First of all on the maximum effort . 650 - 850 Newtons per meter is enough for carrying out tire work, this is just enough to unscrew and spin any wheel. The second is the size of the landing square, this is what kind of heads you can use with this wrench. In passenger tire, usually one second 1/2 inches. 
1/2 inch KingTony wrench
Working pressure - shows the maximum pressure at which it will give its maximum effort described in the characteristics.
It is worth paying special attention to the brand and country of origin. The best of the budget, pneumatic equipment, produced in Taiwan. Of the brands are King Tony, Hans, American Chicago Pneumatics. You can also choose from famous brands such as Nordberg. The main thing that the brand was known and they had the maintenance of this tool. The cost of such a wrench varies, in the range of 5000 rubles. up to 20,000 rubles.
Please note that for tire you need to have some more shock heads. Even when acquiring a wrench that has heads in the kit, understand that you need tire heads to be long and thin-walled. And the kits usually come with simple impact heads.
For truck tire fitting and freight service, they use more powerful wrenches for them to fit one inch square and maximum effort, from one and a half thousand newtons per meter.
1 inch cargo wrench
What other equipment is needed for normal operation of the tire, read the article tire fitting equipment
