To convert drum brakes to disc brakes, choose a kit made for your vehicle or bicycle’s exact axle, hub, and mounting setup. The Speedway Motors kit is aimed at specific GM rear ends, while the Feralmoto kit serves listed mini bikes. The other options are bicycle adapters, not automotive conversion kits. Compare their applications before buying: parts designed for a car, mini bike, or bicycle are not interchangeable.
| Product | Best For | Key Fitment Detail |
|---|---|---|
| Speedway Motors Rear Disc Brake Conversion Kit | Some GM mid-size cars | GM 10- and 12-bolt rear ends |
| Feralmoto Mini Bike Conversion Kit | Listed mini bikes | Weld-on adapter plate and bolt-on parts |
| Juscycling Threaded Hub Adapter | Threaded bicycle hubs | Freewheel threads to six-bolt rotor mount |
| DoThisAllDay Brake Bracket Adapters | Some bicycle conversions | Two listed bracket sizes |
| 22mm Disc Brake Adapter Bracket | Some BMX and MTB builds | Approximately 22mm inner diameter |
Speedway Motors GM Rear Disc Brake Kit
This bolt-on kit is best for owners of compatible GM mid-size cars who want to replace rear drum brakes with discs. The listed application is GM 10- and 12-bolt rear ends; the product description says it is not suitable for full-size cars, pickups, or 7.5-inch 10-bolt axles.
The kit includes two caliper brackets, two vented rotors, two GM metric calipers, and installation hardware. It was selected because it is a vehicle-specific rear conversion package rather than a general-purpose brake adapter.
Check before buying: Confirm the car’s axle and application match the stated fitment. Avoid this kit if your vehicle has one of the excluded axle or vehicle types.
Feralmoto Mini Bike Disc Brake Kit
This kit is best for owners converting a listed mini bike from drum brakes to a disc setup. Named models include Coleman CT200U, BT200X, CT200U-EX, Axis M200, and several Baja and Massimo MB200 models.
The product uses a 63mm caliper and 160mm rotor, with a weld-on adapter plate and bolt-on components. It was selected for buyers seeking a mini-bike-specific conversion rather than a bicycle or car kit.
Installation limitation: The described setup requires welding the adapter plate, so it is not a fully bolt-on installation. Verify the model and mounting arrangement before starting work.
Juscycling Threaded Hub Disc Adapter
This two-pack is best for a bicycle or similar build with a hub threaded for a freewheel, sprocket, or drum brake. It adds a standard six-bolt rotor mounting flange, allowing a compatible rotor and caliper to be used without replacing the hub, according to the product description.
The adapter has a 44mm bolt circle and is listed for standard six-bolt rotors in 140mm, 160mm, 180mm, or 203mm sizes. Its stated thread is 1.37 inches by 24 TPI. It was selected for its clearly specified threaded-hub application.
Check before buying: Your hub must have matching threads, and the adapter alone does not include a rotor or caliper. This is not an automotive brake conversion part.
DoThisAllDay Bicycle Brake Bracket Adapters
These two steel brackets are best for bicycle builders whose frame or fork mounting arrangement matches the listed 160/22mm and 160/31.8mm sizes. The product description presents them as a way to adapt a normal bicycle for disc brakes and notes that they can be installed and removed.
They were selected as a bicycle conversion option, not a complete brake kit. The listing does not specify included rotors, calipers, or detailed frame compatibility.
Check before buying: Compare the bracket dimensions with your bicycle’s mounting points. Do not assume the adapters will fit every bicycle or replace the need for compatible brake components.
22mm Adjustable Bicycle Disc Brake Adapter
This adapter is best for BMX or mountain-bike modification projects that need a bracket with an approximately 22mm inner diameter. The product description identifies an adjustable bracket intended to accommodate modification needs on bicycles of different sizes.
It was selected for shoppers considering a bicycle disc-brake conversion where an adapter mount may be appropriate. The described construction is metal, but the listing does not provide a complete brake system or detailed fitment measurements beyond the inner diameter.
Check before buying: Confirm the frame, mounting location, and brake components match the adapter. It is not a direct substitute for a car or mini-bike conversion kit.
Buying Guide: How To Choose A Drum-To-Disc Conversion
Is the conversion for a car, mini bike, or bicycle?
Start with the vehicle type. Automotive rear-end kits, mini-bike kits, and bicycle adapters use different mounting systems and components. A bicycle hub adapter cannot convert a car axle, and a car kit is not suitable for a bicycle.
What measurements and fitment details should you check?
For a car, verify the axle type and vehicle application, including any exclusions. For a mini bike, confirm the exact model and whether welding is required. For a bicycle, check hub threads, bracket dimensions, rotor bolt pattern, and available mounting points.
Is the product a complete conversion kit?
Some products include rotors, calipers, brackets, and hardware; others only provide an adapter or mounting bracket. Read the included-parts description and identify any additional components needed before choosing.
Does installation require fabrication?
A bolt-on design may simplify installation, but fitment still needs to be confirmed. The Feralmoto listing specifically describes a weld-on adapter plate. If welding or fabrication is outside your abilities, account for that requirement before purchase.
What should you do before driving or riding?
Use components that match the application and follow appropriate installation procedures. Because brake work affects vehicle control, have the completed installation inspected by a qualified mechanic or bicycle technician when needed.
Frequently Asked Questions
Can I use a bicycle disc brake adapter on a car?
No. The listed bicycle adapters are designed for bicycle hubs or frames, not automotive axles and braking systems.
Does every drum-to-disc kit fit every vehicle with drum brakes?
No. Fitment depends on the axle, hub, frame, or vehicle model. For example, the Speedway Motors kit specifies particular GM rear ends and excludes some applications.
Does the threaded hub adapter include a rotor and caliper?
The listed features describe the adapter as a mount for adding a rotor and caliper; they do not identify those parts as included.
Do mini-bike conversions always install without welding?
No. The Feralmoto kit describes a weld-on adapter plate along with bolt-on components, so its installation includes a welding step.
What information should I confirm before ordering?
Check the exact model or axle, hub threads or mounting dimensions, rotor size, included components, and whether installation requires welding or other fabrication.