what is the thermal co-efficient of expansion of copper?
It is always a good idea to rebalance your tires when you rotate them. How many miles since the last rotation and balance? Even if you do not rotate them, it is still a good idea to have them rebalanced about every 10,000 miles anyway
Its a good idea to rebalance them when they're off the car, but its not necessary And yes, you are correct, every wheel will balance out differently and require a different amount of weight You'll know if you have one or more wheels out of balance if you have a vibration at high speeds
Yes the different weights are at the points indicated as being off balance by the balancing machine. And yes you should check your wheel balance at least when you rotate the tires. What better time to check tire condition, air pressure and balance then when you have them removed. It is possible to sling a weight off or have them slip from position during driving and braking not to mention road obstructions and pot holes.
Thermal Expansion Coefficient 17 x 10e-6/ °C
Coefficient of linear thermal expansion α For Copper 17*10-6/K at 20 °C (Thermal expansion (25?°C) : 16.5 ??m·m?1·K?1 ) (The linear thermal expansion coefficient relates the change in temperature to the change in a material's linear dimensions. It is the fractional change in length of a bar per degree of temperature change.)
