Booyah Medium Dog Pet Bike Trailer Pet Trailer and Stroller Red Comes with suspension and 12 inch air filled front wheel. Bike trailer components INCLUDED. Not an option purchase like competitors. OURS PULLS DIRECTLY CENTER BEHIND THE BIKE. Our competitor (Comfy) does not. Makes it difficult to pull on sidewalks when not directly center behind bike. Comes with stroller accessories (front 12 inch front SWIVEL, air filled wheel (NOT PLASTIC like competition). Plastic is not good with bumps and small pebbles. Bike hitch method and NOT clamp method which can bend frame and wear bike paint Size: Medium up to 60 lbs tow capacity but please see that your can fit within the interior dimensions. 40lbs dog seem to be the max size to fit. Instructions appear to be missing. Please look for instructions under the cushion.