Cycling Tools & Calculators
Frame size, Gear ratio, Skid patches, and Speed calculators
Tire Pressure Calculator
Calculate optimal tire pressure based on weight, tire size, and riding conditions
Frame Size Calculator
Find your ideal frame size based on measurements
📏 How to Measure Inseam:
- Stand barefoot against a wall with feet 6-8" apart
- Place a book between your legs, spine up against crotch
- Press firmly upward as if sitting on a saddle
- Mark the wall at the top of the book
- Measure from floor to mark - that's your inseam!
Recommended Size
56 cm
L — Range: 54-58 cm
- • Test ride recommended for final decision.
Gear Ratio Calculator
Calculate gear ratios, gear inches, and speed/cadence values
700c ≈ 678mm (622mm BSD + 2×28mm tire)
Primary Metrics
Speed @ Cadence
Skid Patch Calculator
Calculate the number of skid patches on your rear tire
What are skid patches?
Skid patches are the specific points on your rear tire that make contact with the ground when you skid. More patches = longer tire life.
Total Skid Patches
Basic patches (one foot)
34
Tire Life Multiplier
34x vs no patches
Recommendation
Excellent tire life! Great cog choice for longevity.
Patch Distribution
Speed/Cadence Calculator
Calculate speed from cadence or required cadence for target speed
700c ≈ 678mm (622mm BSD + 2×28mm tire)
Cadence Zones:
- • Recovery (< 70 RPM)
- • Endurance (70-90 RPM)
- • Tempo (90-110 RPM)
- • Sprint (110+ RPM)
Result
Speed @ 90 RPM
32.5 km/h
20.2 mph
Ratio: 2.82:1
Meters per minute: 541 m
Comprehensive Speed/Cadence Table
| Cadence (RPM) | Speed (km/h) | Speed (mph) |
|---|---|---|
| 50 | 18.0 | 11.2 |
| 60 | 21.7 | 13.5 |
| 70 | 25.3 | 15.7 |
| 80 | 28.9 | 17.9 |
| 90 | 32.5 | 20.2 |
| 100 | 36.1 | 22.4 |
| 110 | 39.7 | 24.7 |
| 120 | 43.3 | 26.9 |
| 130 | 46.9 | 29.1 |
| 140 | 50.5 | 31.4 |
Tire Pressure Calculator
Calculate optimal tire pressure based on weight, tire size, and riding conditions
Weights
Backpack, water bottles, tools, etc.
Front Tire
Measure internal width of rim
Rear Tire
Riding Conditions
Recommended Tire Pressure
System Summary
💡Tips & Recommendations
ℹ️Important Note
These are calculated recommendations based on industry formulas. Always check tire manufacturer's min/max pressure ratings. Adjust based on personal preference and road feel.
Scientific References & Methodology
Calculation Method
PSI = (Load_lbs / Tire_Width_mm) × 27.5- Tire Width: 0.75× - 1.10×
- Rim Width: 0.97× - 1.03×
- Riding Style: 0.90× - 1.10×
- Terrain Type: 0.88× - 1.0×
- Wheel Size: 0.98× - 1.02×
References
🔬Validation & Cross-Reference
This calculator's results have been validated against multiple industry sources including Silca, Rene Herse, and manufacturer recommendations. For critical applications, always cross-reference with at least two other sources and consult tire manufacturer specifications.