Spoked flywheels Ø50 to Ø150 × 10 — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/spoked-flywheels/  (CC BY 4.0)
Basis: Rim Ø D × 10, five spokes 5 wide, Ø5 (Ø50) or Ø8 bore, radial M3 tapped hole
Catalog version: 2026-10-20

Sizes: see table below
- A Ø D × 10 wheel with five 5 mm spokes and a Ø5 (Ø50 wheel) or Ø8 (Ø80–150) bore; a radial Ø2.5 hole (M3 tap drill) at mid-thickness locks it to the shaft.
- Between the spokes the wheel is hollow inside: the band from 0.18 D radius to 8 mm inside the rim is a closed void with 1.5 mm faces on both sides.
- On the Ø80–Ø150 files the spoke ends stand proud of the rim; the overall size is in the table.
- Energy stored at a given speed goes with the fourth power of diameter, so diameter does more than thickness.

file  rim Ø  thickness  bore  overall (spoke ends)
flywheel-50  50  10  5  50 × 50
flywheel-80  80  10  8  83.6 × 84.5
flywheel-100  100  10  8  106.0 × 108.1
flywheel-120  120  10  8  128.4 × 131.7
flywheel-150  150  10  8  162.0 × 167.0

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Wikipedia: Crank (mechanism) — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Crank_(mechanism)
- Wikipedia: Flywheel — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Flywheel
- Wikipedia: Stirling engine — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Stirling_engine
- Long Earth Society: Engine builds that use these parts (videos and write-ups) — web, video — LES site — https://longearthsociety.com/engineering/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 5 parts): https://xemstudio.com/files/hardware/spoked-flywheels/index.json
API: https://xemstudio.com/api/geometry?object=spoked-flywheels