Front-wheel kit
The motor is in the front wheel.
Package format
Motor wheel, controller, display or control unit, sensors, and wiring; contents vary.
Key distinction
Fork suitability, axle and dropout dimensions, wheel and brake fit.
Conversion kits / A closer look
One kit.
Many working parts.
Understand the pieces before choosing the package. Explore the main kit types, the role of each component, and the details to compare.
Educational overview · OakSpark products coming soonChoose the architecture first
Four packages you may encounter.
Rear-wheel kit
The motor is in the rear wheel.
Package format
Motor wheel and controls, with gearing and mounting accessories depending on the package.
Key distinction
Rear spacing, cassette/freewheel, brake clearance, and torque-arm mounting.
Mid-drive kit
The motor mounts around the bottom bracket and drives the chain.
Package format
Motor, often with integrated controller; crank arms, chainring, speed sensor, harness, and controls may be included.
Key distinction
Bottom-bracket dimensions, frame clearance, chainline, and drivetrain suitability.
Controller + display bundle
Replacement electronics for an existing compatible system.
Package format
A controller and its matched display; sometimes additional controls.
Key distinction
Does not supply the motor wheel or battery unless explicitly stated.
Package examples: E-Bike Solution kit collection, mid-drive listing, and electronics bundle. These illustrate package types, not OakSpark products or a recommendation of their power ratings.
Component by component
What is inside a hub-motor kit?
A shopping checklist, not a promised packing list. Confirm every inclusion for the exact model and selected option.
Motor & wheel
Provides electric drive. A hub kit may arrive laced into a rim; a bare motor does not.
Check wheel assembly and axle fit.
Motor controller
Regulates electrical power to the motor using signals from the rider controls.
Check voltage, current limits, and protocol.
Display & control pad
Shows supported ride information and lets the rider select settings.
Check exact controller compatibility.
Pedal-assist sensor (PAS)
Detects pedaling for a supported assistance system.
Check sensor type and crank-side mounting.
Throttle
A thumb or twist control requests motor drive on systems that support it.
Check signal and operating-mode support.
Brake-cutoff controls
Levers or separate sensors signal the motor controller when braking.
Check the bicycle’s brake system.
Wiring harness
Carries power or control signals between supported parts.
Check connector pinouts and cable reach.
Torque arms
Restrain hub-motor axle rotation through a suitable mounting arrangement.
Check axle shape and frame or fork fit.
Mounts & axle hardware
Secure the motor and electronics using specified nuts, washers, and brackets.
Check the model’s installation drawing.
Controller bag or enclosure
Holds external electronics; not every kit supplies one.
Check size, attachment, and cooling.
Rear sprockets
A rear kit may include gearing, or require compatible gearing separately.
Confirm cassette versus threaded freewheel.
Instructions & tools
A model-specific manual should identify installation and setup requirements.
Confirm which tools are supplied.
Reference: example rear-wheel packing list. Functions explained using Grin Technologies’ conversion overview and torque-arm guidance.
Read the inclusions carefully
“Kit” does not always mean everything.
Battery & charger
A battery is needed to power the system, but may be excluded from the package. Charging equipment must match the exact battery. OakSpark has not confirmed a battery or charger offering.
Tire, tube & rim tape
A photograph of a wheel does not settle whether these consumables are supplied. Ask for an itemized list and confirm rim and tire dimensions.
Gearing & brake hardware
Confirm whether rear sprockets, brake rotor, and any required adapters are supplied or must be sourced separately.
Labor & specialist tools
Fitting, inspection, and setup are separate considerations. Mid-drive packages may require crank and bottom-bracket tools.
Compare like for like
The specification sheet to look for.
| Specification | What to ask |
|---|---|
| Motor rating | Nominal and peak output stated separately; intended operating conditions. |
| System voltage | Exact supported battery voltage range and controller limits. |
| Controller current | Rated and maximum current, including whether the value is battery or phase current. |
| Wheel dimensions | Rim diameter, width, and supported tire size; not just a marketing wheel label. |
| Mechanical fit | Axle drawing, dropout spacing, brake interface, and gearing type. |
| Mid-drive fit | Bottom-bracket shell width and diameter, clearances, and chainring offset. |
| Display & wiring | Exact model, protocol, firmware requirements, connector drawings, and cable lengths. |
| Contents & support | Itemized packing list, installation manual, replacement parts, and warranty terms. |
None of these values are confirmed OakSpark specifications. We will publish model-specific information after supplier confirmation.
Common kit questions.
Can I mix any display with any controller?
No. As one specific example, E-Bike Solution identifies its listed SW900/YF bundle as protocol No. 2 and excludes KT controllers. Even a familiar display name is not enough: confirm the exact version and controller pairing. See that bundle’s compatibility notes.
Does a kit’s wattage tell me its range?
No. Ask for the battery capacity and the conditions used for any range estimate, including rider load, terrain, speed, and assistance level.
Can I order one of these kit types from OakSpark?
Not yet. This guide explains the options while supplier discussions continue. No model, price, packing list, or delivery date is confirmed.
Have a particular build in mind?
Share your bicycle model, wheel size, and the type of kit you are considering.
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