Zipp service course 80 bars affordable bars but with the fit and durability of pro level bars a neutral wrist position on the drops is provided and the 4 degree outward angle also helps reduce the strain on the wrists provides the same angles and dimensions as the service course sl 80 80mm horizontal reach between the stem clamp and the centre of the brake perch 125mm drop from the stem clamp to the bottom of the drops constructed from 6061 aluminium weight 300g 42cm 318mm bar diameter