Assembly Guide

Table of contents


Bill of Materials

For new builds, we strongly recommend Version 3 with a PCB kit for the easiest assembly experience. Version 2 offers an exciting option for builders that want to solder their own PCB with an esp32 devkit.

This sourcing guide assumes you have a compatible spin bike.

You should be able to source all components for < $100 USD including shipping

Required Hardware

The components in this list are required for the assembly of all versions of the SmartSpin2K

SmartSpin2K Hardware

Quantity Part Source
1 PCB + wiring harness kit Official Resellers
1 38mm NEMA 17 Stepper Amazon, Aliexpress
1 12 or 24V Power Supply* Amazon, Aliexpress
2 608 Skate Bearings Amazon, Aliexpress
1 5/16” x 1-1/2” hex head bolt  
1 5/16” washers  
2 5/16” nuts  
4 #8 x 1.75” countersunk wood screws  

*Power supply can be in the 12v-24v range. Aim for 1amp or greater. If using the SmartSpin2K PCB Kit, you will need a 5.5x2.1 connector.

Shifter Hardware

Quantity Part Source Shifter Version
1 Shifter PCB Kit Official Resellers, Self-Source PCB Shifter
2 Tactile Switches Amazon, Aliexpress DIY Shifter
1 Stereo RCA–>3.5mm headphone “Y” Cable Aliexpress DIY Shifter

Self-sourced PCB Hardware (Version 2)

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In addition to the common hardware listed above, you will need the following hardware to build SmartSpin2k Version 2

Quantity Part Source
1 ESP32 Dev Board Amazon, Aliexpress
1 TMC2225 Amazon, Aliexpress
1 JST-XH connectors kit Amazon
1 3.5mm stereo headphone connector (shifter connector) Aliexpress
1 5.5X2.1mm Dc Power connector Aliexpress
1 PCB PCBWay
1 Recom R-78E5.0-0.5 Octopart
1 10uF 50V capacitor (6mm diameter or smaller) Octopart
1 100uF 25V capacitor (6mm diameter or smaller) Octopart
1 0.1uF 50V capacitor Octopart
1 1K Ohm resistor Octopart

Review readme documentation if using published mods like the direct mount.

Printing Instructions

We recommend printing in a strong material like ABS, CF-Nylon, or PETG. Use 4 perimeters and 40% infill.

You will need the following common parts for Version 3:

You will also need the specific parts to adapt to your bike:

How to build the SS2K

Hardware Version Link to Guide
Version 3 Download Assembly Manual
Version 2 Watch Video

Shifter Assembly

Hardware Version Link to Guide
PCB Shifter Github
Hand wired Shifter Watch Video