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The PRO Gap Cap Exp + Di2 Battery Holder is an expander top cap and a SHIMANO Di2 battery holder designed to store the battery in the steerer tube.

HIGHLIGHTS

  • Expander top cap and a SHIMANO Di2 battery holder
  • Doubles as traditional top cap
  • Fits 1 1/8-inch steerer tubes
  • Available for all stems (PRHS0110) and the PRO Tharsis Di2 Stem (PRHS0111)