Well pretty much I’d like to put on disc brakes on a spoke wheel. But the wheel is a coaster brake wheel. How can I make that happen. And I’d like to do it the correct way.
I wanted to do what you want to do but never did find a cost effective or safe way to do so.
Here is what i did instead...you will still have to buy cables, and a dual pull brake lever for the right side if your using a clutch lever on the left side of the handlebars and unless you can make the frame to caliper adaptors yourself, you will have to add that to the list as well.
Im also posting my pics below of the finished build that was done in January...DAMIEN
Are you looking for a heavy-duty wheel set built for speed? Sick of having to make constant adjustments and to your spoked rim? Then the BBR Tuning 26 Inch Heavy Duty 3 Spoke Motorized Bike Mag Wheel Set is exactly what you’ve been looking for! Built to be disc-brake ready and pre-installed with...
www.bikeberry.com
This link below will probably work OK for the rear brake caliper adaptor. On mine, I made my own with some help, from 7075 T6 Military grade aircraft aluminum.
This works with motorized or standard bicycles and allows you to install a disk brake if you don't have the necessary mounts. No more rim or coaster brakes.
www.bikeberry.com
For the front caliper adaptor, you may have to ask someone else here since i used a Military jet "Adel" clamp for mine
Here is the dual pull brake lever.
The Sunlite Alloy Dual Brake Lever - operate your front and rear brakes with just one pull. Revolutionize your riding! Shop our selection today.
www.bikeberry.com
You will also need the 22 tooth, freewheel sprocket for the pedal side of things, You will need a new pedal side chain as well since i doubt the old one will fit the 22 tooth sprocket...i bought the chain at my local bike shop...you will need at minumum a 114 link chain if im not mistaken.
The Sunlite Single Speed 22 Tooth Sprocket is what you need to eliminate any mods you need to make to a wheel, giving you a more secure rear wheel sprocket assembly.
www.bikeberry.com
And i got the cables i needed from my local bike shop.
The cost for these 2 mags wheels, plus 2 disk brake calipers and 2 rotors plus 36 tooth rear sprocket is 108.00 US dollars, Thats as cheap as it gets...they are out of stock at the moment but will be back as always.