GrabCAD 模型信息
Yamaha YZ250F Sprockets 13T & 49T, 520 Chain, Offset Spokes · 模型 127266
Yamaha YZ250F, 13/49 · 520 chain. 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). Design: an original, not based on any maker's part (six tapered spokes set at an angle). Parts - Front: 13T 520 countershaft sprocket, involute spline (m 1 × 20, a sample, not the bike's), nut held. - Rear: 49T 520 rear, 6 × 8,5 mm on 150 (bolt pattern approximate). Strength (an estimate) - Load: 254 N·m: the dirt bikes' load, the KTM 350 EXC-F's 37 N·m × 72/24 × 32/14. - Front: 136 MPa peak · SF 3,05 in 4140 steel · rim moves 0,05 mm · 5,94 mm plate · 65 % solid. - Rear: 91 MPa peak · SF 5,53 in 7075-T6 · rim moves 0,21 mm · 5,94 mm plate · 52 % solid. - Plane-stress FEM of each plate: the chain pulls on the first three engaged teeth (50/30/20 %), both directions; a rear is held at its bolts, a front at its spline. Before you make one - The front's spline (m 1 x 20 involute) is a sample, not the bike's. Change it to your countershaft's spline. - The bolt pattern and centre hole are approximate. Measure your hub or old sprocket first. - These are design samples, not tested parts. Files - STEP: yz250f-13x49-drive, the drive at true size (front, rear and chain) - STEP: yz250f-13x49-front and yz250f-13x49-rear, each sprocket on its own - STL: yz250f-13x49-front and yz250f-13x49-rear, for 3D printing (with print compensation: outline slightly smaller, holes slightly larger; use the STEP for true size) Made with the CheapCADTools Sprocket Designer. Licence: Creative Commons Attribution (CC BY). Please credit CheapCADTools when you share it.
- 格式
- STEP / IGES、STL、Rendering
- 分类
- Automotive、Components、Machine design
- 标签
- stl、step、roller chain、520 chain、countershaft sprocket、front sprocket、rear sprocket、motorcycle sprocket、aluminium sprocket、motocross、yamaha、yz250f
- 数据更新
- 2026-10-17T13:49:51Z
