BCD是多大? ***************************** Model Number FC-5650 Series 105 Crank Construction HOLLOWTECH II Cassette Compatibility 10 speed Chain Compatibility Super Narrow HG for 10-speed Hyperdrive yes Dual SIS yes Reinforced Spider - Chainring Sets 50-34T Bolt Circle Diameter 110mm ***************************** Model Number FC-5600 Series 105 Crank Construction HOLLOWTECH II Cassette Compatibility 10-speed Chain Compatibility Super Narrow HG for 10-speed Hyperdrive yes Dual SIS yes Reinforced Spider - Chainring Sets 52-39/53-39/50-39T Bolt Circle Diameter 130mm ****************************** Model Number FC-5603 Series 105 Crank Construction HOLLOWTECH II Cassette Compatibility 10-speed Chain Compatibility Super Narrow HG for 10-speed Hyperdrive yes Dual SIS yes Reinforced Spider - Chainring Sets 50-39-30T Bolt Circle Diameter 130/74mm ************************************************ Model Number ST-R700 Series Non-Series Optical Gear Display No Cassette Compatibility 10-speed Front Shifting double/triple