Sample · Road 52/36 · 11-34, big ring

52 × 15 · mid-compact big ring

Windowed between the tabs, 110 × 4.

Road52 : 15

Build it with your AI

Using the CheapCAD Tools connector, design a two-sprocket drive in Sprocket Designer on 12sp (12-speed bicycle) roller chain, about 410 mm between centres. Sprocket 1: 52 teeth, a chainring; a 110 mm bolt circle (BCD) with 4 bolts in the shimano pattern; a 95.8 mm centre opening; spokes: a windowed web, Band OD 104 mm, Rim Depth 8 mm, Tab Wall ×2 18 mm; no tooth chamfer. Sprocket 2: 15 teeth, a cog; an ISO 14 straight-sided spline bore: 9 splines, minor diameter 32.5 mm, major 34.75 mm, width 6.25 mm, one key slot 3.25 mm wide (the Shimano HG cassette spline); no tooth chamfer. Check the design, apply any Auto-fix it suggests, then export both sprockets as STL and give me the download link.

Paste it into Claude, ChatGPT or any AI app with the CheapCAD Tools connector, and it designs this drive with you, checks it and hands you the files. How to connect your AI.

What's in this design

Sprocket 1 · 52 teeth

52T · 12-speed · chainring · 110 BCD × 4 Shimano · windowed
235 MPa peak · SF 2.14 in 7075 · rim moves 0.48 mm · 2.05 mm plate · 33 % solid

Sprocket 2 · 15 teeth

15T · 12-speed · cassette cog · Shimano HG spline
192 MPa peak · SF 2.62 in 7075 · rim moves 0.11 mm · 1.60 mm plate · 51 % solid

The link opens both sprockets and the chain in the Sprocket Designer's 3D Mode. Change the teeth, bore, hub or spokes, then download STL, STEP, DXF or SVG. Strength figures are the app's plane-stress check of each sprocket in the material it names; SF is the safety factor.

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