Very High Flexion tyres (VF)
The VF standard was developed as the main VT-TRACTOR feature. VF describes a pneumatic tyre structure in which the casing is more resistant than that of the corresponding standard tyre*.
Compared to standard tyres, the main benefit of the VF standard is that it allows the VT-TRACTOR tyre to operate at lower pressure in the field, which reduces soil compaction. It allows the vehicle to carry more load on the road, which means making fewer transport cycles. Finally, it is capable of driving at higher speed when moving from the field to the road since the load capacity is now independent of speed and there is no need to adapt inflation pressure.
* According to ECE R106 para 2.20.1.
Narrow Rim Option (NRO) technology
Adding to the benefits of VF, the VT-TRACTOR provides the extra advantage of being fitted on standard rims. Indeed, VF tyres usually require wider rims, making it necessary to purchase new rims when switching from standard to VF tyres. However, a new Experimental Standard has been introduced in E.T.R.T.O. (European Tire and Rim Technical Organization), called NRO (Narrow Rim Option), which enables VF tires that would normally require a wider VF rim to also be fitted on a standard rim*.
* Please consult Bridgestone technical product information for more details on which tyres are NRO marked and the complete range of rim widths that can be used on VT-TRACTOR products.