Dylan Banera

WorkBike Projects

Sheet 18 of 23

Crank arms and a 3-piece crankset

Crank arms I printed, some in resin and some in powder, with different pocket patterns, a printed chainring and guard, and a 3-piece crankset I designed in Fusion 360 for TBD Bikes.

Date
Feb 2025
Media
10 photos
Crankset CAD
Fusion 360
Printed arms
Some resin, some powder-bed prints
Disciplines
Bikes3D PrintingCAD
Fig. 01A pair of printed arms with a hex-cell latticeEnlarge

Notes

I printed these crank arms with different pocket patterns: a long pocket on the front with X-shaped ribs behind it, hex-cell lattices in two cell sizes, and three rounded pockets. Most have a square spindle hole. Some of the arms are resin prints and some are powder-bed prints. The last photo also shows the printed guard and part of the chainring.

In spring 2025 I also designed a 3-piece crankset in Fusion 360 as part of a set of parts for TBD Bikes, in SRAM 3-bolt and Shimano direct-mount versions, plus the same crank design for ISIS-drive e-bikes with Bosch motors. The two renders show the SRAM 3-bolt and e-bike versions, and the CAD video on the MTB stem page shows the arms being modelled. The rest of the set is on the BMX stem and pedal pages.

Photos

9 figures

Fig. 02Close-up of the hex cells and the threaded holes at each end
Fig. 03Side view of a hex-cell arm, with the raised boss at the spindle end
Fig. 04Hex-cell versions with two cell sizes
Fig. 05Two arms with three rounded pockets and square spindle holes, in two finishes
Fig. 06The 3-piece crankset in CAD, SRAM 3-bolt version
Fig. 07The same crank design for ISIS-drive e-bikes (Bosch motors), in CAD
Fig. 08The front of the arm: a round boss and a long pocket
Fig. 09The back of the same arm: X-shaped ribs and a toothed boss at the spindle end
Fig. 10A long-pocket arm with the printed guard and part of the chainring