Motorcycle Tire Pressure Calculator

Motorcycle profile:

Use the motorcycle manual or information plate whenever it is available.

Ride load:

Starting point:

The sidewall maximum is a ceiling, not a normal road target.

Manual cold pressure:

Changing the unit preserves the same physical pressures.

Front Rear

Manual loaded pressure:

Both values must be supplied to use the manufacturer loaded baseline; zero keeps the bounded fallback adjustment.

Front Rear {{ pressureUnitLabel }}

Motorcycle wet weight:

Use wet weight rather than dry brochure weight.

Rider weight:

Passenger weight:

Luggage weight:

Tire section width:

Front and rear values are millimetres from the fitted tire markings.

FrontRearmm

Surface:

Normal street leaves the baseline unchanged.

Riding goal:

Balanced leaves the baseline unchanged.

Tire construction:

Tubeless radial is the neutral construction.

Weather:

Dry or mild leaves the baseline unchanged.

Tire condition:

Fresh or even wear leaves the baseline unchanged.

Front load share:

{{ front_load_percent }}%

The profile default is shown; changing this slider overrides the profile split.

Cold temperature scenario:

The projection uses the preserved planning rule of roughly 1 psi per 10 deg F.

CheckLater

Current cold readings:

Use the same unit as the manual pressure fields; leave zero for target-only guidance.

FrontRear{{ pressureUnitLabel }}

Known pressure ceilings:

A tire sidewall maximum is never used as the normal target.

FrontRear{{ pressureUnitLabel }}

Wheel	Load	Baseline	Set cold	Gauge action	Later cold	Safe window	Copy
{{ row.wheel }}	{{ row.load }}	{{ row.baseline }}	{{ row.target }}	{{ row.action }}	{{ row.forecast }}	{{ row.window }}

Before setting pressure

Calculation basis

Target = clamp(profile or manual baseline + bounded load/fitment adjustments)

This is a repo-authored planning heuristic. The motorcycle manual, vehicle plate, tire maker guidance, and the lowest applicable equipment limit take priority.

The correct road pressure begins with the motorcycle manufacturer's cold specification. That front-and-rear pair accounts for the motorcycle, approved tire sizes, load limits, and handling design. A generic bike category can offer a rough starting point when the handbook is unavailable, but it cannot establish the correct pressure for a particular motorcycle and tire combination.

“Cold” describes tires that have settled near ambient temperature before the ride. Riding flexes and heats the tire, so the gauge reading normally rises. Bleeding a warm tire down to the cold target can leave it underinflated after it cools.

Cold specification: The front and rear pressures printed by the motorcycle manufacturer in the owner's manual or on the information plate.
Loaded specification: A separate manufacturer value, when published, for a passenger, luggage, or maximum permitted load.
Sidewall maximum: The pressure associated with the tire's rated maximum load. It is a ceiling, not the ordinary road target.
Cold reading: The gauge pressure measured before riding, using a reliable gauge and tires near ambient temperature.

Extra load does not justify guessing above the manufacturer's limits. A passenger and luggage often place more additional demand on the rear tire, but the motorcycle's loaded row and maximum vehicle load remain the authority. Overloading is unsafe even when the tire itself has a higher sidewall rating.

Pressure that is too low increases carcass flex and heat and may harm handling and tire life. Pressure that is too high can make the tire more vulnerable to impact damage and alter ride and grip. Uneven wear, cupping, a squared rear profile, cracking, bulges, vibration, puncture damage, or repeated air loss calls for inspection rather than a formula-based correction.

Road, track, and off-road settings are not interchangeable. Tire makers may publish tire-specific track guidance, and serious trail use can involve rim locks, tube choice, terrain, and speeds that a street-oriented estimate does not model. Use the result only as a conservative planning comparison around a verified cold specification.

How to Use This Tool:

Anchor the plan to the owner's manual or information plate whenever possible. Use the profile baseline only as a temporary fallback.

Choose the motorcycle profile and ride load. Select the manual starting point and enter the published cold front and rear values; add loaded values only when the manufacturer provides them.
Set pressure and mass units before entering values. Use wet motorcycle weight, rider weight, and only the passenger or luggage actually included by the selected load mode.
Enter the fitted front and rear tire section widths. Keep the default front load share unless you have a defensible measured or published value.
Select surface, riding goal, tire construction, weather, and tire condition as planning assumptions. These factors belong to the heuristic and do not override published pressures.
Enter current front and rear readings only when the tires are cold. Those readings produce Add, Bleed, or Hold guidance against the calculated target.
Review any minimum or maximum boundary warning before adjusting pressure. A sidewall ceiling below the planning minimum is rejected; a clamped target needs manual and tire-limit review.

Interpreting Results:

Front target and Rear target are half-psi planning values. The smaller preferred band describes the neighborhood around each target. The wider planning window is a model guardrail, not permission to choose any value inside it.

A manual loaded baseline has more direct relevance than an adjusted solo baseline. A profile baseline carries the greatest uncertainty. If a target reaches the model minimum or maximum, stop treating the numerical adjustment as routine and verify the motorcycle specification, fitted tire limits, load, and condition.

Forecast pressure estimates how an otherwise unchanged cold reading may move with ambient temperature. It is not a warm-tire target and does not justify bleeding pressure after a ride.

Technical Details:

The calculation is a planning heuristic rather than a manufacturer specification. It starts from either manufacturer values entered by the user or a motorcycle-profile fallback, distributes total ride mass between the wheels, applies bounded adjustments, clamps the result to a model window, and rounds to the nearest 0.5 psi.

Formula Core:

Total ride mass includes wet motorcycle, rider, and the passenger or luggage enabled by the selected load mode. Front load is total mass multiplied by the front-load share; rear load is the remainder.

\begin{matrix} W & = & W_{bike} + W_{rider} + W_{passenger} + W_{luggage} \\ W_{front} & = & W s \\ W_{rear} & = & W (1 - s) \end{matrix}

For each wheel, the raw target multiplies the baseline by the selected terrain, riding-goal, construction, and weather factors. It then adds load, profile-width, tire-condition, and ride-load biases.

p_{raw} = p_{0} f_{terrain} f_{goal} f_{construction} f_{weather} + a + w + c + l

The load adjustment a is the wheel load minus the profile's expected wheel load, divided by 16 kg for the front or 14 kg for the rear, then clamped from −2.5 to +5.5 psi. When the profile fallback is used, width adjustment w is reference width minus fitted width, divided by 25 and clamped from −1.5 to +1.5 psi. Width adjustment is zero for a manual baseline.

The final target clamps the raw value to the safe-range rules below and rounds it to the nearest 0.5 psi. The preferred band is target ± the larger of 1 psi or 3.5% for the front, and 1.5 psi or 4% for the rear; each endpoint is clamped and rounded to 0.5 psi.

\begin{matrix} p_{target} & = & {round}_{0.5} (clamp (p_{raw}, p_{\min}, p_{\max})) \\ Δp & = & \frac{T_{forecast} - T_{ambient}}{10} \end{matrix}

The temperature rule uses degrees Fahrenheit and adds about 1 psi per 10°F difference. Celsius inputs are converted first. This linear rule is an approximation for comparing cold ambient conditions, not a model of pressure rise during riding.

Profile Lookup Core:

Motorcycle profile baseline and reference values
Profile	Front / rear baseline (psi)	Reference mass (kg)	Front share	Reference widths front / rear (mm)
Sport / supersport	34 / 36	240	48%	120 / 180
Standard / naked	33 / 36	230	47%	120 / 180
Adventure / dual-sport	33 / 37	250	46%	110 / 150
Touring / sport-tourer	36 / 42	300	44%	120 / 180
Cruiser / bagger	36 / 40	320	42%	130 / 180
Scooter / commuter	30 / 32	180	46%	110 / 130

Factor and Bias Lookup Core:

Multiplicative pressure factors
Group	Choices and exact factor
Surface	Smooth street/freeway 1.02; normal street 1.00; rough pavement 0.97; hardpack/light gravel 0.94; loose washboard/trail 0.90
Riding goal	Sharper support 1.03; balanced 1.00; more compliance 0.97
Tire construction	Tubeless radial 1.00; tube-type 1.02; bias-ply cruiser 1.03; reinforced adventure carcass 1.01
Weather	Dry or mild 1.00; wet or colder grip 0.98; hot highway 1.01

Additive tire condition and ride load biases
Condition	Front bias	Rear bias
Fresh or even wear	0 psi	0 psi
Squared-off rear	0 psi	+0.75 psi
Cupped front	+0.5 psi	0 psi
Older or heat-cycled set	−0.25 psi	−0.25 psi
Luggage, without manufacturer loaded baseline	0 psi	+1.5 psi
Passenger, without manufacturer loaded baseline	+0.25 psi	+2 psi
Passenger and luggage, without manufacturer loaded baseline	+0.75 psi	+3.5 psi

A valid manufacturer loaded front-and-rear pair becomes the baseline for a loaded ride and suppresses the added load-mode bias. The mass-based load adjustment still applies.

Rule Core:

The initial front window is baseline minus 5 psi to baseline plus 6 psi, constrained to 26 to 44 psi. The rear window is baseline minus 4 psi to baseline plus 5 psi, constrained to 28 to 48 psi.

A rear width of at least 190 mm raises the minimum to at least 32 psi and may raise the maximum by 1 psi, capped at 49 psi.
A front width of at most 110 mm may lower the minimum by 1 psi, not below 25 psi, and lowers the maximum by 0.5 psi, not above 43 psi.
Tube-type or bias-ply construction adds 0.5 psi to the minimum.
An entered sidewall maximum lowers the model maximum but never establishes a target. A maximum below the resulting minimum invalidates the plan.
Current-reading adjustment equals target minus current cold reading. A gap smaller than 0.25 psi is shown as Hold; otherwise the action is Add or Bleed.

Validation Bounds:

Accepted motorcycle tire pressure planning input bounds
Input	Accepted range
Manual solo baseline	15 to 60 psi equivalent for each wheel
Manual loaded baseline	15 to 70 psi equivalent for each wheel; both values are required to activate it
Current reading or sidewall ceiling	0 to 70 psi equivalent; zero means not supplied
Wet motorcycle mass	40 to 700 kg equivalent
Rider mass	20 to 250 kg equivalent
Passenger and luggage mass	0 to 250 kg equivalent each
Front / rear tire width	70 to 180 mm / 90 to 300 mm
Front load share	38% to 55%
Cold ambient and forecast temperature	−40°F to 140°F equivalent

Pressure conversion uses 1 psi = 0.06894757293 bar, and mass conversion uses 1 lb = 0.45359237 kg. Calculation occurs in psi, kilograms, and degrees Fahrenheit before the selected display units are applied.

Safety Note:

The result is not a motorcycle or tire manufacturer's specification. Use the owner's manual or information plate for road pressure and loaded pressure, and never exceed the motorcycle's load limit or the applicable tire and wheel limits.

Check and adjust pressure cold with a reliable gauge; do not bleed a hot tire to the cold target.
Stop riding and seek qualified inspection for rapid pressure loss, visible damage, bulges, severe irregular wear, vibration, or suspected impact damage.
Obtain tire-specific guidance for track use, sustained high speed, severe off-road use, non-standard fitments, or repairs.

References:

Motorcycle Tire Safety and Maintenance Manual, Bridgestone.
Check Your Motorcycle Tire Pressure, Michelin, updated July 23, 2026.