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Spring construction: This chain tensioner can transform multi-gear wheels into input wheels. The spring construction fits different gear sizes and prevents the chain from slipping out of the crank. [[For 11T / 13T derailleur]] Ensures perfect tension of your chain so you can pedal with less effort. Suitable for folding bikes with 11T or 13T rear derailleur. Lightweight and mini, easy to install and use. [[[Single Speed Adjuster]] The spring adjustment, which ensures perfect chain tension, converts the multi speed bike into a floating pulley at a single speed and ensures perfect chain tension with the spring adjustment. [[Light]] Made of high-quality aluminium alloy material, the light weight does not burden the bike. [[[Service Guarantee]]] If you have any questions about our products, please send us an email. We will get back to you within 24 hours to solve the problem for you. › See more product details