Original Tyre:

Your tyre size: 145 155 165 175 185 195 205 215 225 230 235 245 255 265 275 285 295 305 315 325 335 / 30 35 40 45 50 55 60 65 70 75 80 85 R 12 13 14 15 15.5 16 16.5 17 18 19 19.5 20 21 22 23

Result:

New Tyre:

Your tyre size: 145 155 165 175 185 195 205 215 225 230 235 245 255 265 275 285 295 305 315 325 335 / 30 35 40 45 50 55 60 65 70 75 80 85 R 12 13 14 15 15.5 16 16.5 17 18 19 19.5 20 21 22 23

Result:

Formula of Tyre Pressure When Change the Tyre Size:

Original Tyre Max Load Rating (lbs) Original Tyre Max Pressure (P.S.I.) OEM Recommended Tyre Pressure ( P.S.I.)

New Tyre Max Load Rating (lbs) New Tyre Max Pressure (P.S.I.)

New Tyre Air Pressure ( P.S.I.)

Rim Width Calculater: (Add or Minus Max 0.2 digits for Rim Size)

Tyre Side Wall Ratio From 80 to 60:

Tyre Size (mm)

Rim Size (Inch):

Soft Ride (comfort) 70 % Med Soft Ride (comfort) 75% Quick Sterring Response, Hard Ride, (sporty), (Performance) 80%

Tyre Side Wall Ratio From 55 to 50:

Tyre Size (mm)

Rim Size (Inch):

Soft Ride (comfort) 75 % Med Soft Ride (comfort) 80%

Tyre Side Wall Ratio From 45:

Tyre Size (mm)

Rim Size (Inch):

Rim Size

Tyre Size width:

Comfort: Hard: 80% for low profile:

Circumstance & Diameter calculator:

Original Tire size	New Tire size
Width: Ratio: Rim Size:	Width: Ratio: Rim Size:
Diameter mm Circumstance mm	Diameter mm Circumstance mm
Diameter difference mm : Circumstance difference mm : Percent
Original tire size traveling distance: Original tyre size car km reading :
New modify tire size traveling distance: Modify tyre size car km reading:

Air Pressur calculate by Car weight:

Gross Weight of Car(kg) Tyre Width(mm)

Air Pressure (kg) bar kg psi

Tyre width: Air pressure: New tyre width:

New air pressure

Rim width: Air pressure: New rim width:

New air pressure

Converter:

Kg: Psi:

Psi: Kg: