It's not a 'chain tug', it's a mini gear lever. No-one wants to spoil the clean lines of the fiximile bike, so the gear lever goes on the end of the trackend/horizontal dropout. You just reach down and back, and choose either of the 3 settings:
-horizontal: basic mode.
up: engages the intermediate teeth that are housed inside your fixed sprocket. They force their way out between the teeth you use in your sprocket's basic mode, thereby creating an easy climbing gear.
down: causes all teeth to retract, leaving a small gully on your sprocket in which the chain can spin freely, allowing you to coast.
It's not a 'chain tug', it's a mini gear lever. No-one wants to spoil the clean lines of the fiximile bike, so the gear lever goes on the end of the trackend/horizontal dropout. You just reach down and back, and choose either of the 3 settings:
-horizontal: basic mode.
up: engages the intermediate teeth that are housed inside your fixed sprocket. They force their way out between the teeth you use in your sprocket's basic mode, thereby creating an easy climbing gear.
down: causes all teeth to retract, leaving a small gully on your sprocket in which the chain can spin freely, allowing you to coast.