A caliper may enable you to keep an eye on the wear of your wheels and make the best choice when it comes to turning them. In measuring their diameters, you can determine which wheels are the most worn. Most of the time, it is better to place the wheels the most worn in the middle in order to rebalance the diameters.
Warning: Don't forget to make a visual check of the inside and outside parts of your wheels, in addition to the diameters.
How exasperating is it to mount brand-new wheels and bearings and then realize that they stop turning after several seconds?
Most of the time, spacers are to blame, because they are probably too short. A caliper will help you sort out the uncountable number of varieties of spacers that you have accumulated throughout the years. Opt for the longest ones. If the rotation doesn't get better after the adjustment, try a little smaller.
According to your skating practice or the model of your skates, axles may have a diameter of 6, 7 or 8 mm. A caliper will enable you not to make a mistake before going to the skate shop. Most of the time, 6 and 7 mm diameters belong to aggressive skating, and 8 mm axles are everywhere in speed and fitness skating.
The lower the frame, the more stable the frame... And the less stress on your ankles. In order to compare several frames, a caliper is of obvious interest. It can also enable you to measure the width of the bridges, the thickness of the sides, the space between the axles...