Motorcycle Swingarm Pivot-to-Countershaft Arc & Tightest-Point Chain-Slack Solver

Deterministic Planar law-of-cosines swingarm arc locus L(theta) + dual-sprocket common tangent belt/chain wrap perimeter maximization at collinearity engine (.json, .pdf, .svg) built for KTM / Husqvarna, Yamaha YZ/WR, Ducati, DID / RK Takasago — zero-upload ephemeral Wasm RAM execution.

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