15 : 43
KLR650 · 15/43 steel
15/43 · 520
The KLR650's stock gearing on 520 chain: a 43T steel rear with six broad spokes and big rounded windows, on Kawasaki's 520 street pattern (6 × 10.5 mm on 104, 80 mm centre).
Sample · 15/47 · 520
R6 · 15/47 lattice
A 520 conversion for an R6 on Marchesini wheels: a 47T aluminium rear whose ten forked spokes cross into a lattice, on Marchesini's five-bolt pattern (5 × 10 mm on 100, 76 mm centre).
Build it with your AI
Using the CheapCAD Tools connector, design a two-sprocket drive in Sprocket Designer on 520 motorcycle roller chain (ISO 10190), 110 chain links. Sprocket 1: 15 teeth, a front (countershaft) sprocket held by a nut and tab washer; an ISO 4156 involute spline bore, module 1, 20 teeth, 30° pressure angle (a sample spline: use your bike's). Sprocket 2: 47 teeth, a rear sprocket; a 100 mm bolt circle (BCD) with 5 bolts, 10 mm holes; a 76 mm centre bore; spokes: overlapping spokes, 10 of them, Hub OD 124 mm, Rim Depth 12 mm, Spoke Width 11 mm, Fillet at Rim 3 mm, Fillet at Hub 3 mm. 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 · 15 teeth
- 15T 520 countershaft sprocket, involute spline (m 1 × 20, a sample, not the bike's), nut held
- 159 MPa peak · SF 2.61 in 4140 steel · rim moves 0.06 mm · 5.94 mm plate · 69 % solid
Sprocket 2 · 47 teeth
- 47T 520 rear, 5 × 10 mm on 100
- 127 MPa peak · SF 3.95 in 7075-T6 · rim moves 0.29 mm · 5.94 mm plate · 55 % solid
Notes
- The rear is a Sprocket Designer original: ten overlapping spokes in a lattice.
- The front's involute spline (module 1, 20 teeth) is a sample, not the Yamaha YZF-R6 (Marchesini wheel)'s countershaft spline: set your own spline in the app before you make a front.
- The rear's bolt pattern is the app's preset, taken from retailer listings: an approximation, not a fitment guarantee. Measure your own hub.
- Strength figures are at 352 N·m at the countershaft, an estimate from peak engine torque in first gear: 65.7 N·m × 2.073 × 2.583 (published R6 specs).
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.
More samples
Related drives
13 : 49
YZ250F · 13/49 offset spokes
13/49 · 520
Short motocross gearing: a 49T aluminium rear with six tapered spokes, each rim end turned 7° round of its hub end, on the Japanese motocross pattern (6 × 8.5 mm on 150, 125 mm centre).
13 : 48
KTM 350 EXC-F · 13/48
13/48 · 520
Enduro gearing: a 48T aluminium rear with six spokes tapering from 22 mm at the hub to 14 mm at the rim, on KTM's pattern (6 × 8.5 mm on 150, 125 mm centre).
15 : 45
ZX-6R · 15/45 swept
15/45 · 525
Track gearing two teeth shorter than stock, on 525 chain: a 45T aluminium rear with six swept spokes, on the ZX-6R's pattern (6 × 8.5 mm on 100).