Bicycle Rim With Segmented Bead Channels
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Solution Overview
Problem
Conventional tubeless bicycle rims face challenges in accommodating larger width tires due to variations in tire diameter and bead size, leading to difficulties in inflation and air leakage, especially with fat bikes that require wider rims and tires.
Innovation Solution
The design incorporates separate tapered bead channels for each tire bead, allowing for easier installation and inflation, with a single-wall construction that simplifies manufacturing and accommodates various tire sizes and shapes, including those with manufacturing tolerances and warping issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single center channel is used in the rim for tubeless tires, then the rim structure is simple, but it becomes difficult to inflate wider tires and air leakage occurs due to bead instability
Solution Approach 1:
The single center channel is divided into two separate bead channels, one for each tire bead. This segmentation allows each bead to be independently positioned and sealed against its respective bead seat, preventing air leakage and facilitating easier inflation of wider tires while maintaining a relatively simple overall rim structure.
2Reliability
If the rim is designed for tight bead seating to prevent air leakage, then air retention improves, but tire diameter variations from different manufacturers cause inflation problems
Solution Approach 1:
The bead channels are designed with tapered sides that provide a gradual transition zone, allowing the bead to be seated tightly at the bead seat for air retention while accommodating variations in tire diameter and bead size from different manufacturers. The local geometry varies along the channel length to balance sealing and adaptability.
3Adaptability or versatility
If wider rims are used for fat bikes, then larger width tires can be accommodated, but the area between beads increases making pressure establishment difficult
Solution Approach 1:
By dividing the center channel into two separate bead channels, each channel can be optimized for its respective bead, maintaining effective sealing and pressure establishment even in wider rims. This segmentation prevents the beads from interfering with each other while ensuring adequate pressure can be built in each sealed compartment.
4Reliability
If conventional tubeless rims are used, then tubeless operation is achieved, but pinch flats still occur and weight reduction is limited
Solution Approach 1:
The segmented bead channel design ensures that each bead is independently sealed against its bead seat, creating more reliable sealing that prevents pinch flats while maintaining the tubeless configuration that eliminates the tube weight, achieving both reliability and weight reduction.
Data Source
AI summary
Bicycle rims that allow tires to be more easily mounted in a tubeless configuration are disclosed. More specifically, a bicycle rim may control the two beads of the tire with separate bead channels for each bead and a center bridge extending between the two bead channels.