Built To Prevent Chain Drop On Tough And Muddy Routes,Easily Adjustable And Simple Chain Removal,Machined From 6061-t6 Aluminium,.CompatibilityDesigned To Fit On Any Bike With An Integral Braze-on Mount. If You Have A Round Seat Tube With No Braze-on Mount, You Can Buy A Braze-on Adapter.,Primed For 6mm-51mm Chain Lines And 34t-46t Round Or Oval Chainrings,Required A Minimum Distance Of 10mm Between Crank And Centre Of The Ring,Optimised For Use With Both Elliptical And Round Chainrings.,For 1x Use Only.