Tools you might need next
Calculate bicycle gear ratios, gear inches, and development for any chainring and cassette cog combination on your bike.
Find the correct bicycle frame size from inseam, height, and riding style for road, mountain, hybrid, and gravel bicycles.
Calculate bicycle spoke length from hub flange diameter, rim ERD, lacing pattern, and number of crosses for wheel building.
Rear tires typically carry 55% to 60% of total system weight. Front gets the remainder for balanced grip and comfort.
rear load ≈ 0.55–0.60 × (rider + bike + gear weight)Wider tires need lower pressure for the same contact patch feel. Volume scales with width and internal rim width.
Smooth road favors higher pressure; rough gravel and cobbles benefit from lower PSI to reduce vibration and pinch flats.
Updated: July 2026
Find PSI for 47 mm tires on mixed terrain with 180 lb total system weight.
Compare pressures for 25 mm vs. 32 mm tires at the same rider weight.
Add pannier or frame bag weight and bump rear tire pressure slightly.
Use weight- and width-based pressure. Max PSI often reduces grip and comfort.
Include bike, bottles, and bags in total system weight for accurate load.
Stop guessing PSI from the sidewall max. Enter total rider-bike weight, tire width, and terrain to get a starting pressure range for front and rear.