The helion the rebirth of xc before world cups and when cross country wasnrsquot about the recovery drinks and the nerdy gear it was about the pure simple joy of riding in the mountains shimano xt drivetrain the shimano drivetrain is the perfect combination of performance and durability with the xt shadow plus rear derailleur to enhance gear indexing and to reduce chain slap the raceface aeffect chainset with its cnc machined arms help to reduce weight but maintain the strength these bo