1.FENDER SELECTION-Choosing the correct bolt-on fender is based on your wheel size and your tire width. This information can be found on the sidewall of your bicycle tire. Please be careful to choose a fender that is compatible with the size of your wheel and tire. If you have questions, please for help selecting the perfect fender. 2.COMPATIBILITY-A. Frame mounting eyelets are required to mount bolt-on fenders to the bicycle. If your frame does not have mounting eyelets, frame/fork mounting clamps can be purchased separately to create a substitution. B. Fender names include the profile width in mm. Profile width must fit through seat stays & fork legs. C. Rear sliding bridge clip is flip style & can be bolted to under side or front side of seat stay bridge. Seat stay bridge MUST have a hole to mount the sliding bridge clip 3.FENDER FEATURES-Fender profile lengths are: 20' front fender=500mm/rear fender=800mm; 24' front fender=600mm/rear fender=1000mm. Fender coverage can be extended by purchasing spoilers/mudflaps. 20' & 24' fenders feature 's ESC Safety Release System which allows the stays to uncouple should a branch or other debris get caught in the spokes. Rear Bluemels Basic fenders feature a cut-out on the front facing portion to allow for easier mounting & more adjustability near the bottom bracket. 4.INSTALLATION-Mounting bolt-on fenders requires some mechanical skill & will take about 2 hours to install. Installation will require tools such as a measuring tape, hacksaw to shorten stays, file, 7mm & 8mm wrench, and 4mm allen wrench. Fender Sets include: front fender, rear fender, U-stays with ESC release system, sliding bridge clip, necessary mounting hardware, and instruction manual. Contact for installation assistance.