Updated
To be confirmed by PowerTred
IF means increased flexion; VF means very high flexion. These tyre designs support different load and inflation relationships from conventional tyres.
CFO means cyclic field operation. It refers to specified cyclic field working conditions rather than a general road-use allowance.
Use the tyre manufacturer's load and inflation tables for the exact tyre and operating conditions. Do not assume a designation alone establishes suitability.