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High strength: the main body of the bicycle derailleur is forged from aluminium alloy to achieve a light weight and high strength. The surface layer is painted with a rust protection treatment, which is more durable. 30.8/31.8 mm clamping ring: Mountain bike derailleur with a 30.8/31.8 mm conversion clamping ring that supports a tube diameter of 30.8/31.8/34.9 mm, most mountain bikes can be used and must be used according to the actual situation of the bike. Labor saving and faster driving: the shift cable pulls the chain guide to move the chain, so that the chain runs on different gears of the chainring, and realizes the gear ratio of different speeds, making driving more labour-saving H/L adjustment screws: H/L height adjustment screws, highly compatible two-way pull arm (both pull-up and pull-down wiring support, good compatibility), accurate and direct power transmission, fast and sensitive speed change. Carbon steel guide chain: the guide chain piece is made of carbon steel with hardened surface oxidation treatment, has a high rigidity, is wear-resistant, rust-proof and durable. › See more product details; Product description Specification: Item Type:Bicycle Derailleur Material: aluminum alloy body + carbon steel chain guide Product color:As picture show Product weight: approx. 165 g / 5.8 ounces. Applicable speed: 3 x 9/10 speed Mounting diameter: 30.8mm/1.2\; Product description Specification: Item Type:Bicycle Derailleur Material: aluminum alloy body + carbon steel chain guide Product color:As picture show Product weight: approx. 165 g / 5.8 ounces. Applicable speed: 3 x 9/10 speed Mounting diameter: 30.8mm/1.2\; Specification: Item Type:Bicycle Derailleur Material: aluminum alloy body + carbon steel chain guide Product color:As picture show Product weight: approx. 165 g / 5.8 ounces. Applicable speed: 3 x 9/10 speed Mounting diameter: 30.8mm/1.2\