There are two versions of this round seat post adaptor. The V1 (89g) is for the older version of Aerobuster 55 frames, without the cutaway. The V2 (98g) is compatible with both. To install the V2 more easily, press in the front part first, then slide the back end down. If you prefer the V1, please make a note on the order.
This is for the Aerobuster 55, as used on the Trentino and Espresso frames. It is not compatible with the Aerobuster Evo or Aerobuster 40 types.
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