Short answer: a 100cc motorcycle or moped can typically reach top speeds in the 45–72 mph (72–116 km/h) range, with common street models often around 50–60 mph (80–97 km/h). Actual performance depends on engine tuning, weight, gearing, and whether it’s a two-stroke or four-stroke, as well as whether the vehicle is built for efficiency or outright speed. Acceleration from 0 to 60 mph (0–100 km/h) is usually in the 5–12 second range for many practical 100cc bikes, though highly tuned or lighter setups can be faster. Details by context

• Street-legal 100cc bikes: Typical top speeds around 50–60 mph (80–97 km/h), with some models capable of approaching 70 mph (112–116 km/h) under favorable conditions.

• Dirt/mini bikes: Often faster to 60 mph or more, with 0–60 mph times commonly in the 3–6 second window for well-tuned 100cc setups, depending on weight and gearing.

• Scooters and mopeds: Many 100cc scooters target 45–60 mph (72–97 km/h) top speeds, though some economical or low-tune variants may stay closer to 40–50 mph (64–80 km/h).

Important caveats

• Modifications (exhaust, intake, ignition timing, gearing) can significantly change both top speed and acceleration, sometimes risking reliability or legality.

• Real-world numbers vary by model, rider weight, terrain, and maintenance condition. Test data from specific models (e.g., popular 100cc bikes) show tops commonly in the 55–68 mph range, with exceptional or highly modified examples exceeding that.

If you’d like, specify the exact bike type (street 100cc motorcycle, dirt/mini bike, or scooter/moped) and a few model examples, and the answer can be tailored with model-specific top speeds and 0–60 mph times.