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🚲 自行车尺寸计算器（车架尺寸）Bike Size Calculator (Frame Size)
根据腿内侧长（裆高）计算公路车、山地车、城市/旅行车的推荐车架尺寸和座垫高度，儿童车按腿长推荐轮径；只知道身高时也可估算。Find your road, mountain and city/trekking bike frame size and saddle height from your inseam — or estimate it from height — with a wheel size for kids' bikes.
使用说明与常见问题How-to & FAQ
「自行车尺寸计算器（车架尺寸）」是什么？What is the Bike Size Calculator (Frame Size) tool?
根据腿内侧长（裆高）计算公路车、山地车、城市/旅行车的推荐车架尺寸和座垫高度，儿童车按腿长推荐轮径；只知道身高时也可估算。Find your road, mountain and city/trekking bike frame size and saddle height from your inseam — or estimate it from height — with a wheel size for kids' bikes.
如何使用「自行车尺寸计算器（车架尺寸）」？How do I use the Bike Size Calculator (Frame Size) tool?
在「自行车尺寸计算器（车架尺寸）」中，填写「单位」、「腿内侧长（裆高）」、「身高（不知道腿长时填，可选）」等参数，结果会随输入实时计算并显示在下方。In the Bike Size Calculator (Frame Size): Fill in "Unit", "Inseam", "Height (if inseam unknown, optional)"; results are recalculated instantly as you type.
车架尺寸怎么算？How is the frame size calculated?
常用经验公式（Ergon、BIKE24 等）：公路车 = 腿长(cm) × 0.665（cm），山地车 = 腿长(cm) × 0.226（英寸），城市/旅行车 = 腿长(cm) × 0.66（cm）。不同品牌的尺码表略有差异，最终以试骑和品牌尺码表为准。Common rules of thumb (Ergon, BIKE24): road = inseam (cm) × 0.665 in cm, mountain = inseam (cm) × 0.226 in inches, city/trekking = inseam (cm) × 0.66 in cm. Brands' charts differ a little, so test-ride and check the maker's chart.
腿内侧长怎么量？How do I measure my inseam?
赤脚背靠墙站立，把一本书的书脊向上顶到裆部，测量书脊上沿到地面的距离。Stand barefoot against a wall, pull a book spine-up firmly into your crotch, and measure from the top of the spine to the floor.
座垫高度公式？Saddle height formula?
LeMond 法：从中轴中心到座垫顶部 = 腿长 × 0.883，这是一个起点，可再按舒适度微调几毫米。The LeMond method: bottom-bracket centre to saddle top = inseam × 0.883 — a starting point to fine-tune by a few millimetres.
只知道身高怎么办？What if I only know my height?
只填身高时，腿长按身高 × 0.468 估算。这是一个经验比例（示例值），个体差异较大，最好实测。两项都填时，工具只用腿内侧长。With height only, the inseam is estimated as height × 0.468. This is a rule-of-thumb ratio (example value) and people vary, so measuring is better. If you fill in both, only the inseam is used.
「自行车尺寸计算器（车架尺寸）」免费吗？需要注册吗？Is the Bike Size Calculator (Frame Size) free? Do I need an account?
「自行车尺寸计算器（车架尺寸）」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Bike Size Calculator (Frame Size) is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.