Disc Hub Adapter

Bogaurd

Member
Joined
May 15, 2008
Messages
44
Hi,
I thought I might share this with other Happy Time users.

If you have a disc hub on the rear wheel of your bike, you can fashion an adapter plate to allow you to bolt your drive sprocket up to the disc hub - which gives you a very stroke mount point, perfectly centered sprocket & distributes the force to both sides of the wheel evenly.

The adapter plate sits something like this:

The green in the picture is the drive sprocket, the pink is the adapter plate. The white represents some sort of spacer.

My adapter plate was made out of 3mm steel, it turned out like this:

The hole in the centre of the rear drive sprocket was bored out to 53mm to allow clearance over the disc hub. The adapter plate is just a 120mm disc with a 33mm hole bored in the centre, and the appropriate hole patterns for your disc hub & sprocket drilled in it.
 

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T

turkeyssr

Guest
This is also relevant for Titan users. I would certainly have consider this option versus the custom sproket assuming the price point is lower for this version. I think this version would also have helped me in left side clearance issues.

How did you make this? What was the cost?

Thanks! - John
 
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Bogaurd

Member
Joined
May 15, 2008
Messages
44
Hi John,
I drew up some designs for this, and had it made at an engineering firm nearby.

The cost was 30 Australian dollars including the drilling of all holes & enlarging of the center hole in the drive sprocket.

Terry.
 

ocscully

Member
Joined
Jun 23, 2007
Messages
661
Bogaurd

could you ship that ? to the usa ?
MasterLink,

You can pick up essenitally the same thing at Your Local Bike Shop or any dealer that sells Bicycle disc Brake Rotors. Member AzBill used a 6in disc brake rotor and mounted the sprocket to it. You can add spacers to get what ever chain line you need. See his photos over in the Photo gallery the Thread is called My Jag

ocscully
 

Bogaurd

Member
Joined
May 15, 2008
Messages
44
MasterLink,

You can pick up essenitally the same thing at Your Local Bike Shop or any dealer that sells Bicycle disc Brake Rotors. Member AzBill used a 6in disc brake rotor and mounted the sprocket to it. You can add spacers to get what ever chain line you need. See his photos over in the Photo gallery the Thread is called My Jag

ocscully
Indeed! :)

The only reason I didn't go this way is that the frame I have was not designed for use with disc brakes, and there is insufficient clearance for a disc rotor in the rear stays (I tried!)

Either way, you'll probably need to increase the size of the center hole of your sprocket - mine came with a ~30mm hole, I had it bored out to around 55mm to clear the disc hub.
 

loquin

Active Member
Joined
Jan 11, 2008
Messages
2,214
BTW. Located this hole pattern for disk brake mounts.

The standard today is the 44 mm center-to-center spacing with M5 tapped holes.

Occasionally, you may also come across one with a 48 mm center-to-center spacing, with 4 mm countersunk holes.
 

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