早上翻FSA官网的牙盘资料，看到BB30产品一大堆，不解，就翻了翻相关内容，小译一下，就当自己学习了。请指正。
Bb30标准确立了大尺寸五通车架的规范。新轴承系统使用封闭、内嵌式30mm铝制轴芯，去除了轴承外圈，使轴承更轻。大尺寸的五通管提供了更多空间加置更粗大的车架下舌、坐管和链条，以消减踏板动作产生的侧向偏移。
以下为fsa官网内容：
更轻：去除五通轴承外圈，使用铝制轴芯，牙盘、中轴可减重12%。
更窄：中轴内置于五通壳内，可适用轴距更窄的牙盘，增加两踝间距，使踩踏动作更加自然。
更硬（刚性）：新的EFBE测试确认，BB30中轴系统增加了牙盘整体硬度。
更坚（耐久度）：五通壳内径增加了23%（35mm-42mm），bb30中轴的体积较其他中轴系统更为巨大，加长了使用寿命，也使铝合金作为轴芯材料成为可能，减重可高达110G。新轴承改善了滚珠直径和轴芯的比率，带来更好的流畅性和耐久度。
总得来说BB30就是: 内射，无露出，新体位，更轻、更硬、更持久。
MEGAEXO （顺便把FSA应用很多的MEGAEXO技术说明也翻一下）
Fsa 钢轴双牙盘设计，钢轴与驱动侧（牙盘侧）曲柄连为一体，轴承外圈旋进车架五通，megaexo牙盘适用于山地车68、73、83mm英式螺纹五通管和公路车68、70mm意式五通管。
The BB30 International Standard provides the specifications for an oversized bottom bracket shell for a bike frame. This standard allows for Direct-fit, pressed-in bearings and a 30 mm spindle.
The system saves weight by accepting a 30mm aluminum spindle and eliminating cups that would normally hold the bearings.
The oversized bottom bracket of the frame provides more area to attach larger down tube, seat tube and chain stays to better resist deflection from pedaling forces.
MegaExoMegaExo bottom brackets featuring external bearingsRefers to FSA’s steel spindle, 2-piece crankset design. The steel spindle is integrated in to the drive-side arm. External bearing cups are threaded in to the frame’s bottom bracket shell. MegaExo cranksets are compatible with 68, 73, and 83 mm English threaded bottom brackets for mountain bike, and 68 mm English and 70 mm Italian bottom brackets for road bike.
BB30Oversized bottom bracket open standardBB30 is LIGHTER: By eliminating the BB cups and using an aluminum spindle, the weight of the crank and BB assembly can be reduced by up to 12%.
BB30 is NARROWER: With the bearings inside the BB shell, the crankset can be made narrower in this critical area, increasing ankle clearance.
BB30 is STIFFER: Confirmed by new EFBe testing, the BB30 design increases the stiffness of the crankset.
BB30 is MORE DURABLE: BB30 bearings are significantly larger than those used in other systems, resulting in longer bearing life. Increasing the inner diameter of the bottom bracket shell by 23% (from ~35mm to ~42mm) enables the use of aluminum alloy as spindle material, saving up to 110g. New bearing size shows a better ratio between race and balls diameter, improving smoothness and bearing life.
NEWS! ITALIAN EVENT: I CAMPIONI PEDALANO CON TE | TECH
MegaExoMegaExo bottom brackets featuring external bearingsRefers to FSA’s steel spindle, 2-piece crankset design. The steel spindle is integrated in to the drive-side arm. External bearing cups are threaded in to the frame’s bottom bracket shell. MegaExo cranksets are compatible with 68, 73, and 83 mm English threaded bottom brackets for mountain bike, and 68 mm English and 70 mm Italian bottom brackets for road bike.
New bearing size shows a better ratio between race and balls diameter, improving smoothness and bearing life.这一句是不是那么翻？对中轴内部结构完全不懂，大家给点意见
额……这货应该发新人区吧，版主请移~~~
[ 此帖被dreamnoodle在2011-06-03 12:09重新编辑 ]
