7/18/2023 0 Comments 3d slash crackThe overall wheelbase of most bikes shrinks dramatically as the front and rear suspension compress together, as the axle path of the fork is highly rearward and the axle path of the rear is usually slightly forwards. This means the ratio of rear-center to wheelbase increases throughout the travel, meaning more of the weight from your feet is loaded onto the front tire, helping it to grip. That makes it one of the longest rear-centers of any mountain bike. Forbidden can claim to have genuinely proportionate sizing, because the ratio of the rear-center length to the wheelbase (which defines the weight distribution between the wheels) is 35% for all frame sizes.īut because of the high pivot, the rear-center gets longer as the suspension compresses: the XL has a 464mm chainstay at 0% travel, but this grows to around 480mm at sag and 495mm at bottom out. While many bikes have the same chainstay length in all sizes, and some brands change the rear-center by a few millimetres across the size range, the Dreadnought sees a whopping 40mm difference in rear-center between a small and an XL. It also allows access to the internal cable routing for the dropper post. There's a little more storage space under the downtube with a two-bolt plastic cover which hides a space big enough for a tube or smuggled snacks. There's plenty of room for a full-size water bottle, plus there's an accessory mount on the top tube for an inner tube, tool or whatever else. But given the relatively short rear travel, I'm not convinced you need to. A 190mm-travel dual crown fork has a similar axle to crown measurement to the 170mm stock fork, so it's not an issue if you want to go there. The frame is tested to downhill standards and is dual-crown compatible. And thanks to the idler pulley, Forbidden can change the positioning of the main pivot relative to the BB without affecting the suspension kinematics. To create the change in rear-center length, the main pivot moves back relative to the BB as the frame size increases, so all the change happens in the mainframe, which needs to change anyway. One of Forbidden's most interesting features is that the chainstay length is different for each frame size, but to save on expensive carbon molds, Forbidden use the same swingarm for all four sizes. The single pivot design means there's only two main frame members: the mainframe and swingarm, both of which are made form carbon fiber.
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