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Old 09-05-09, 11:49 PM   #1
Allen
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Shimano Front Hub Roller Brake Question

Can one mount a Shimano Roller Brake on a normal fork or does it have to be a disk specific fork?
Is a normal fork too thin for a roller brake, is the Shimano Roller Brake specific to disk tabs?

Many thanks,

--Allen
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Old 09-06-09, 08:30 AM   #2
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Hello do you have any pic? I can't find any right now. it may have a axle that can only be inserted one way to allow the cable mechanism to align witht he fork blade. like how you need the specuial washers for the internal rear hubs. if I could see a pic I think I could tell for sure. it seems unlikely that a special fork would be required as manufacturers might shy arau from not being able to use a 'stock' fork on this one model
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Old 09-06-09, 12:11 PM   #3
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I haven't seen one in person.
I can't find anything about fork compatibility on the Shimano website, nor any images of it mounted on a frame.


http://bike.shimano.com/publish/cont...-F.-type-.html

They bolt onto Nexus hubs, I want to add one to a dyno hub for a commuter.


The brake before it's mounted to the hub.
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Old 09-06-09, 04:38 PM   #4
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The roller brake does not use disc brake mounts so far as I can tell from the Shimano documentation.

Historically drum type front brakes have used a torque arm which uses a P clamp. or similar type clamp band, to attach to the fork leg. From the Shimano document the rolller brake is designed to mount the torque arm to a special braze on attached to the fork leg it looks like. Whether a P clamp can be substituted seems to be unclear. Here is the Shimano installation sheet for a front roller brake.

http://techdocs.shimano.com/media/te...9830604289.pdf
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Old 09-06-09, 06:23 PM   #5
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Quote:
Originally Posted by AllenG View Post
I haven't seen one in person.
I can't find anything about fork compatibility on the Shimano website, nor any images of it mounted on a frame.


http://bike.shimano.com/publish/cont...-F.-type-.html

They bolt onto Nexus hubs, I want to add one to a dyno hub for a commuter.


The brake before it's mounted to the hub.
The model shown in your picture does mount to disc brake tabs, but they are also available with a torque arm. Sturmey Archer makes a band clamp in several sizes that mounts to the fork and the torque arm slides right in when installing the wheel.
I have sold and serviced both, and frankly, I prefer the torque arm type for ease of wheel installation.
I have some of those Sturmey Archer band clamps, but I'm on the road right now so I can't check the size.
A hose clamp will work too, but it's a little inelegant. I have one on the front wheel of my antique Scwinn tandem because a band clamp doesn't work too well on a solid bladed fork.
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Old 09-06-09, 11:23 PM   #6
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Thank you. I was looking at the Shimano because I already have one of their dyno hubs laced up.
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Old 09-07-09, 03:25 AM   #7
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Originally Posted by AllenG View Post
Thank you. I was looking at the Shimano because I already have one of their dyno hubs laced up.
I understand that. I was refering to Shimano roller brakes, but the SA band clamp will work with it.It provides a slot for the torque arm to slide right into.
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Old 09-07-09, 11:22 AM   #8
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Again, thank you very much Dan.
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Old 09-07-09, 02:52 PM   #9
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Again, thank you very much Dan.
Sorry I could not be more concise earlier, but I am on the road, and I did not have much time to clear things up for you.
The picture you attached shows a model BR -IM75. What you want is a BR -IM 70. Same brake,just different in the torque bracing.
You can see the difference in the attached tech documents linked to this page.
http://techdocs.shimano.com/techdocs...=1191070998277
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Old 09-08-09, 12:14 AM   #10
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Further, the BR-IM70 requires a braze on tab to support the torque arm and cable stop. The BR IM41 has a slot right on the torque arm for the cable stop to slide right in so that you can use the band clamp I mentioned earlier.
The 41 might be a lesser brake, but it still works pretty good. That's what I have on the front of my tandem, and it does a pretty good job of stopping a 65 lb bike with a 500 lb load.


Last edited by Dan Burkhart; 09-08-09 at 12:22 AM.
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