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Code: SMBB4600B
Shimano Tiagra 4600 Bottom Bracket.
  • Outboard Bottom bracket bearing cups for use with Tiagra FC4600, FC4603 and Compact FC4650 2-piece cap-free design chainsets
  • Minimal bearing interface gives superbly smooth rolling
  • Required for installation of FC4600, FC4603and FC4650 chainset


paul Good workhorse of a bottom bracket.
Stuart Best price around, always handy to have as a spare, easy to fit
Mr De Baene Works like a charm! Excellent and superfast service!
B P Trusty and awesome performance as ever from the Tiagra range. Ordered as part of the yearly bike freshen up! Great service from Merlin too.
Mr Millar Great value BB, I don't feel my legs struggle to turn the cranks any more than a ceramic one for instance.
Daddicool With the required tooling and lubes this is an easy fit for a home mechanic of modest skills. Shimano 105 and Ultegra units aren't materially different or lighter and harder to get hold of now anyway in this form (the updated version compatible with 11 speed drivetrains have a revised smaller diameter outer shell requiring a different tool or adaptor for earlier tooling). This replacement cured my clicking crankset as I hoped it would for very little cost. Prompt delivery was very welcomed from Merlin.
Mr Browning Easy to fit. Smooth and quiet. Great price!
Mr Clifford This will last 3000 miles, why spend more!
Mr Harper Much smoother than my standard BB and there is a lot less flex with the bearings being so much further out. Also seems to assist with power transfer as my average speed has already increased. Highly recommend.
Mr Phillips I needed one of these with Italian threads, easy to fit providing you have the installation tools. Works really with the my Sora triple chainset. A good buy.
Mr Trude Great design. Used these before, easy to install