Jackshaft disc-brake mod....when there is no other way....
- Thread starter scotto-
- Start date
scotto-
Custom 4-Stroke Bike Builder
Next you fabricate a rotor of appropriate size and adapt it to the jackshaft.
Now comes the fun part, making a bracket for the caliper. The easiest way to go about this is place the caliper in an appropriate position on the rotor and tighten the pads to hold it on the rotor. Then you make a template of the bracket to be with some stiff cardboard and a pen. The bracket will support the caliper with two bolts and must be attached to the bike frame or in this case, the jackshaft bracket.
URL=http://imageshack.us/photo/my-images/268/img0804z.jpg/]
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more to come...
Now comes the fun part, making a bracket for the caliper. The easiest way to go about this is place the caliper in an appropriate position on the rotor and tighten the pads to hold it on the rotor. Then you make a template of the bracket to be with some stiff cardboard and a pen. The bracket will support the caliper with two bolts and must be attached to the bike frame or in this case, the jackshaft bracket.
URL=http://imageshack.us/photo/my-images/268/img0804z.jpg/]
more to come...
chainmaker
Well-Known Member
Very cool Scotto !! I bet we are going to see more of this.
scotto-
Custom 4-Stroke Bike Builder
Thanks, I think you're right chainmaker as it's a simple yet effective set-up when your options are limited.
Here is the bracket in rough form made from 1/4" aluminum plate. I'll be mounting it tomorrow with 3/4" threaded round stainless stand-offs.
URL=http://imageshack.us/photo/my-images/151/img0812gp.jpg/]
scotto-
Custom 4-Stroke Bike Builder
It's really not much different than letting off the throttle on these bigger bore 4-strokes and letting the engine's compression do the braking.
DaveC
Member
OK, this is good. I have a Dynacraft West Coast LTD and I was wondering where to get the extra long brakearm brakes they come with but mine didn't 
I love this solution and I'll be getting the parts as soon as I sell 1 of the two bikes I'll have up for sale.
I'm looking around here for a machinest that will do work for free or real cheap, someone who likes to do projects more than make money. They are out there if you can find them and I'm a-lookin'
I got one of the gokart halfshaft setups. I'm pretty sure your pillow blocks can handle higher loads but I think the gokart one will work out well, too.
I love this solution and I'll be getting the parts as soon as I sell 1 of the two bikes I'll have up for sale.I'm looking around here for a machinest that will do work for free or real cheap, someone who likes to do projects more than make money. They are out there if you can find them and I'm a-lookin'
I got one of the gokart halfshaft setups. I'm pretty sure your pillow blocks can handle higher loads but I think the gokart one will work out well, too.
culvercityclassic
Well-Known Member
Nice work Scotto, I am putting the finishing touches on the one I am installing. Waiting for a 6 inch rotor from VMB.
diceman2004
New Member
Did you make that rotor out of a old chain ring ? good thinkin man .
Nice mod , awsome idea .
Nice mod , awsome idea .
scotto-
Custom 4-Stroke Bike Builder
The rotor was made from a 28t cog that was part of a older chrome plated Shimano Hyper-Glide cassette.......works like a champ.
I've seen similar set-ups on scooters and go-karts in the past....AGK has been running them on bikes for a while now. It's great for when you have very limited rear wheel space and you want more than a coaster brake for rear stopping power and controllable modulation.
diceman2004
New Member
Another route to go ( and they make these for motorcycles also ) is ,if your rear sprocket is big enough ( for the clearance ) , to use the rear wheels sprocket itself as the brake rotor ,
Just mount the caliper in the open area in front of the sprocket .
The thing i like about the sprocket-rotor setup is .. it looks cool .. its a clean setup .. less parts ( no need to add a rotor because the sprocket is the rotor )
Just mount the caliper in the open area in front of the sprocket .
The thing i like about the sprocket-rotor setup is .. it looks cool .. its a clean setup .. less parts ( no need to add a rotor because the sprocket is the rotor )
scotto-
Custom 4-Stroke Bike Builder
The only prob with that set-up in my application is my rear sprocket is 4.1mm thick.....I don't know of any bicycle disc-brake caliper that would accept that thickness. A caliper from a motorcycle may work, but the expense and weight would be considerably more I'm sure. Would make for a clean set-up though, I've seen them before.
buck0
New Member
The rotor was made from a 28t cog that was part of a older chrome plated Shimano Hyper-Glide cassette.......works like a champ.
I've seen similar set-ups on scooters and go-karts in the past....AGK has been running them on bikes for a while now. It's great for when you have very limited rear wheel space and you want more than a coaster brake for rear stopping power and controllable modulation.
Looks great man and I wouldnt have guessed that the rotor was from a cassette.
Where did you get the locking collar that the rotor mounts onto?
Thx
scotto-
Custom 4-Stroke Bike Builder
The locking collar is the center part of the Congress V-pulley (pictured) that was in my never ending parts pile in my garage. They're cheap to buy new however, but I like using stuff I have lying around
simple, yet effective.....