SRAM Direct Mount Dingle Spider? The manual approach to gear shifting is dingle-speed

2x 104 BCD cogs on either side to create dingle speed ratios

31T:20T and 33T:18T on the same frame

All the benefits of singlespeed but providing an extra gear for the following scenarios

Headwind

commuting gear

long distance gear optimisation

This Front DM Dingle Spider can also be used to fit the Gates 39T for Carbondrive Belts

This item can be polished to a high shine