It's a three step process to get everything adjusted.
-- With the wheel off the bike standing upright, hold the sprocket in your right hand (drive side) using a rag to stay clean, and the reaction arm in your left hand. Hold the sprocket steady, not letting it turn, and with the left hand, either turn the reaction arm in to tighten, (clockwise) or out to loosen, (counter-clockwise). This effectively sets the kickback or baseline distance of the brake pads to the roller drum (hub). If you turn the reaction arm all the way in, when you try turning the sprocket backwards, there is no movement. The brakes are "locked up" at that point. If you turn the reaction arm outward, now you start to feel play in the sprocket (with the wheel not turning), as the spacing between pads and hub increase. Turn the reaction arm arm out to the desired setting. (For me it's 1/4 rotation allowed on the sprocket. It may not be 1 to 1 ratio of turns, reaction arm to sprocket so play around until you get a setting that works for you.)
-- When placing the wheel back into the drop outs, you don't want to change the relative position of reaction arm to hub. Slide the wheel into the dropouts with the reaction arm as close to it's final position, parallel to the chain stay, as best you can. (See step 3) Once in place, set chain tension by pulling the hub toward the rear of bike, put a bolt in the reaction arm to keep it from turning, and lightly snug down the axle nuts, without letting the hub turn.
-- When placing the chain on the sprocket, note the position of the pedals. If the sprocket is turned backward into the "braking position", then you'll want the pedals located in their "braking" position" also. Set the pedals where you want them, slip the chain onto the sprocket (in it's braking position), and then complete the addition of a screw to the reaction arm clip and fully tighten the axle nuts.
ich meinte 'n komplettes disc-hr mit disc-bremse.
) und werde wohl sicherheitshalber ne disc am VR montieren, nur für den fall.
es fehlen Kugeln. 
Also den Text 
