Shimano 105 5800 groupset with 4iiii powermeter the shimano 105 groupset is the most asked for groupset when people are customising one of our award winning ribble bikes the groupset offers amazing value for money in an 11 speed package that may be a little heavier than ultegra but arguably offers a very similar performance 105 is shimanos first 11 speed groupset and offers big weight savings over the lower tiagra 10 speed offering the gear change is light yet positive just like in ultegra