You will find a new geometry on the bicycle combined with the most up-to-date Shimano groupset made for novice racing in XC and MTB marathons. The Shimano Deore M 5120 is a 1x10 push with a very new rear derailleur mechanism. Radon in air is ubiquitous (existing or being everywhere https://encapsuladosvip.com/lever-4-0/