Shimano tiagra 10 speed groupset the tiagra groupset is a popular choice for riders who either want an easy gear to spin up hills or perhap are looking for a excellent performing groupset on a commute or winter bike tiagra has always offered excellent value for money and great performance and from looks alone is more in line with the 105 groupset above it it features the familiar 4 arm chainset that is now widely used across all of the shimano road groupsets as well as cable routing that is