Youth/X-Small: 18

Bar Clamping Diameter: 31

recessed compression bolt cutout and extensive cutouts inside and out to keep the overall weight down

it is not compatible with the 17mm internal of the latest design

Seven iDP M1 Race Helmet - Matt Black/Gloss Black Size:Large Youth/X-Small: 18The M1 provides full face protection and long lasting comfort thanks to its foam padded internal muzzle providing maximum protection, cushioning you from abrasions and impacts. To keep you ventilated the helmet comes with 17 vents that are spread across the entirety of the helmets structure. Each vent is covered in meshing which prevents debris from entering the interior of the helmet. The wide face opening makes it easy to fit any goggles and the