Surly Big Dummy Rail Collars Bags we recommend using TACX Dynamic

we recommend using TACX  Dynamic Assembly Compound with carbon fibre components

|Featuring our proven ergonomics and award-winning 1:1® Actuation

SRAM BLACKBOX  CERAMIC HYBRID BEARING PULLEYS XX1

which can be handy depending on terrain

Surly Big Dummy Rail Collars Bags we recommend using TACX DynamicSURLY BIG DUMMY RAIL COLLARS These tiny little pieces of hardware are designed to vastly improve the overall performance of your Surly Big Dummy. These simple clamps are designed to strengthen the interface between Surly Dummy Rails and the lower longtail frame. Cool huh? Please see the attached resource below for more info instructions.