Build · DIY
Build Your Own — Radium Parts for DIY E-Skate
Radium makes the components serious builders want — the same parts that go into our own boards, available for yours. Here's the catalogue, sorted the way a build comes together.
Motors
Radium's 6455 and 6485 outrunners were developed in-house — hundreds of hours of simulation and testing behind them. The grunt at the heart of a serious build.
Wheels
Urethane and high-performance wheels in the sizes and durometers that actually change how a board rides.
Pulleys & belts
The gearing of a belt-drive build. Match pulley tooth counts to trade torque for top speed — and keep spares on hand, because belts are wear parts.
Motor mounts & hardware
Mounts, fasteners and the small parts that hold belt alignment and keep a build tight. Get these right and you forget they're there.
Trucks & adapters
Radium trucks plus the adapters, heatsinks and bushings that let you tune the platform to your setup.
Compatibility & Fitment
Radium parts are built to e-skate DIY standards, so they play nicely with the wider ecosystem. Here's the detail — with how confident we are in each figure.
Verified = from Radium's own specs. Standard = an industry standard Radium follows. Anything brand-specific, confirm before ordering.
Gearing & beltsVerified
| Gear setup | Compatible belts (HTD 5M, 15mm) |
|---|---|
| 45 / 16T (Fast) | HTD5M-375-15, 380-15, 385-15 |
| 45 / 18T (Faster) | HTD5M-380-15, 385-15 |
Standard wheel setupVerified
| Component | Spec |
|---|---|
| Wheels | Radium SR125 |
| Pulley | Radium Core 45T |
| Motor bearing | 28 × 10 mm |
| Bearing spacers | 22.4 mm |
Kegel-core setup (e.g. Mad 105)Verified
| Component | Spec |
|---|---|
| Pulley | Radium Core 45T + Kegel adapter |
| Motor bearing | 28 × 10 mm |
| Wheel bearings | 22 × 10 mm |
| Bearing spacers | 10 mm (for 10 mm axles) |
Wheel size rangeVerified
| Supported | Detail |
|---|---|
| 80 – 165 mm | Depending on hardware & pulley setup |
| Street thane | Radium SR125 and equivalents |
| Kegel core | Mad 105 and other Kegel-core wheels |
| All-terrain | Mountainboard hardware available |
Standards Radium follows Standard
Radium drives run the HTD 5M profile (5 mm pitch, 15 mm wide) — the DIY-standard belt used right across the e-skate world — on 10 mm motor shafts, and our wheels use a standard Kegel core. We build to the standards on purpose: a part that fits the standard, fits.
“Will your wheels fit my board?” The honest, broad answer: if your trucks and axles take a standard Kegel-core wheel, yes — and that covers most of the e-skate world. We can't physically test every board on the market and we won't pretend to, so if you're running something unusual, send us your setup and we'll tell you straight before you buy.
Standards verified against the e-skate DIY ecosystem (Boardnamics, MBoards, Omni Esk8). Radium specs from the Mach One manual.