Shimano Dura-Ace R9100 Hollowtech II - Italian Bottom Bracket

Shimano Dura-Ace R9100 Hollowtech II - Italian Bottom Bracket Shimano

Shimano Dura-Ace R9100 Hollowtech II - Italian Bottom Bracket

Shimano Dura-Ace R9100 Hollowtech II - Italian Bottom Bracket

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Which Frames Need the Shimano Dura-Ace R9100 Italian Bottom Bracket?

The Shimano Dura-Ace R9100 Italian-threaded bottom bracket brings the flagship BB-R9100's advanced seal construction and small ball bearings to Italian 70mm threaded frames -- the threading standard found on many classic steel, titanium, and some carbon road frames from Italian and European manufacturers. Built on the Hollowtech II outboard bearing platform, it delivers the same smoother rotation and drivetrain efficiency as the English version, with the left and right cups both using right-hand threading per the Italian standard rather than the left-hand drive side thread of English BSA bottom brackets.

Italian threaded 70mm shell. Compatible with Shimano Dura-Ace R9100 and R9200 cranksets using the 24mm Hollowtech II axle, and mechanically compatible with all other Shimano road Hollowtech II cranksets on Italian 70mm threaded frames. Installation requires a Shimano TL-FC36 or equivalent Hollowtech II BB wrench -- note that Italian threading requires both cups to be threaded in (right-hand thread on both sides), different from English which has a left-hand thread on the drive side. For Dura-Ace riders with Italian-threaded frames, this is the correct OEM choice.

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Specifications

  • Model: BB-R9100 (Italian)
  • Series: Shimano Dura-Ace R9100
  • Interface: Hollowtech II (24mm axle), threaded
  • Shell: Italian threaded, 70mm
  • Bearing Type: Outboard sealed, advanced seal construction with small ball bearings
  • Compatible Cranks: Shimano Dura-Ace R9100, R9200 and all road Hollowtech II cranksets on Italian 70mm threaded frames
  • Installation Tool: Shimano TL-FC36 or equivalent Hollowtech II BB wrench

FAQ

What frames use Italian-threaded bottom brackets?

Italian threading (also called IT or ITA) is a 36mm diameter x 24 TPI standard with right-hand threads on both sides. It is common on Italian road bikes from Colnago, De Rosa, Pinarello, and Bianchi, and on many custom steel and titanium frames. Check your frame documentation to confirm the threading standard before ordering.

Is Italian threading more prone to loosening than English?

Italian threading has both cups in right-hand thread, which means the pedaling forces on the non-drive side tend to tighten the drive-side cup and loosen the non-drive side. Proper torque and periodic checks are important, and some riders use thread-locking compound on the non-drive side cup.

Can this be used with Ultegra or GRX cranksets on my Italian-threaded frame?

Yes. All Shimano road Hollowtech II cranksets use the same 24mm axle, so the Dura-Ace Italian BB is compatible with Ultegra, 105, GRX, and Dura-Ace cranksets on Italian 70mm threaded frames.

Best For

Road cyclists with Italian 70mm threaded frames -- particularly Italian-branded steel, titanium, or carbon builds -- running Shimano Dura-Ace or compatible Hollowtech II cranksets who need the correct OEM Italian-threaded bottom bracket.

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