ENVE Composites G Series Gravel Handlebar - Carbon 31.8mm 42cm BlackENVE Composites G Series Gravel Handlebar Carbon 31. 8mm 42cm Black. Whether its descending the steep and technical grades at the Crusher in the Tushar finding more comfortable hand positions during the 200 mile slog across Kansas at the Dirty Kanza or adventure riding in your own backyard this full carbon handlebar provides performance driven gravel riders with the options comfort and control they need to grind gravel with confidence. Ergonomically