| 摘要 |
A bicycle crank assembly is basically provided with a crank axle, a first outer shell member, a second outer shell member, a first crank axle supporting member and a second crank axle supporting member. The crank axle has an end portion with an external mounting surface and an internal mounting surface. The first and second outer shell members are arranged relative to each other with a space being formed between the first and second outer shell members. The first crank axle supporting member is disposed on the first outer shell member and supports the external mounting surface of the crank axle. The second crank axle supporting member is disposed on the first outer shell member and supports the internal mounting surface of the crank axle.
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