![]() Carbon fiber is a weave of carbon that is held together with a special glue. Carbon FiberĪ carbon frame is the lightest of the four materials and is also the strongest. The trade-off is that you feel a bit more vibration from the terrain. AluminumĪluminum frames are the most popular, they are both light and stiff, and are widely used across many bike styles. Canti Posts: Older cyclocross or mountain bikes, or new canti-specific frames might have posts on the rear seat stays and the fork for cantilever brakes, which are like V-brakes but with larger tire clearance and better braking modulation.Ī steel frame is sturdy and absorbs some vibrations when riding but is the heaviest of the three.These are the areas where you would mount disc brakes. Disc Tabs: Disc brake frames will have mounting posts on the non-drive side chain stay and on the non-drive side of the fork.Fender/Rack Braze Ons: Some frames will have mounting points on the fork and/or on the rear seat stays for mounting fenders or bike racks on.It allows the rear derailleur to connect to the frame and will shear off if the bike is put under major stress, instead of the chain stay breaking and ruining the bike. Derailleur Hanger: The derailleur hanger is a piece that connects to or is a part of the drive side chain stay.Drop Outs: Drop outs are the slots on the fork and the chain stays where the wheels fit into the frame.The longer the chain stays the more stable the bike will feel. The shorter the chain stays, the more responsive the bike will feel. Chain Stays: The chain stays connect the bottom bracket shell to the rear dropouts of the frame.The seat stays provide rigidity to the frame and some compliance for rougher roads/terrain. Seat Stays: The seat stays are two diagonal pieces of the frame that run down from the seat tube to the back of the frame. ![]() It houses the bottom bracket and crankset. The bottom bracket shell is the connecting point for the seat tube, down tube, and both chain stays. The seat post collar is a piece of metal, usually aluminum, which wraps around the outside of the top of the seat tube and torques down to hold the seat post in place. It holds the headset bearings that allow the steerer tube to move. The head tube is the tube at the front of the bike where the down tube and top tube intersect. The top tube is the highest piece of tubing on the frame that runs from the headtube near the stem to the top of the seat tube. The downtube is the largest piece of tubing on the frame it connects the headtube (where the handlebars sit) to the bottom bracket shell and seat-tube (near the crankset). The disadvantage is that although they do provide more reliable braking than standard v-brakes, they do not provide the modulation or braking power that hydraulic brakes do. The main advantage of mechanical disc brakes is less maintenance and easier adjustments. The main difference is that instead of a piston being activated by hydraulic fluid, the pads are controlled and actuated by a cable.
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