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Size: 68.4*68.6*57.2mm Package include:1pc Bike chain guide,2 Kinds of Reducing pieces Suitable frame specifications: 34.9MM / 31.8MM / 28.6MM Material: 7075 Aluminum alloy + Steel Weight: 97 grams Installation Steps: 1. Connect the chain stabilizer as shown in the figure 2. Install the chain stabilizer on the middle tube of the frame 3. Install as shown 4. The gap between the chain and the chain stabilizer is about 3mm 5. Make sure that the chain and the outside of the inner groove of the chain stabilizer are adjusted on the basis of the smallest flywheel and the distance between the chain and the outside of the chain is about 2mm. 6. Under the premise of ensuring the first two installation points, adjust the spacing and lock the screws.