Our custom calculator's algorithm produces results that are consistently within or extremely close to the widely accepted professional recommendations for all three major bike disciplines.

Features Included:

• Dual Unit Support: Toggles between Metric (kg/mm/Bar) and Imperial (lbs/inch/PSI).
• Total System Weight: Accounts for rider + bike + gear.
• Advanced Modifiers: Adjusts for Tubeless setups (allows lower pressure) and Wet Conditions (improves traction).
• Discipline Specifics: Distinct algorithms for Road, Gravel, MTB, and City/Hybrid.
• Front/Rear Bias: Calculates the 40/60 weight distribution physics (Front tires need less pressure than rear).

Road Bike Tire Pressure Chart (PSI)

(Assumes dry pavement, standard setup)

Tire Width (mm)	PSI (Imperial)	Bar (Metric)	Notes
23 mm	85 - 90	5.9 - 6.2	Narrow, high-speed tires
25 mm	80 - 85	5.5 - 5.9	Standard performance road
28 mm	70 - 75	4.8 - 5.2	Comfort and speed balance
32 mm	60 - 65	4.1 - 4.5	Endurance, rough pavement

Gravel Bike Tire Pressure Chart (PSI)

(Assumes mixed gravel/dirt terrain, tubeless setup)

Tire Width (mm)	PSI (Imperial)	Bar (Metric)	Notes
35 mm	38 - 42	2.6 - 2.9	Race gravel/Cyclocross
40 mm	34 - 38	2.3 - 2.6	Standard all-around gravel
45 mm	30 - 34	2.1 - 2.3	Rougher gravel/more comfort
50 mm (2.0")	25 - 30	1.7 - 2.1	High-volume, chunky terrain

Mountain Bike (MTB) Tire Pressure Chart (PSI)

(Assumes trail riding, tubeless setup)

Tire Width (Inches/mm)	PSI (Imperial)	Bar (Metric)	Notes
2.2" (56 mm)	20 - 24	1.4 - 1.7	XC/Hardpack trails
2.4" (61 mm)	18 - 22	1.2 - 1.5	All-Mountain/Trail
2.6" (66 mm)	16 - 20	1.1 - 1.4	Aggressive trail/Enduro

General Adjustment Guidelines

The pressures above are starting points. Always check the max pressure printed on your tire or rim sidewall.

Factor	Adjustment Rule
System Weight (Rider + Bike + Gear)	For every 10 kg (22 lbs) change in total weight, adjust PSI by +-2 (Road) or +-1b(Gravel/MTB).
Front Tire	The front tire carries around 40% of the load. Run the front pressure 3 to 5 PSI lower than the rear.
Tubeless Setup	If running tubeless, you can typically reduce the pressure by 5 to 10% for better grip and comfort.
Wet/Loose Terrain	Reduce pressure by 2 to 3 PSI for increased traction and control.
Riding Style	If you corner aggressively or ride rocky terrain, add 1 to 2 PSI to prevent tire "squirm" and protect rims.