Road Bike Gear Calculator
Analyze your top speed and climbing gears. Perfect for comparing Compact vs. Standard cranksets.
Drivetrain Setup
Standard: 53/39, Compact: 50/34, Mid: 52/36
Smallest: 11, Largest: 28-34
Typical race cadence: 90-100
Calculated on standard 700x25c tires.
Road Bike Gearing: Compact vs. Standard
One of the biggest choices road cyclists make is selecting their crankset. This determines your overall gear range and efficiency on different terrains.
Standard (53/39t)
The racer's choice. Offers high top-end speed for sprints and descents.
Top Gear (53x11): ~32 mph at 90 RPM.
Best For: Flat terrain, Criteriums, Pro Racing.
Compact (50/34t)
The climber's choice. The smaller 34t inner ring makes climbing mountains much easier.
Low Gear (34x32): Almost a 1:1 ratio.
Best For: Gran Fondos, Mountains, Beginners.
The "Semi-Compact" (52/36t)
Many modern road bikes now come with a Mid-Compact (52/36) crankset. This attempts to offer the best of both worlds: a 52t big ring that is almost as fast as a standard, and a 36t inner ring that is decent for climbing.
Cassette Selection: 11-28 vs 11-34
While the front chainrings define your range, the rear cassette defines your fine-tuning.
- Tight Range (11-25 or 11-28): Small jumps between gears (e.g., 1 tooth differences). This allows you to find the perfect cadence on flat roads.
- Wide Range (11-32 or 11-34): Larger jumps between gears, but offers a "bailout" gear for steep hills. Modern rear derailleurs (GS cage) are required for these.
Wattage & Efficiency
Using this calculator helps you find your "sweet spot." Grinding a big gear at 60 RPM relies on muscular force (tiring your legs). Spinning a lighter gear at 90 RPM relies on aerobic system (tiring your lungs). Most coaches recommend staying between 85-95 RPM for optimal efficiency.
Check your exact Cadence to Speed to see how fast you would be traveling at different RPMs in your target gears.