|
|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
drum brakes on non-drum designed hubs
Can I take a drum brake and mount the rotor on a non drum hub to some plates inside the flanges and spokes and secure plates through the spokes and flanges via bolts? Seems it might put some stresses on spokes in directions they were not designed to handle so might bend. Anyone tried this and had success or failure? Anyone think it would work/fail? If so why/why not? -- meb |
Ads |
#2
|
|||
|
|||
drum brakes on non-drum designed hubs
meb wrote in
: Can I take a drum brake and mount the rotor on a non drum hub to some plates inside the flanges and spokes and secure plates through the spokes and flanges via bolts? Seems it might put some stresses on spokes in directions they were not designed to handle so might bend. Anyone tried this and had success or failure? Anyone think it would work/fail? If so why/why not? Well, drum brakes work by pushing pads against the inside of the hub shell, so no, that wouldn't work. But you're description is that of disc brakes. And no, if you tried to attach the rotor straight to the spokes, you would be forcing the wheel out of dish, if not out of true, with every application of the brakes. And to anticipate the unasked half of this question, no, it's generally not a good idea to mount disc brakes on a frame or fork not designed for them. |
#3
|
|||
|
|||
drum brakes on non-drum designed hubs
Hank Wirtz Wrote: meb wrote in : Can I take a drum brake and mount the rotor on a non drum hub to some plates inside the flanges and spokes and secure plates through the spokes and flanges via bolts? Seems it might put some stresses on spokes in directions they were not designed to handle so might bend. Anyone tried this and had success or failure? Anyone think it would work/fail? If so why/why not? Well, drum brakes work by pushing pads against the inside of the hub shell, so no, that wouldn't work. But you're description is that of disc brakes. And no, if you tried to attach the rotor straight to the spokes, you would be forcing the wheel out of dish, if not out of true, with every application of the brakes. And to anticipate the unasked half of this question, no, it's generally not a good idea to mount disc brakes on a frame or fork not designed for them. I meant drum-I mispoke when I called it a rotor. Your answer on the spokes was fortunately directed at the issue I was concerned about. Thanks -- meb |
#4
|
|||
|
|||
drum brakes on non-drum designed hubs
meb wrote: Hank Wirtz Wrote: meb wrote in : Can I take a drum brake and mount the rotor on a non drum hub to some plates inside the flanges and spokes and secure plates through the spokes and flanges via bolts? Seems it might put some stresses on spokes in directions they were not designed to handle so might bend. Anyone tried this and had success or failure? Anyone think it would work/fail? If so why/why not? Well, drum brakes work by pushing pads against the inside of the hub shell, so no, that wouldn't work. But you're description is that of disc brakes. And no, if you tried to attach the rotor straight to the spokes, you would be forcing the wheel out of dish, if not out of true, with every application of the brakes. And to anticipate the unasked half of this question, no, it's generally not a good idea to mount disc brakes on a frame or fork not designed for them. I meant drum-I mispoke when I called it a rotor. Your answer on the spokes was fortunately directed at the issue I was concerned about. Thanks -- meb One thing perhaps worth pointing out - one of the eletric-assist retrofit kits out there has a rear rack mounted motor that rotates a big plastic disc attached somehow on the left side of the rear wheel, and the force is transmitted by the big plastic disc pressing on a handful of spokes, like 3 or 4. I think the contact point is around mid-span but I'm not sure - I only saw one of these in person once and it was a while ago. The design struck me as really sketchy and ill-conceived, but perhaps I'm missing something and the spokes don't particularly mind this treatment. It was a bit like what I think you're describing, with the spokes being pushed on oddly to deliver a torsional load to the hub. |
#5
|
|||
|
|||
drum brakes on non-drum designed hubs
Don't forget the mopeds of the 30's and 40's:
http://www.geocities.com/motorcity/garage/2136/ I would assume that one of those would be placing a much higher load on the spokes than an electric retrofit. |
#6
|
|||
|
|||
drum brakes on non-drum designed hubs
meb wrote: Can I take a drum brake and mount the rotor on a non drum hub to some plates inside the flanges and spokes and secure plates through the I meant drum-I mispoke when I called it a rotor. Your answer on the spokes was fortunately directed at the issue I was concerned about. There are very few drum brakes which are separate from the hub. I'm only aware of one, the Arai: http://harriscyclery.net/page.cfm?Pa...ils&sku=BR5001 This attaches to a rear hub which has threads on the left side. My feeling is that you *could* mount it as you suggest, but it would be extremely difficult to get the clearance between the pads and the drums adjusted properly. This has to be very small so that there's very little slack in the cable- otherwise, you run out of lever travel before you get all your braking power. You could attach one of these to a rear freewheel (threaded) hub and use it on the front, but there's a bunch of additional considerations. I've seen it done, and it ain't straightforward. Jeff |
#7
|
|||
|
|||
drum brakes on non-drum designed hubs
JeffWills wrote: meb wrote: Can I take a drum brake and mount the rotor on a non drum hub to some plates inside the flanges and spokes and secure plates through the I meant drum-I mispoke when I called it a rotor. Your answer on the spokes was fortunately directed at the issue I was concerned about. There are very few drum brakes which are separate from the hub. I'm only aware of one, the Arai: http://harriscyclery.net/page.cfm?Pa...ils&sku=BR5001 This attaches to a rear hub which has threads on the left side. My feeling is that you *could* mount it as you suggest, but it would be extremely difficult to get the clearance between the pads and the drums adjusted properly. This has to be very small so that there's very little slack in the cable- otherwise, you run out of lever travel before you get all your braking power. You could attach one of these to a rear freewheel (threaded) hub and use it on the front, but there's a bunch of additional considerations. I've seen it done, and it ain't straightforward. Jeff Any information about how well this worked once it was set up? (I assume they had it set up with a normal brake lever as opposed to using it as a drag brake?) |
#8
|
|||
|
|||
drum brakes on non-drum designed hubs
-snip-
JeffWills wrote: There are very few drum brakes which are separate from the hub. I'm only aware of one, the Arai: http://harriscyclery.net/page.cfm?Pa...ils&sku=BR5001 This attaches to a rear hub which has threads on the left side. My feeling is that you *could* mount it as you suggest, but it would be extremely difficult to get the clearance between the pads and the drums adjus ted properly. This has to be very small so that there's very little slack in the cable- otherwise, you run out of lever travel before you get all your braking power. You could attach one of these to a rear freewheel (threaded) hub and use it on the front, but there's a bunch of additional considerations. I've seen it done, and it ain't straightforward. Nate Knutson wrote: Any information about how well this worked once it was set up? (I assume they had it set up with a normal brake lever as opposed to using it as a drag brake?) They are or were the standard tandem drag brake for years. SImple effective cheap . Yes compatible with standard ( not 'linear' ) levers. You would have to widen the fork and get a longer axle to make this go - very one-off. -- Andrew Muzi www.yellowjersey.org Open every day since 1 April, 1971 |
#9
|
|||
|
|||
drum brakes on non-drum designed hubs
"A Muzi" wrote in message ... You could attach one of these to a rear freewheel (threaded) hub and use it on the front, but there's a bunch of additional considerations. I've seen it done, and it ain't straightforward. Nate Knutson wrote: Any information about how well this worked once it was set up? (I assume they had it set up with a normal brake lever as opposed to using it as a drag brake?) They are or were the standard tandem drag brake for years. SImple effective cheap . Yes compatible with standard ( not 'linear' ) levers. You would have to widen the fork and get a longer axle to make this go - very one-off. Maybe not. Some decades ago I mouted a disc brake on a freewheel hub, and put it on the front; didn't need to widen the forks, but I had to pick and choose the cones to make it fit. |
#10
|
|||
|
|||
drum brakes on non-drum designed hubs
Nate Knutson wrote: JeffWills wrote: You could attach one of these to a rear freewheel (threaded) hub and use it on the front, but there's a bunch of additional considerations. I've seen it done, and it ain't straightforward. Jeff Any information about how well this worked once it was set up? (I assume they had it set up with a normal brake lever as opposed to using it as a drag brake?) They were used on a couple of Seattle-based homebuilt recumbents. Seattle's pretty hilly, and both riders are still alive, so I *assume* they worked good enough for road use. Jeff |
|
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Are more expensive brakes noticeably better? | Mark Thompson | UK | 1 | January 18th 06 10:59 AM |
Pedersen self energizing brakes. | Dan Burkhart | Techniques | 70 | June 12th 05 10:25 PM |
Rec.Bicycles Frequently Asked Questions Posting Part 1/5 | Mike Iglesias | General | 4 | October 29th 04 07:11 AM |
Bedford Downhill Mountain Unicycle Brakes | Darren | Unicycling | 27 | January 20th 04 03:21 AM |
Mechanical disc brakes and hub | Piotrek S. | Mountain Biking | 17 | September 22nd 03 11:23 AM |