Tyre size is blank

The Tyre Dosage calculator advises OKO's recommended dosage for any tyre size.
To use this calculator:

1. Enter the size shown on the tyre

2. Select the OKO product you are using

3. Click the 'Check' button

The calculator will display the correct dosage.

If you are not sure you have entered the correct tyre description, read "Tyre Description" which describes the dimensions of the tyre as interpreted by the calculator.

The calculator supports the following tyre size formats

• 4.10/3.50-4 (where the tyre sidewall is smaller than 25 inches)
• 3.00-4
• 3.00L-4
• 11.2R24
• 11.2LR24
• 280/85R24 (where the aspect ratio is between 30% and 110%)
• 280/85-24 (where the aspect ratio is between 30% and 110%)
• 19.0/45-17 (where the aspect ratio is between 30% and 110%)
• 19.0/45R17 (where the aspect ratio is between 30% and 110%)
• 13x5.00-6
• 13x5.00R6

NOTE: do not include the load index and speed rating when entering the tyre size.

Therefore, "185 / 55 R15 81H" should be entered as "185 / 55 R 15".

Click TROUBLESHOOTING
for a full troubleshooting guide

If you have any problems or need assistance, call + 44 (0) 2381 550 058 or email [email protected]

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