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 · 13/48 · 520
KTM 350 EXC-F · 13/48
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).
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), 112 chain links. Sprocket 1: 13 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: 48 teeth, a rear sprocket; a 150 mm bolt circle (BCD) with 6 bolts, 8.5 mm holes; a 125 mm centre bore; spokes: tapered spokes, 6 of them, Hub OD 172 mm, Rim Depth 7 mm, Width at Rim 14 mm, Width at Hub 22 mm, Fillet at Rim 4 mm, Fillet at Hub 5 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 · 13 teeth
- 13T 520 countershaft sprocket, involute spline (m 1 × 20, a sample, not the bike's), nut held
- 136 MPa peak · SF 3.05 in 4140 steel · rim moves 0.05 mm · 5.94 mm plate · 65 % solid
Sprocket 2 · 48 teeth
- 48T 520 rear, 6 × 8.5 mm on 150
- 181 MPa peak · SF 2.77 in 7075-T6 · rim moves 0.38 mm · 5.94 mm plate · 41 % solid
Notes
- The rear's look is styled after the Moose Racing dual-ring rear (six tapered spokes, long windows). The look only: it is not that maker's part or dimensions, and no maker endorses it.
- The front's involute spline (module 1, 20 teeth) is a sample, not the KTM 350 EXC-F'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 254 N·m at the countershaft, an estimate from peak engine torque in first gear: 37 N·m × 72/24 primary × 32/14 1st (KTM; spec listings).
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).
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).
13 : 51
KX450 · 13/51 mud
13/51 · 520
Mud-race gearing: a 51T steel rear with a notch at the bottom of every tooth gap to shed packed mud, and six wide spokes, on the Japanese motocross pattern (6 × 8.5 mm on 150, 125 mm centre).