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Motorcycle Tire Air Pressure Conversions

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Background

Motorcycle tire performance is critical, and the air pressure of the tire is crucial.

Some owner's manuals or other information lists motorcycle tire air pressures in various units of measurement.

This chart (below) converts pounds per square inch, or psi, into the SI unit.

The official SI unit for pressure is the Pascal (Pa = N/m2 = kg/ms2) or kiloPascal (kPa = 1000 Pa).

SI is an abbreviation for Système International d'Unitès, or the International System of Units.

MMore on Air Pressure
Formulas

Note: Pressure is any force which acts against a surface. The formula to define pressure is P = F/A where F is force and A is surface area.

Some motorcycle tire pressures are listed in psi (pounds-force/square inch), and others in kPa. Atmospheric pressure is approximately 100 kPa. The use of "kg/cm2" is a non-standard measurement.

Motorcycle Tire Air Pressure Conversions
kPa = psi * 6.89476
kg/cm2 = psi * 14.223343
bar = kg/cm2 * 0.980655
psi kPa kg/cm2 bar
20 138 1.4 1.4
21 145 1.5 1.4
22 152 1.5 1.5
23 159 1.6 1.6
24 165 1.7 1.7
25 172 1.8 1.7
25.5 176 1.8 1.8
26 179 1.8 1.8
26.5 183 1.9 1.8
27 186 1.9 1.9
27.5 190 1.9 1.9
28 193 2.0 1.9
28.5 197 2.0 2.0
29 200 2.0 2.0
29.5 203 2.1 2.0
30 207 2.1 2.1
30.5 210 2.1 2.1
31 214 2.2 2.1
31.5 217 2.2 2.2
32 221 2.2 2.2
32.5 224 2.3 2.2
33 228 2.3 2.3
33.5 231 2.4 2.3
34 234 2.4 2.3
34.5 238 2.4 2.4
35 241 2.5 2.4
35.5 245 2.5 2.4
36 248 2.5 2.5
36.5 252 2.6 2.5
37 255 2.6 2.6
37.5 259 2.6 2.6
38 262 2.7 2.6
38.5 265 2.7 2.7
39 269 2.7 2.7
39.5 272 2.8 2.7
40 276 2.8 2.8
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