Fixed size dumbbells come in various sizes, shapes and weights. Their weight can't be changed, hence they are made from single piece of metal (heavier dumbbells) or plastic (lighter dumbbells), which makes them robust and durable.
If one needs dumbbells in several sizes, one must get several pairs of dumbbells. This requires space for storage and can be heavy and expensive – for example, set of 10-12 pairs of fixed size dumbbells can weigh up to or even more than 400-500 pounds. On the other hand, if more trainees workout at the same time, they can train with various dumbbells at the very same moment.
These are the reasons why fixed size dumbbells are common in commercial gyms.
If metal fixed size dumbbells are chosen, consider one with strong rubber coating. Such coating protects dumbbells and other equipment from damage, prevents rust and generally, looks good.
Dumbbells with manual weight change
Simple short bars and weight plates can be used to make dumbbells of various weights. Desired weight is simply accomplished by adding plates required for particular weight. Although small bars for dumbbells weigh only few pounds, don't forget their weight when calculating total mass of the dumbbells.
Changing weight requires time, but same weight plates can be used for other bars and exercises.
In order to secure plates, various mechanisms are used, mostly in the form of safety screw or a pin. Safety mechanism is very important, since it prevents plates from falling off the bar.
Serious lifters require lots of plates, starting from the smallest plates to standard large ones. In that case, buying a pair of small bars with right collar diameter and proper safety system is a smart investment - as long the time required for changing the weight is not a problem.
Adjustable dumbbells with dial-in mechanism
Modern adjustable dumbbells come with so-called dial-in mechanism – user selects desired weight and mechanism automatically sets required plates on the bar. These dumbbells are the most expensive one, per singe unit, but they require least space and weight change is very fast.
Adjustable dumbbells come in various shapes and sizes, but most popular ones, like Bowflex SelectTech 552 Adjustable Dumbbells, have weight range from 5 to 52.5 pounds (2.26 to 23.8 kg) with 15 different weight settings and weight difference of 2.5 pounds between individual weight settings. This way, a pair of adjustable dumbbells can replace 15 pairs of fixed size dumbbells, saving plenty of space and weighing much less.
Of course, there are many other adjustable dumbbells' models with different weight ranges, weight settings and weight increments.
Dumbbell stand for adjustable dumbbells with transport wheels is convenient way for storing dumbbells regardless if the dumbbells are used or not dumbbell stand doesn't require much space and can be stored away when dumbbells are not used.
Maintenance
Dumbbells should be kept clean and dry, regardless if they have recommended protective rubber coating or not. When returning dumbbells to the stand or on the floor, dumbbells should not be thrown away, since something can be damaged or somebody can be hurt.
Depending on the model, adjustable dumbbells require occasional lubrication of the dial-in mechanism.
Other than that, dumbbells are really low maintenance workout equipment that should be part of any home gym.
Source : articlesbase.com
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