If you live in a climate that sees snow in the winter, chances are you want both summer and winter tires for your car (though all-season tires are much better now and less of a compromise than they used to be). Ideally these would come on different sets of wheels. This is a bit pricey when buying new wheels, but a second-hand set for a common car can usually be had at decent prices. My E39 came with summer tires on the correct style 50 wheels, and winter tires on style 48 wheels – which meant that I could do the switch myself. Hence I acquired the necessary tools. You want at least the following:
- A good hydraulic jack. Buy the best you can afford. The lightweight €30 ones you see at Aldi and Lidl are crap. Mine is an extra-low two-piston design that should also fit under lowered cars and raises the car very quickly. Maximum weight is limited to two tons, but I don’t like SUVs so it doesn’t matter. It still weighs 30kg, which I take as a sign of quality, and cost €120.
- A 1/2″ breaker bar, for loosening the bolts – get the longest you can get, mine’s 60cm.
- A 1/2″ torque wrench that covers the required torque range (around 120Nm).
- The properly sized socket (17mm for my car).
- Some acid-free grease to lube the centering ring, not the hub itself.
- A wire brush to clean the hub, which will make it easier to get the wheels off half a year from now.
- Ideally, a cordless impact wrench. But the good ones are expensive, the cheap ones are a waste of money. I instead got an adapter from hex to 1/2″ to use with my cordless impact driver, which has enough power to unscrew the bolts after they have been loosened with the breaker bar, and tightens them just enough to fully tighten them with the torque wrench.
If you take the proper safety precautions, such as telling them where they are allowed to stand and what they are allowed to touch, changing wheels is a great way to get the kids involved. Here’s my three-year-old son trying to jack up the car (now that he’s five years old, he finally has the strength to do it):
And my daughter removing the bolts. Be sure to hold the wheel in place when the final bolt is removed.
If your kids know how to write, let them mark the tires with the position on the car. They can also help with cleaning the wheels before they are put into storage. Don’t forget to check the tire pressure, and re-tighten the bolts with the torque wrench after 50km to 100km of driving.