Bicycle Steering Linkage With Offset Axis for Independent Rider Fit
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Solution Overview
Problem
Current mountain bike designs tie rider cockpit dimensions directly to vehicle performance attributes, limiting riders to specific performance characteristics based on their size, as wheelbase and stability are proportional to rider height, forcing shorter riders into less stable, more maneuverable bikes and taller riders into more stable but cumbersome bikes.
Innovation Solution
A steering linkage assembly that offsets the steering tube axis from the headtube axis, allowing independent adjustment of rider cockpit dimensions (reach and stack) without affecting wheelbase or fork rake, enabling riders to choose desired performance attributes regardless of their size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If rider cockpit dimensions are increased to fit taller riders, then rider fit is improved, but wheelbase increases resulting in more stable but less maneuverable bike performance
Solution Approach 1:
The invention divides the bicycle system into two independent adjustable segments: the rider cockpit (handlebar position, stem length) and the wheelbase (fork offset, head tube angle). This allows each segment to be optimized independently - the cockpit can be adjusted for rider fit while the wheelbase can be adjusted for desired maneuverability, breaking the traditional coupling between these parameters.
Solution Approach 2:
The invention introduces adjustable components that allow the wheelbase and cockpit dimensions to be dynamically changed based on rider preference and riding conditions. The fork offset can be adjusted to change wheelbase, and the stem length can be adjusted to change reach, enabling the bike to adapt between stable/long-wheelbase and maneuverable/short-wheelbase configurations.
2Stability of the object's composition
If wheelbase is increased to improve stability, then bike stability is improved, but rider cockpit dimensions must increase requiring taller rider fit
Solution Approach 1:
The invention separates the stability function (controlled by wheelbase and fork offset) from the rider fit function (controlled by cockpit dimensions). This allows stability to be optimized independently through fork offset adjustment without requiring changes to rider cockpit dimensions, enabling any rider size to access stable bike configurations.
Solution Approach 2:
The invention changes the traditional fixed parameters of bicycle geometry by introducing adjustable fork offset and stem length. These parameter changes allow the wheelbase to be independently varied to achieve desired stability levels without being constrained by rider size requirements, expanding the range of stable configurations available to riders of all sizes.
3Ease of manufacture
If traditional bicycle geometry is used where wheelbase is proportional to rider cockpit, then manufacturing simplicity is maintained, but performance attributes are tied to rider size limiting customization
Solution Approach 1:
The invention transforms fixed bicycle geometry into a dynamic system with adjustable parameters. The fork offset and stem length can be changed to create different wheelbase and cockpit configurations, allowing the same frame to be customized for different rider sizes and performance preferences while maintaining a relatively simple manufacturing process using standard adjustable components.
Data Source
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AI summary
A steering linkage assembly that allows an offset between a steering axis and a headtube axis of a bicycle. In turn, rider cockpit dimensions are divorced from vehicle performance aspects such that vehicle performance aspects may be tailored regardless of rider size. The steering linkage assembly generally includes linkage members on an opposite side of a linkage chassis than handlebars of the bicycle to improve performance by increasing steering angle range allowed by the linkage. In addition, different linkage members and linkage chasses may be provided to accommodate different offsets between the steering axis and the headtube axis.