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- Select Master > Vehicle > File Maintenance from the RTA main menu (MVM).
- Enter a vehicle number or press F1 to select a vehicle from the lookup list.
- Select the General tab if it is not displayed on the screen.
- Enter the maximum tire count, including the spare, in the Max field. NOTE: You don't need to enter a count in the Tire count field because it's updated automatically as tires are mounted and dismounted.
- Save the record.