Letting the cat out of the bag...........

[recumpence]

The crank will have a standard 130mm BCD bolt patern. So, the smallest chainring would be 39 tooth. I could add holes for 110mm BCD as well if I get requests for that. 3 chainrings can fit (remember, one chainring is for the electric drive). With freewheeling cranks, most people use one chainring for the rear drive and one for the motor. So, a dual drive hub system is best for more than 9 speeds. But, again, 3 chainrings is possible. As for Schlumpf drive, no, that uses its own crank. My system requires a freewheeling crank. Of course, you could choose not to use a freewheeling crank. But, then the cranks will be driven when the motor is running.

Matt

[Steven57]

So one chainring for electric freewheeling and 2 left for pedaling at 39+ and bigger ring?

[j3tch1u]

The crank will have a standard 130mm BCD bolt patern. So, the smallest chainring would be 39 tooth. I could add holes for 110mm BCD as well if I get requests for that.

Matt

yes, 110mm BCD plleeeasse (i need to run a 32T)!

[veloman]

My system requires a freewheeling crank. Of course, you could choose not to use a freewheeling crank. But, then the cranks will be driven when the motor is running.

Matt

And I've done a build like that. It takes some getting use to, but eventually you remember to let off the throttle 2 seconds before you might need to stop pedaling. It certainly can and will knock you off the bike if you aren't careful though. I'd highly recommend the freewheel cranks because coasting is one of the beauties of ebikes.

[recumpence]

The crank will have a standard 130mm BCD bolt patern. So, the smallest chainring would be 39 tooth. I could add holes for 110mm BCD as well if I get requests for that.

Matt

yes, 110mm BCD plleeeasse (i need to run a 32T)!

I will see what I can do.........

There is room on the adaptor for it.

Matt

[johnrobholmes]

Another vote for 110 bcd, I want to offroad!

[Steven57]

I'll ask a different way. With this setup will there only be one sprocket for electric and one for pedal?

[johnrobholmes]

That was matt's original plan I gather, but it sounds like there may be a way to have two pedal sprockets.

[recumpence]

Yes, at this point, I am looking at changing the drawings to accomodate two 130mm BCD chainrings and one 110mm ring. That would allow two pedal and one electric ring. I think this would be perfect. The larger pedal ring would be good for road riding and the smaller ring for lower ratio off-roading.

Matt

[johnrobholmes]

If this adapter is 3d already, you could machine the 110bcd on another plane to avoid using spacers for the other rings. Thoughts?

[recumpence]

There are no spacers. The electric ring is on the outside of the adaptor "Spokes" and one pedal ring is on the inside. They are spaced apart by the thickness of those spokes. Those are 130mm BCD, then one ring will be attached to a stepped area on the inside of those spokes.

Matt

[johnrobholmes]

You are ahead of my thinking already!

[ultima]

Yes, at this point, I am looking at changing the drawings to accomodate two 130mm BCD chainrings and one 110mm ring. That would allow two pedal and one electric ring. I think this would be perfect. The larger pedal ring would be good for road riding and the smaller ring for lower ratio off-roading.

Matt

Perfect! Where do I sign up? ...The small ring for off-roading was precisely the reason I was after multi ratio cranks. Any info on controller at this stage?

Regards,
Ben

[Steven57]

So, electric ring is all the way inboard? or outboard?

[recumpence]

I am most likely going to use a 6S Castle Creations controller.

The electric ring will be on the outside. That is actually dictated by the large diameter (56 tooth). You cannot run a ring that big on the inside.

Matt

[mabman]

I am anxious to see what comes of this but I have to say that a 56t chainring offroad is kind of sketchy. I use 32t 1x9 setups on my mtb's anymore and I still knick them once in awhile. I don't have any interest in this cat for that so it doesn't bother me, just sayin.

It would be interesting to see what Florian Schlumpf would dream up if he was tasked with making a freewheeling front crankset based on his 2 spd bb drive. One thing for sure, it would be expensive

[corkscrew]

This maybe exactly what I need for my next build... (Full suspension bike this time, a non suspended trike with skinny tires gets a bit bumpy over 30mph!)

Was there a price posted for the hardware only kit? (No motor, controller or batteries, but everything else?)

Running our own motor/controller, would there be a power limit that we should be aware of?

[recumpence]

The motor plate is being machined for the Maxx Products 6320 and 6332 motors. I have no idea what other motors use their bolt spacing.

I have no problem selling individual components, per-se. But, I would highly recommend running the motor it is designed for. I have done a lot of research for the perfect [ideal] motor. As for controllers and batteries, that is something that each customer can source if they desire.

Matt

[REdiculous]

The stock system will, most likely, come with a 56 tooth Origin 8 brand chainring.

Just saw that -- Origin 8 is a great choice. Can't wait to see it in action.

[MitchJi]

Hi Matt,

For use with an Astro 3220 the maximum reduction would be about 24:1 (17t and 95t pulleys with a 13t fw and a 56t chainring)? If so the output with a 7 turn (97 kv) 3220 at 44v will be roughly 150 rpm (97 * .85 * 44 / 24 = 151) which is pretty fast.

It might be a good idea to provide a way to attach 13t #219 sprockets to the FW and offer the kits with an Extron sprocket (72t-92t) instead of the Origin 8 chainring. That would allow a range of substantially greater reductions (easily over 30:1).

[deepfraught]

Best wishes for the kit, kudos for all the hard work.
Any weight estimates yet, or with parts used thus far?
Ditto the large chainwheel concern for offroad. 56T outboard may offer a nice large bash guard option/built in to counter that?

[adrian_sm]

Any updates. Keen to hear what is happening.

- Adrian

[recumpence]

I have been taking this project slowly. However, it is moving forward. I just recieved work from my motor supplier that my custom length shafts are being made. The FW cranks should be done within the next couple weeks.

Basically, I have had a couple major drive system clients that have taken up my time. Also, this project is an expensive one to develop. So, I am moving forward with it in steps to keep from killing my savings on it all at once. I also am making sure I cover all the bases on it.

I was hoping to have something to show by now. But, these things always seem to take longer than we expect.

This is my main project right now. The other projects I am working on are being handled by others on my behalf.

Matt

[Der Doktor]

How is the progress on your new system ? I hope things are working in your favor.
Will the system work with a bike frame like the one in the picture (my bike )?
The lower tube is about 60mm wide and more rectangular than round.
What will be the weight of the system, I mean just the extra weight (motor, gearbox, mounting parts)?

[recumpence]

Sorry about the long time to make this a reality. I have a number of irons in the fire right now and all of them are very involved projects. So, each one is kind of bogged down (time wise). Yes, the new drive should fit that frame without a problem.

Wait till you guys see the wicked stuff I (and others in concert with me) are working on. These projects are bigger than any one of use can handle on our own. I am utilizing the best engineers and machinists I know in their respective fields to achieve some phenominal results in 3 major projects. I can tell you that one of these projects will completely change the way you guys look at E-bikes.

It may take a while to realize all of these projects. But, every one of them is moving forward at a steady pace.

Matt