GAN 251 M Pro is clearly one of today’s best 2×2 speedcubes. GAN usually commits to reducing the weight of cubes and this is no exception. Especially the GAN 251 M Air version is very light, weighing in at just 50 grams. The cube feels light, airy and is very fast. The name 251 comes from the fact that it is a 2×2, (2) and that the sides measure 51 mm (51). It is 1 mm larger than the 2×2 cube standard (50 mm). This is somewhat unusual, as it has also become popular to make smaller cubes, for example the popular 49 mm GAN model GAN 249. Both sizes have become popular, so it’s a matter of taste. The cube is adjustable with a GES system with replaceable GES nuts which we usually see in GAN cubes. This allows you to adjust both the tension in the cube and the elasticity of the springs. The cube’s magnetic strength can be adjusted in three different positions: weak, medium and strong.
The cube comes with an adjustment tool, GES nuts, a screwdriver, a cube bag for storage, a storage box, instructions for adjusting the cube and finally a cube solving guide. GAN 251 M Air only comes with the adjustment tool and the cube solving guide.
GAN 251 M Air – If you don’t need the magnetic core, you can order this variant that has standard magnetization just like a regular 3×3. It is also the lightest version with its 50 grams.
GAN 251 M Pro – This is the standard version of the cube.
GAN 251 M Leap – This is basically GAN 251 M Pro with stronger magnets. The magnets in the core are larger and thus stronger in this version. Note that the magnetic force between the edge and corner pieces can still be adjusted in three positions, but here even the weakest position will be stronger than the strongest setting on the GAN 251 M Pro.
In the picture below you can see the GES nuts which contain springs in different strengths. The color of the nut indicates the strength of the spring. You can also see the small lever on the pieces that can be set to three different positions: +, o and –. Finally, you have the magnets in the core that are directed towards the corner pieces. Note that only Pro and Leap have these magnets and the adjustable magnet strength.