I went to buy a rack for my commuter gravel bike. However, due to the lack of a mounting hole near the rear axle, my only option was one that’s secured to the seatpost.
This particular one is rated for 9kg, any more and the seatpost will probably snap. It also sways from left to right, also sub-optimal. Therefore I decided to design a reinforcement structure for it, using 3D printed parts and two 6mm carbon fiber tubes lying around. The printed parts are designed with aerodynamics in mind, and distributes the pressure on a large section of the bike frame. It added about 150g of extra weight, but now it can withstand myself (63kg) sitting on it without problem.
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I went to buy a rack for my commuter gravel bike. However, due to the lack of a mounting hole near the rear axle, my only option was one that’s secured to the seatpost.
This particular one is rated for 9kg, any more and the seatpost will probably snap. It also sways from left to right, also sub-optimal. Therefore I decided to design a reinforcement structure for it, using 3D printed parts and two 6mm carbon fiber tubes lying around. The printed parts are designed with aerodynamics in mind, and distributes the pressure on a large section of the bike frame. It added about 150g of extra weight, but now it can withstand myself (63kg) sitting on it without problem.