Mounting TWO freewheels on one rear wheel hub

[TylerDurden]

The hub of most interest here is the SRAM Dual-Drive: it has internal gears and a splined freehub. The freehub has enough space for two freewheels, so neither the cranks or the motor need freewheels... that also means no spinning chains when one or none are driving the hub.

 

[AussieJester]

The hub of most interest here is the SRAM Dual-Drive: it has internal gears and a splined freehub. T

TD have you seen the internals of these SRAM hubs at all? are they similar to the shimano 3 speeds and SA 3 speeds? If they are similar i hold VERY VERY little hope these fellas being happy with them.

http://endless-sphere.com/forums/viewtopic.php?f=28&t=14533&p=224872#p224872

KiM

 

[sona1111]

the motor i'm using is low power, like 250W or something. I dont think the gears would have that kind of damage (in the other thread), the reason to use the gears in the first place would be to get more top speed. If i do end up getting a more powerful motor, i would most likely mount it near the cranks, with the freewheel crank setup, so i can keep them both. (redundant but whatever)

 

[RWP]

So I just made one of these:





Started with a wasted freehub and a 1.5" aluminum rod. Ground off the splined part of the freehub to get at the races and inner part of the pals - and machined threads (my first threads on a lathe) and bored out to fit freehub innards.
Freehub innards press fit into aluminum, red loctite, and final screw of freehub race to secure.

I have a concern that I did not make the interference fit tight enough, .002 thou, and that the aluminum will spin on the steel freehub innards. The innards are a press fit and the end race that screws onto main part of the innards also pinches a boss I cut into the aluminum bore. What do you guys think?

Took ages to make - I am sure a trained machinist could make this thing in a half hour or so.
I posted same as above here: http://www.endless-sphere.com/forums/viewtopic.php?f=28&t=22592

 

[scouser-nick:)]

thins could be usefull!

 

[StudEbiker]

Any chance of getting the pictures in the first post re-upped??

 

[spinningmagnets]

I was digging through old posts to find info I want to save for my personal files, this one is definitely a saver for non-hub 500W-1000W builds:

Ebay link to the flanged ACS-Crossfire freewheel from BikeMotive ($17 + shipping), stronger than the Dicta, not as expensive as the ENO. I might suggest mounting the ENO next to the hub for the motor to drive it, and the lower power pedal chain be driven by the ACS in the outer position.

http://www.ebay.com/itm/ACS-Crossfi...Cycling_Parts_Accessories&hash=item4abe8ce650

Here is the link for the heavy-duty "White Industries ENO" flanged BB-freewheel from "Sick Bike Parts" ($70 + shipping). It is a little louder with its clicking sound, but the bearings are a separate assembly that can be cheaply and easily replaced without replacing the entire FW. This is the one that's recommended for high-power applications:
http://www.sickbikeparts.com/catalog/product_info.php?products_id=62

 

[spinningmagnets]

"Problem solvers" makes a variety of adapters for bicycles. There is a certain kind of bike that has a bearing cup that is made from plastic and it breaks. PS makes an aluminum replacement, about 17 threads long. The Freewheel thread of "1.37 X 24 TPI english" (as opposed to the slightly different Italian thread of a similar number) is part number CR5468.

 

[Thud]

Spinning magnets,
a little clarification: Any freewheel that has a reduced diameter at the reomoval tool contact points can not be "stacked-threaded" onto a feewheel.....

if you look at the dicta below, the treads are accessable from either side of the unit.
the Cross fires & Eno's would have to go on the outer most position as the threads are blocked without serious modification.


& the Eno is only a high power replacment under pedal for the trial's riders...It has a single ball bering cartrige that makes it a far poorer choice for a freewheeling crank set up....as a driven sprocket ...it is king. 2 rows of angular contact bearing make the cheaper freewheels better for free-wheeling as it were.

also, both e-tard & I have broken this set up..catostrophicly....(I went over the bars when I stripped the outer freewheel off one set up).

I still offer free broaching of the crossfires if any one wants to run 2 freewheels onto a freehub set up. JUst send me a freewheel & a package of cut-off wheels & I'll take care of ya'll.

example installed:

referance thread:
http://www.endless-sphere.com/forums/viewtopic.php?f=28&t=37640

 

[crossbreak]

"Problem solvers" makes a variety of adapters for bicycles. There is a certain kind of bike that has a bearing cup that is made from plastic and it breaks. PS makes an aluminum replacement, about 17 threads long.

The cup that comes with the cheap but well made "BBS 15" SunRace BB is made of steel. Use at least one on all of my bikes It has 15 threads.

i talk of this one: http://www.sunrace.com/en/products/detail/m90?sku=BBS15

Best thing is: You can insert BB bearing for support.


About the Motorfreewheel+5-speed hub: One has about 40.5mm of space for a cassette with normal 135mm threaded hubs like this one:


A 5-speed hub should be 24mm wide, a freewheel is 16.5mm, it's a close thing though. Just one washer could solve this I guess. Bending/widening the frame for only 1mm is absolutely no problem. Just need someone who owns a 5-speed freewheel and measures the exact thickness.

 

[windtrader]

This is a pretty old thread but still interesting.

What kind of builds benefit from running the drive to the right side other than maybe multi gearing if the hub was an IGH?

Seems like this not very desirable since a high power motor running through the hub could blow it up in the case of IGH. If it is a single gear than one could just run a left side sprocket with a machined adapter to clamp the hub to the sprocket.

 

[crossbreak]

left side drive has drawbacks as well:

The brake disc may get oiled by the chain
The swing arm may interfere with the chain on some frames

 

[bionicon]

http://i32.photobucket.com/albums/d10/tmoto/P3110147.jpg

I need the same freewheel somebody can help me?

thx

 

[Thud]

Bionicon: I cut the ASC freewheels to slip onto a free-hub
Send me a freewheel & a package of dremel cutting discs & return postage & I will hook you up.

Details here:
https://endless-sphere.com/forums/viewtopic.php?f=28&t=37640

 

[fourbanger]

Uh... So, Thud... could you elaborate a little on you and yours "catastrophic failures"? Cause if the outer freewheel slipped off then it sounds to me that it did so under pedal power.. Am I wrong?

V.

 

[Thud]

It was a low speed over the bars as I was pedaling between 2 parked cars in my driveway.
I stepped on the pedal & sheared the tread extension on the outer(pedal)freewheel.

I am sure it looked quite comical as it was a perfect over the bars-full tuck somersault.
luckily years of moto-crossing has me programed to fall down correctly when inevitable.
no injuries.

 

[bionicon]

Thanks to Thud , i have my freewheel and it fits well