Left side freewheeling cog with rotor

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ferret   1 kW

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Left side freewheeling cog with rotor

Post by ferret » May 16 2019 1:43am

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Tommm   10 kW

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Re: Left side freewheeling cog with rotor

Post by Tommm » May 16 2019 6:01am

ferret wrote:
May 16 2019 1:43am
Latest build:

https://www.youtube.com/watch?v=8m2mGqZIyx4

Avner.
Sick. How wide is the hub?

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ferret   1 kW

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Re: Left side freewheeling cog with rotor

Post by ferret » May 16 2019 7:39am

Thanks.

It's 150mm.

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Grantmac   10 kW

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Re: Left side freewheeling cog with rotor

Post by Grantmac » May 16 2019 11:01am

Details?

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ferret   1 kW

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Re: Left side freewheeling cog with rotor

Post by ferret » May 16 2019 11:25am

I converted a 135mm hub to a 150mm hub.
A little bonus is that this setup places the rim exactly between the hub flanges, which makes a stronger symmetric wheel.

On the left side, a 56t narrow wide chainring is mounted on a freewheel behind a 203mm brake rotor.

The planned build is a mid drive setup with a chain running to the rear wheel on the left side, while retaining the disk brake.

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Grantmac   10 kW

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Re: Left side freewheeling cog with rotor

Post by Grantmac » May 16 2019 11:47am

Specifics of the adapter used would be greatly appreciated. I have a similar idea in mind for a 150mm drop out bike, but not reinventing the wheel is much easier.

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ferret   1 kW

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Re: Left side freewheeling cog with rotor

Post by ferret » May 16 2019 11:57am

It required designing and machining two adapters as well as machining to the hub.
Not many off the shelf parts, unfortunately.
IMG_20190516_212631_800.jpg
IMG_20190516_212631_800.jpg (188.17 KiB) Viewed 1220 times
IMG_20190516_212722_800.jpg
IMG_20190516_213513_800.jpg
IMG_20190516_213513_800.jpg (209.51 KiB) Viewed 1220 times
Avner.
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Grantmac   10 kW

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Re: Left side freewheeling cog with rotor

Post by Grantmac » May 16 2019 2:16pm

How much machining on the hub itself? Can you share a picture of the adapter?

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Re: Left side freewheeling cog with rotor

Post by ScooterMan101 » May 16 2019 8:00pm

Excellent !

So you are using a 148150 mm wide rear dropout Plus wheel size bike ?

What size narrow wide chain are you using 8 speed ? 9 speed 10 ? 11 ? 12 speed sram eagle ?

For those who did not notice he is using a throu-axle hub/wheel ,
so not possible with a 135x 10mm old style axle ?

ferret wrote:
May 16 2019 11:25am
I converted a 135mm hub to a 150mm hub.
A little bonus is that this setup places the rim exactly between the hub flanges, which makes a stronger symmetric wheel.

On the left side, a 56t narrow wide chainring is mounted on a freewheel behind a 203mm brake rotor.

The planned build is a mid drive setup with a chain running to the rear wheel on the left side, while retaining the disk brake.

Avner.
My first conversion ... Sold

viewtopic.php?f=3&t=71378&p=1077497&hil ... 1#p1077497

It's 2018 already, ( now 2019 ) lets get some real , improved e-bike / e-velomobile / e-motorcycle designs .

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ferret   1 kW

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Re: Left side freewheeling cog with rotor

Post by ferret » May 17 2019 1:23am

The bike is a downhill bike with 150mm dropouts. 148mm is not enough. I also suspect that a plus size tire wouldn't clear the chain.

NW chainrings aren't very sensitive to chain type. I ordered a generic Chinese one and use it with a 10 speed chain.

It depends on the specific hub used, but it should be possible for 9mm or 10mm axles.

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DanGT86   10 kW

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Re: Left side freewheeling cog with rotor

Post by DanGT86 » May 17 2019 9:13am

Is there a standard thread-on bike Freewheel in there? If so, is the innermost circle of 8 bolts smaller than the minor diameter of the Freewheel threads so they can pass through to the hub? Its hard to see what is going on there? Are you keeping it secret? :wink:

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ferret   1 kW

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Re: Left side freewheeling cog with rotor

Post by ferret » May 17 2019 10:18am

Grantmac wrote:
May 16 2019 2:16pm
How much machining on the hub itself? Can you share a picture of the adapter?
I had to remove the boss that centers the rotor on the hub as well as modifying the end cap. I also replaced the hubs's axle to from a 150mm hub.
DanGT86 wrote:
May 17 2019 9:13am
Is there a standard thread-on bike Freewheel in there? If so, is the innermost circle of 8 bolts smaller than the minor diameter of the Freewheel threads so they can pass through to the hub? Its hard to see what is going on there? Are you keeping it secret? :wink:
Yes and yes.

Here some pictures to make it clearer:
2019-05-17 at 18.06.16.jpeg
2019-05-17 at 18.14.28.jpeg
2019-05-17 at 18.14.28.jpeg (57.31 KiB) Viewed 1144 times

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larsb   1 MW

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Re: Left side freewheeling cog with rotor

Post by larsb » May 17 2019 11:44am

Been seeing solutions like this a while, just want to point out that the disc will get chain lube on it. The pads will not be what they were.. A 3D printed chain guard would help
Ride on!

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ferret   1 kW

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Re: Left side freewheeling cog with rotor

Post by ferret » May 17 2019 12:02pm

I run a similar setup in my Astral Rune build and had no brake contamination.
I'm using wax based chain lubes so the only risk is during application.

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larsb   1 MW

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Re: Left side freewheeling cog with rotor

Post by larsb » May 17 2019 2:05pm

Been running a similar setup with dry lubes. I still can see traces of contamination close to the sprocket even though they're dry.

I never clean my bike, could be one reason :D
Ride on!

aCeMadMod   1 kW

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Re: Left side freewheeling cog with rotor

Post by aCeMadMod » May 23 2019 5:59am

Hi are you planing to sell them if so how much?

Are they alloy or stianless?


Hope to get a reply all the best😎

Tommm   10 kW

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Re: Left side freewheeling cog with rotor

Post by Tommm » May 23 2019 9:33am

You could find a hub or hub + longer axle combo which you could make an adaptor for, it would be replicable as a product.

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ferret   1 kW

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Re: Left side freewheeling cog with rotor

Post by ferret » May 23 2019 1:05pm

I don't think there's a business case for selling it, much less making it a product. Not many diy people are interested in converting 150mm frames or retaining the disc brakes.

Making an adapter cost around $250 (I had 2 versions made, one alloy and one steel).
Add the price of the hub, long axle, freewheel, bearings, spacers, fastners and machining and you'd probably be approaching $400 out of pocket expenses.
I'm sure the costs could be lowered by sourcing large quantities, but I don't think there are enough customers to get there.

Avner.
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cheapcookie   100 W

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Re: Left side freewheeling cog with rotor

Post by cheapcookie » Jun 01 2019 10:40am

Hey ferret, could you find the ditch your rear brake thread, and leave your opinion, especially tell us how pedaling is better with freewheel.

Thanks, Cookie.

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