Biker Shack is a Harley-Davidson service and parts specialist in Alpine at 2226 Alpine Blvd, handling V-twin engine rebuilds, dyno tuning, and custom fabrication for cruiser and touring platforms. The shop holds Dunlop authorized dealer status for motorcycle tires, stocking the D401/D402 cruiser compounds and the Sportmax sport-touring range alongside the Harley-specific inventory at Coyote's Motorcycle Tires on eastern Alpine Blvd. Alpine Blvd's position as a gateway to Cleveland National Forest and the Sunrise Highway run draws weekend riders through the shop for pre-ride inspections, chain adjustments, and brake-pad swaps before tackling mountain-grade switchbacks. Performance upgrades include cam installations, exhaust system swaps, and fuel-management reflashes, with before-and-after dyno pulls confirming horsepower and torque gains on the in-house dynamometer. Suspension geometry work — fork-spring swaps, shock-preload adjustments, and steering-head bearing replacement — complements the race-oriented suspension tuning at Suspension101 in Alpine for riders seeking a canyon-carving baseline setup. The dynamometer measures rear-wheel output across the full RPM band on Twin Cam 88, 96, 103, and Milwaukee-Eight 107/114/117 powerplants, generating torque curves that inform cam-profile and exhaust-header selection.