What is the best anti-theft device for a motorcycle?

The honest answer disappoints people: there is no single best device, because every device fails against a different attack. The best anti-theft setup is layers — each one covering another's weakness.

• Alarmed disc lock — stops the opportunist who'd roll your bike away, and makes noise when tampered with. Weakness: does nothing against two guys lifting the bike into a van.
• Heavy chain + ground anchor (or street furniture) — the single biggest deterrent to the van attack, because the bike physically can't leave. Weakness: heavy to carry, and hardened tools beat cheap chains, so buy quality.
• Cover — cheapest layer there is. Thieves shop by model; a covered bike is an unknown. Weakness: pure friction, stops nobody determined.
• Hidden GPS tracker — the only layer that works after the theft. Motion alerts tell you the moment the bike moves; live location gives police somewhere to go. Weakness: it doesn't prevent anything — it's your recovery plan.

If you're forced to rank: the chain-and-anchor prevents the most thefts, and the tracker recovers the most bikes. Prevention layers deal with amateurs; against a professional crew that beats your locks anyway, the tracker is the layer that still matters. Run both ends of the equation.

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the Stealth magnetic GPS tracker