec, pricing & consumer availability. But our attention has been piqued, so rest assured we’re going to find out more, and share…
Freecoaster hub mtb
.URBAN MTB FREERIDE AND THE FREE COASTER GEAR HACK!
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