Fouriers Single Chainring 110mm 38T 5 Bolt Red Narrow Wide Tooth Cycle Cross Bike Bicycle Full CNC made narrow-wide front chainring for Cyclocross 1x systems Narrow-wide teeth together with Fouriers snug fit wave design have extreme chain retention qualities Additionally each tooth has CNC cut holes for mud clearance Teardrop mud clearance technology reduces build up between chain and ring 110mm 5-bolt  38T