mostek ns bikes direct mount 31 8mm ridehubThe NS Bikes Direct Mount 31. 8mm is a precision crafted dual crown fork stem designed for DH and FR racing. CNC machined from high quality 6061 T6 aluminum, it provides extreme stiffness while maintaining a low weight. The stem length can be adjusted to two positions 43mm or 50mm. Compatible with Rock Shox , Marzocchi , and Fox fork crowns. Product features: Compatible with handlebars with a diameter of 31. 8 mm Adjustable length: 43mm and 50mm