| Features | T3 Carbon: Carbon frames are generally manufactured as a "monocoque" structure. This means the entire frame, or significant parts anyway (front triangle, or rear triangle) are molded as a single piece. The bladders that are used to pressurize the frame during molding are difficult to control and may result in additional resin left inside the frame. While this can ensure good continuity of the carbon fibers through that part of the mold, all monocoque frames still require that frame parts be glued together. Marin employs this manufacturing technique where it makes sense, but in the road category, we primarily use T3 construction, also known as "tube to tube". In this technology, each frame tube is individually molded, which allows us to precisely control the wall thickness of each tube, resulting in ride tuning perfection. Then, each tube is laid into a fixture that positions them to precisely the angles required for that frame, where they are then bonded into place, and reinforced with an additional lay up of carbon, before going into the heating ovens. This extra care results in absolute minimum weight, perfected ride feel, and a bike that you won't want to climb off of.
4-In-1 Cable Guides: An interchangeable cable management system for 2014 carbon hardtail, cyclocross and road frames. Made from precision CNC’d aluminum, the guides allow for the use of both mechanical and electronic drivetrain systems through an internal routing layout that protects cables and wires. To fit the application and rider preference, the guides can be changed out for use of full-length housing, housing with cable stops, electronic or flush mount covers when a cable is not present.
Power Taper Seat Tube: Formed seat tube assemblies found on carbon Marin Endurance Fit & Pro Fit road bikes and Cyclocross bikes to maximize energy transfer and rider comfort. The structure features an oversized dimension at the bottom bracket junction and tapers to a smaller diameter along its length before connecting at the seatstay and top tube junction. The shaping increases frame strength and rigidity at the bottom bracket area to optimize energy transfer from pedaling efforts. The smaller dimension at the top of the tube allows for greater frame compliance at the seatpost/rider interface, in addition to using a smaller-diameter 27.2 seatpost.
RVS Seatstay: The Rapid Vibration Suppression system is our tuned seatstay forming process designed to reduce shock transmission between the rider and rough road surfaces. Used on alloy and carbon road bikes, the stays are formed and arced with specially butted tubes to allow for the vertical deflection of impacts generated at the rear wheel. Carbon models feature an additional split-wishbone brake arch to increase surface area for shock dissipation and resist torsional flex from hard pedaling efforts and impacts while leaned over in a corner.
Tapered Head Tube: As bicycle forks evolved, the diameter of the "steerer tube" of a fork, and the "head tube" of the frame (which houses the steerer tube and headset) has steadily increased. Years ago, forks were fairly standard at a 1" steerer diameter. This increase to 1-1/8" (also known as OS) in the 90's, and even 1-1/4" and 1.5" sizes became somewhat common. In particular, 1.5" was used on Freeride or downhill frames due to the inherent increase in strength that comes from the larger diameter. But there were some problems, 1.5" forks required very large head tubes, and were heavy. As the sizes evolved, it was realized that using a tapered steerer tube would offer up the best of both worlds. Marin uses tapered forks that have a 1.5" lower diameter, but then taper to a 1-1/8" upper diameter. This reduces weight, but keeps very high strength where it's needed, at the base of the steerer tube, where it meets the fork crown. This type of tapered fork greatly increases stiffness and strength, while keeping weight to an absolute minimum. Unlike many other companies, if a Marin bike has a tapered head tube, it also has a tapered fork, to take maximum advantage of the technology.
Endurance Fit Geometry: Marin’s endurance road geometry, which combines a more neutral riding position with performance-oriented dimensions. This encompasses small changes in the frame, like a longer wheelbase, more stable steering angle and slightly taller head tube. Together these details unite to deliver a ride quality that is fast and responsive while isolating the rider from excessive fatigue. Additional frame features include fork and frame dimensions for fitment of larger-volume 25c tires and our Power Taper seat tube featured on carbon models that utilizes an oversized dimension at the bottom bracket area to maximize rigidity before gradually tapering to use a smaller-diameter seatpost for optimal rider comfort. Carbon and alloy frames feature our RVS(Rapid Vibration Suppression) system, which are radially-arced and formed seat stays that reduce the transmission of bumps from rough roads.
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