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 PLASTIC BICYCLE RIM Post Reply Forum

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 Re: PLASTIC BICYCLE RIM Re: PLASTIC BICYCLE RIM -- pythagoras Post Reply Top of thread Forum
 Posted by: manulal ® 01/13/2005, 02:22:46 Author Profile Mail author Edit Hi, first of all the load of a bicycle is not supported by the air inside the tyre but by the tyre walls, the rim, the spokes at the top(not at the bottom), and the hub. when you load a bicycle wheel the load is supported by the vertical spokes at the top and the deformation of rim is prevented by the horizontal spokes. The vertical spokes at the bottom are freee of any load, practically. If these informations are useful please contact me and i shall send a detailed mail. Manu.

 Re: PLASTIC BICYCLE RIM Re: PLASTIC BICYCLE RIM -- pythagoras Post Reply Top of thread Forum
 Posted by: zekeman0 ® 01/06/2005, 11:40:18 Author Profile Mail author Edit Repost I would treat the force of bike plus rider as a point force acting on the rim and rotating. The tire pressure is constant around the rim and as a first approximation, it would be equal to the initial pressure. The design would therefore involve the hoop pressure around  the rim and the rotating  point  force and the forces in the supporting spokes. The spoke forces may be fun. If  you want to get the pressure more accurately, it becomes a geometric problem of  putting a flat, A on the toroidal section and getting its volumetric change,V1-V2 ,applying the gas laws and writing W=p2*A p2/p1=V1/V2   Good luck