| 摘要 |
A bicycle sprocket is provided with a sprocket body and a chain engagement structure. The chain engagement structure includes sprocket teeth defining chain rollers receiving troughs. At least two consecutive ones of the troughs include a driven-side surface and a non-driven-side surface. The driven-side surfaces each have a first chain roller contact points corresponding to a first radius of a first minimum contact circle when one of the chain rollers is positioned to fittingly contact the driven-side surface. The non-driven-side surfaces each have a second chain roller contact points disposed at a second position corresponding to a second radius of a second minimum contact circle when one of the chain rollers is positioned to fittingly contact the non-driven-side surface. The first radius is larger than the second radius. The driven-side surfaces have effective concavities that are equal to or less than the curvatures of the chain rollers. |
