lnanek
10 kW
- Joined
- Sep 26, 2022
- Messages
- 694
Tony01 said:Front hubs are a bad choice.
lnanek said:Don't ebikes with carbon forks tend to have much thicker ones than the one in the OP? E.g. Luna's:
23t32t-min-1.jpg
And that's not even a front hub model. So all that thickness is just to handle the speed from the middrive. I'd expect a front hub carbon fork to be even more reinforced.
tomjasz said:Tony01 said:Front hubs are a bad choice.
That’s just silly. They have their place. My front GD and a DD are veritabl3 tractors and have thousands of grocery hauling miles on them. I have 4 other mid drive bikes but for simple builds a front drive motor is a great option for many. I really like the regen braking on my DD front trailer pulling “tractor”. Powerful and effective braking.
ZeroEm said:Front hubs are useful, Trikes, Snow, Sand, etc.....
tomjasz said:That is one fugly ride.
https://lunacycle.com/lauf-carbonara-carbon-fat-fork/Full Composite suspension fork for fat bikes.
Zero maintenance fork by removing all "moving parts", virtually removing upkeep.
Military spec S2 glass fiber.
60mm of travel with progressive spring rate
by Tony01 » Dec 18 2022 8:24am
They’re only useful if you are going very slow. In an ideal maximum acceleration situation there would be no weight on the front tire. Nobody is really riding in the sand all the way to work or hauling their groceries in the sand. On snow you have limited traction and a front hub steals some of it that you really need for steering. The only time they’re useful is if you have a few underpowered setups and want to increase your load capacity by adding a front hub to an existing rear hub setup.ZeroEm wrote: ↑Dec 18 2022 8:11am
Front hubs are useful, Trikes, Snow, Sand, etc.....
But, if I was running a trailer I’d run rear hub and trailer hub(s), and setup a delay on the trailer for throttle and delay on the bike rear hub for regen.
Thank you for your adviceChalo said:I would avoid putting in the "idiot washer" hole, because it takes out material that's under high tensile stress when the axle is trying to pry the slot open.
Also I'd orient the slot facing forward, so reaction forces from the disc brake aren't in the same direction as the slot opening.
And if increase the width of the material around the corners of the axle slot. Have a look at open end wrenches for well iterated designs that do the same kind of job.
avandalen said:So it isn't mandarory?Chalo said:>>>> That's a CPSC requirement for bikes, not forks. Lawyer lips aren't the only way to fulfill that requirement; they're just the most annoying way that's hardest to get rid of.
Not for forks. It's also at odds with what you're trying to accomplish in terms of compatibility with a range of hub motors.
If you make both sides with identical IS disc tabs, then the right side can be used to anchor a torque arm (which you can also make and sell). Or silly people can put together dual disc setups.
Even if you don't do that, you should incorporate some mounting point that can be used for a torque arm. Best if it's also able to serve another purpose, for instance a fender mount, rack mount, or disc tab.
My carbon fork is for hub-motors with a 12mm axle, for very large hub-motors, weight saving no longer makes sense.Chalo said:amberwolf said:I don't know that all the front motors have only 12mm "tall" axles...I'd have to research that.avandalen said:I think, that all hub motors for front forks have axle diameters of 12mm with a flat side of 10mm (also 1000W motors) else they will not fit to any fork.
I have a Leaf front motor with a 14mm axle. I have a Crystalyte front motor with a 14mm axle.
It's easy enough to provide a fork tip that will work equally well with 12x10, 14x10, and 16x10mm axles.
Not for e-bike motors up to 250WTony01 said:Front hubs are a bad choice.
avandalen said:This is another demonstration of my (lightweight) Maxun One solar bike
E-HP said:avandalen said:This is another demonstration of my (lightweight) Maxun One solar bike
Well that's great video. Short, but clearly demonstrates a proof of concept. In order to study it more carefully, you can turn the speed down in the YouTube settings to 0.25X. I detect some sinusoidal oscillations at around the 5 to 6 second mark. Maybe due to the flexing.