How to have 2nd freewheel on my bike

nobtiba

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Sep 8, 2024
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Singapore
Hi,
I am attempting to add a second freewheel to my bicycle in order to use a motor for assistance when needed. However, my bicycle has an aluminum frame, which does not allow for easy modifications like a steel frame would. As a result, there is very little space available to fit the second freewheel on the right-hand side.

20240401_182700.jpg


I have a freewheel adapter:
freewheelAdapter.png

There seems to be an issue: I'm unsure how to fit it into my current freewheel, as it appears there is no appropriate thread for it:
20240405_211552.jpg


I see online, they can fit the adapter into this type of freewheel:
Freewheel4Adapter1.png


and the hub to fit it is something like this:
Freewheel_nHub4Adapter2.png


but I am not sure which freewheel can fit my current freewheel hub and thread but also allow me to put the freewheel adapter in:
Screenshot 2024-09-10 at 6.35.08 PM.png


20240404_184851.jpg


Even if I can place two freewheels side by side, it seems that there is not enough space for them to move:
nospace1.jpg


If I want to follow option 1 and add the freewheel next to the current freewheel position, I need to find a very thin type of freewheel that can fit into the current hub and non-extendable frame. However, I have been unable to find it anywhere.

Option 2:
I am thinking about moving it to the left-hand side. So I remove the current disc break to get space for it. (I plan to replace it by a V-break):

20240401_182814_DiskBreak.jpg


remove the disc:
20240402_151158_Cok.jpg

then I bought a left-hand drive freewheel so it can operate on the left-hand side.

The issue I'm facing now is that the current thread on the hub is clockwise (CW), which means it's a CW hub. However, my left-hand drive freewheel requires a counterclockwise (CCW) thread. So I can not turn it to fit in the hub.
20240402_151227_leftsidThreadCW.jpg


So to be able to use it I have to either:
(a) Find a thread adapter to convert the CW thread to CCW. (However, I am unsure how to prevent it from loosening when the bicycle moves forward, causing the freewheel to move CCW ?) Something like this but I don't know if there is anything that suits this purpose, cannot find something for freewheel hub:
Screenshot 2024-09-09 at 8.23.30 AM.png



or (b), I have to find both side freewheel free\free hub type. But so far I cannot find anything like that so far. I found something like this but not sure if it is the right one and how to fit it into my bicycle:
Screenshot 2024-09-08 at 6.28.07 PM.png


or
Screenshot 2024-09-08 at 6.07.02 PM.png


My third option would be to replace the entire wheel with the freewheels on both sides. However, I prefer a flat-free tire and aim to minimize expenses by reusing components.

The fourth option I could think of is to consider relocating the motor to a different position so that the chain does not need to connect to the rear wheel, but instead could connect to other parts of the bike.

Please advise me on the best solution for my situation that is both cost-effective and convenient. Thank you very much!
 
Welcome, and thanks for being so detailed in your post. Although you have a good idea, maybe a mid drive Ebike conversion would be the best option for you. Aluminum frames are difficult to modify like this, especially since you can't really widen the dropouts without risking frame damage.
 
Maybe you could use one of these if you can get them in your country...
 
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Do you mean that this freewheel alone, with 3 separate cogs for 3 speeds, can replace the need for 2 freewheels? Will each cog work separately like a separate freewheel? I think that when one cog moves forward, it will make the whole freewheel move and in turn move another chain. So, if I pedal, I will have to move the motor's chain as well, which is very heavy. Similarly, when the motor moves its chain, it will also move the pedal chain and my legs.
On the other hand, if I use this freewheel with the freewheel adapter, I won't have enough space for another freewheel as mentioned in my original post. Also, I'm not very sure if this type of freewheel can fit onto my hub. Can you tell from the photos above if the hub has the right thread to support it?
 
Do you mean that this freewheel alone, with 3 separate cogs for 3 speeds, can replace the need for 2 freewheels? Will each cog work separately like a separate freewheel? I think that when one cog moves forward, it will make the whole freewheel move and in turn move another chain. So, if I pedal, I will have to move the motor's chain as well, which is very heavy. Similarly, when the motor moves its chain, it will also move the pedal chain and my legs.
On the other hand, if I use this freewheel with the freewheel adapter, I won't have enough space for another freewheel as mentioned in my original post. Also, I'm not very sure if this type of freewheel can fit onto my hub. Can you tell from the photos above if the hub has the right thread to support it?
Sorry, I slightly misunderstood. I don't think the 3 cog will work in your situation.
 
Changing to a mid-drive setup would be my fourth option, as it may require finding a new location to accommodate the motor ( I may need to weld a new system to support it.) and a new chain system. Here is the motor kit that I purchased:
View: https://www.youtube.com/watch?v=3LZ3enV1K08&t=16s
With my existing items, how do you suggest I should arrange it?

Hmmm. I'll have to think on this one. It's a great setup, but I'm unsure how to get it to work on this setup without spending alot
 
I believe a speed of 25 kmph or 16 mph should be adequate. I mainly require assistance on the slope, so strong torque is more important to me than speed.
 
The solution is simple; quit trying to put something in where you have no room. Instead install a shift kit. Then you could probably run a 7 speed 34-13 freewheel in the rear once you installed a rear derailleur and hanger. If you can't install a rear derailleur, I can show you how to use a 3 speed IGH as a jackshaft transmission.

Pictures of your whole bike would help also

Here's my bike.

20240813_151254.jpg

20240813_151210.jpg
20240813_131118.jpg
20240813_131101.jpg
20240813_151456.jpg
 
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