Size Chart Selling Point *Mountain Bike Bicycle Chain Guide Protector Chain Stabilizer Aluminum Alloy*34.9 medium tube, coming with two reduction sleeves, which can convert 34.9 to 28.6 or 31.8 diameter to fit 28.6 or 31.8 diameter middle tube *Most of the fixed gear bike frames are 28.6, most road hike frames are 31.8 or 34.9, mountain bike frames are mostly 34.9*Used on the medium tube of the bike frame, can effectively prevent chain falling and jumpingSpecifications:*Material: Aluminum alloy POM*Optional color: Red, Black (As Pictures Show)*Size: 68.4*68.6*57.2mm (Approx)*Net weight: 97.4g (Approx)*Gross weight: 110g (Approx)*Packing size: 100*100*30mm (Approx）Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the dataPackage Contents:1* Chain guide2* Wrenches2* Reduction sleeve Showcase Multiple Colors Available
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