Sample · BMX race 43/16

43/16 · drilled race ring

Four-bolt 104 BCD ring, drilled, on a 16T cog.

BMX racing43 : 16

Build it with your AI

Using the CheapCAD Tools connector, design a two-sprocket drive in Sprocket Designer on 081C (⅛" single-speed bicycle) roller chain, 94 chain links. Sprocket 1: 43 teeth, a chainring; a 104 mm bolt circle (BCD) with 4 bolts; a 89.8 mm centre opening; spokes: a drilled web, Rim Depth 4 mm; no tooth chamfer. Sprocket 2: 16 teeth, a sprocket; a 34.9 mm bore; no tooth chamfer. Check the design and keep it as given: its one note, ASME's advice to use an odd tooth count on sprocket 2's 16 teeth, is expected for this gearing, so don't apply that Auto-fix, 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 · 43 teeth

43T · ⅛" single speed · chainring · 104 BCD × 4 · drilled
64 MPa peak · SF 7.90 in 7075 · rim moves 0.08 mm · 3.07 mm plate · 63 % solid

Sprocket 2 · 16 teeth

16T · ⅛" single speed · sprocket · bore Ø34.9
94 MPa peak · SF 5.35 in 7075 · rim moves 0.06 mm · 3.07 mm plate · 53 % solid

Notes

The driven has 16 teeth: under 25, an odd count spreads wear (ASME B29.1 A-5).

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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