自行車的設計是針對人們的使用而來，一輛好的自行車除了車架本身結構優良以外，尚需考慮到與騎乘相關的身體各部位計測值，因此設計出一個適合人體騎姿且舒適的自行車便是自行車業者的首要目標；而自行車整體騎乘舒適佳評量與人因設計知識庫之建立，乃係為使自行車業者得以有合時宜且適切的設計參考模式，以為設計時人體及車架適當尺寸之依循準則。本研究採用電腦輔助設計系統（CAD）建立起參數式的自行車車架結構，然後依據騎乘相闋的身體各部位計測值，建立起自行車騎乘電腦模型，再依此資料庫配合自行車車架結構設計，利用系統已建立人因工程知識庫，分析出自行車騎乘的較佳舒適範圍值；包括較適座高、與騎乘狀態相關關節的較適彎曲範圍值等，期能利用系統提供之動態模擬騎乘模型，對發展中之自行車進行人因工程分析，以利設計師設計出最適合人體騎乘之自行車。

The design of a bicycle depends on the desire of users. An excellent bicycle does not only include a nice structure, but also takes the size of every part on bodies of riders into consideration. Therefore, the most important purpose for designer is that the bicycle should fit in to the rider's posture and comfortable feeling on the bicycle. To establish this evaluation application program on computer simulation model with bicycle riding comfort enable the producer to have preferable references for bicycle design. The research using CAD systems looks for the standard parameters of bicycle construction to set up a computer-simulated riding model. After creating a data bank of riders' physiological and psychological responses, one can analyze the parameters of the comfortable riding model with computer simulation, including seat height and height of handlebars. In addition to EMG results, riding comfort was assessed based on the regression curve of the riders' subjective sensations with respect to the seat height. This computer simulation model can be utilized by manufacturers and designers for setting up a standard of bicycle size. The computer simulation model established by this system will improve the development of ergonomic analysis of bicycles and help design more comfortable bicycle for riding.