Lightened rim for a bicycle wheel and method for manufacturing such a rim

Abstract

The rim has a lower bridge (2) and side walls with spoke attachment zones (9) having a predetermined thickness. Infra-spoke zones (8) are placed between the spoke attachment zones. The increase in thickness between an infra-spoke zone (8) and the adjacent spoke attachment zone (9) or the decrease in thickness between the zone (9) and the zone (8) has a very sharp progression and a sharp corner (14, 11). Independent claims are also included for the following: (a) a bicycle wheel comprising a rim (b) a method for forming zones of reduced thickness in the lower bridge or in the side walls of a rim of a bicycle wheel.

Description

technical field

[0001] The invention relates to a lightened rim for a bicycle wheel and a method of manufacturing the rim. Background technique

[0002] As is well known, bicycle wheels are formed from a peripheral rim or rim, a central hub and a plurality of spokes connecting the hub to the rim.

[0003] The rim generally consists of two side walls connected or joined at one end by a circumferential inner wall or lower bridge and at an intermediate point by a circumferential outer wall or upper bridge to form a substantially Upturned A-section. The circumferential outer part of the side wall is usually provided with an outer edge forming a channel for the attachment of the tire, whereas the circumferential inner part of the side wall forms, together with the lower and upper bridges, a chamber for the attachment of the spokes.

[0004] On the lower bridge, or inner wall, there are seats that serve as connections for the spokes. These seats usually consist of holes or eith...

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