The hub is different than any other unicycle hub. The hub body is on bearings and is able to rotate around the axle. In that sense the hub is like a bicycle wheel hub that spins on an axle.
The cranks are attached to the axle. There is a jackshaft (the two cogs above the hub). The chain from the cranks drive the jackshaft. The second chain from the jackshaft then goes down and drives the hub. So the hub is able to spin at a different RPM than the axle. That is what allows for gearing. It can be geared up or down based on the size of the cogs.
I hope that makes sense. It's hard to explain without pictures.
ahh i get it now.
i wasn't sure how the other crank spun at the same time as the other crank. that would make sense.
thanks
-- iridemymuni
Evan Byrne said:
hope you like my super crappy present, but hey, you said you needed a wrench.
~~hold bananas and chug counterfeit tobasco for christ~~
Your projects are looking great, Pete! They are very impressive.
unisk8r said:
I bet Dave Stockton would duplicate this for anyone interested...and I'd also bet he could do it for less than I would. 🙂
That's the goal, Pete. At the moment, I'm working through some bumps in the road. Well, more like NYC potholes that you could lose a tour bus in. 🙄 So the geared projects are on hold for a little while. There are some cool innovations in the works though!
tomblackwood said:
Would that be Dave Stockton from LiveWire Unicycles?
I thought that Pete's PurplePhaze had less backlash than either my internally geared hubs or Florian's. His jackshaft design has really panned out to provide tremendous flexibility with gear ratio choices which are quite limited in internal designs. Hearing that the backlash on RedMenace is even less is good news, too. The massive Coker wheel and tire are only advantageous with geared unicycles in my opinion. It seems to add an element of stability. The addition of a disc brake makes it a complete, flexible, high-speed touring machine. Congratulations, Pete. I hope Dave cranks them out sometime in the future.
You taught me very well, Greg! I will never again build a prototype that cannot withstand your monumental running start torque! The Phaze prototype may have only lasted 2 seconds in your hands, but NEVER AGAIN! You will soon fear the strength of The Red Menace...in fact, it would take a congressional hearing to stop the spread of this wicked machine! MMWWWAAAAAHHHHHH!!!
Best bump ever. I also missed this thread the first time around. I am mad jealous, it looks amazing!
I know that this uni does not shift on the fly, but how do you change the gearing on it, and how long does it usually take you to change the gear ratio?
---unicycle for Bilious - The Oh-God of hangovers--- Make crumbs not War! www.unicyclepics.co.uk Get your pics out! www.Dreadworx.co.uk For proper natty dreads ------------------------------------------------------------------------ MrBoogiejuice's Profile: http://www.unicyclist.com/profile/5515 View this thread: http://www.unicyclist.com/thread/52571
The gear ratio is changed by loosening the chain tension, pulling out the jackshaft, changing the cogs, and also pulling the right crank and changing the crank cog accordingly. The two sides of the driveline are symmetrical. Same as on Purple Phaze. The process takes about 10-15 minutes, not really field-serviceable.
The gear ratio is changed by loosening the chain tension, pulling out the jackshaft, changing the cogs, and also pulling the right crank and changing the crank cog accordingly. The two sides of the driveline are symmetrical. Same as on Purple Phaze. The process takes about 10-15 minutes, not really field-serviceable.
No, not really field serviceable. But in a short period of time it can be set up for whatever ride you want. A wide range of gear ratios are available. This makes it extremely versatile. You're not just stuck with 1:1 or 1:1.5. How many gear ratios have you tried in your jackshaft design? How many do you know to be possible?
The lowest gear I've ridden in is 1.22 with 175mm cranks. A good climber would have little problem with hills in that combo. My climbing is still limited whether I'm on a guni or direct drive.
My best guess is that it would still have some perceptible driveline friction as compared to a direct hub, but in general riding around you don't really notice it. What you do notice is the lightweight wheel.
The lowest gear I've ridden in is 1.22 with 175mm cranks. A good climber would have little problem with hills in that combo. My climbing is still limited whether I'm on a guni or direct drive.
My best guess is that it would still have some perceptible driveline friction as compared to a direct hub, but in general riding around you don't really notice it. What you do notice is the lightweight wheel.
It's available for local test rides anytime.
I'll keep that in mind! Hopefully I can make it out to the Seattle area around/after Thanksgiving weekend to visit my Brother.
