专业自行车心率区间计算器，免费计算LTHR和功率区间，优化心率训练效果。支持多种训练强度设置、卡路里消耗计算，帮助骑行爱好者科学制定训练计划，提升运动表现。
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免费在线链条长度计算器，专业计算自行车所需链条长度。支持无参考链条情况下的精确计算，提供简单和严格公式两种计算模式，确保链条长度的完整性和精确性。
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