Description Two 15mm chain tensioners with chain axle adjusters, suitable for 50cc to 125cc mini motorcycles, CRF50 ATVs, motocross bikes, etc. Two 15mm chain tensioners with chain axle adjusters, suitable for 50cc to 125cc mini motorcycles, CRF50 ATVs, motocross bikes, etc. Two 15mm chain tensioners with chain axle adjusters, suitable for 50cc to 125cc mini motorcycles, CRF50 ATVs, motocross bikes, etc. Applicable models: Chain tensioners can replace Baja mini motorcycles MB165 and MB200; can replace Falcon 200 mini motorcycles; can replace TrailMaster MB200-1; replacement parts for Coleman CT200U and CT200U-EX; 2. Troubleshooting a chain that's too loose or too tight: A loose chain can cause shaking, chain jamming, or even the chain falling off while riding. An overly tight chain increases friction, accelerates wear on components, produces abnormal transmission noise, and can even lead to chain breakage. 3. Optimal Performance: A mini chain tensioner ensures the bicycle chain maintains proper tension, improving overall performance and efficiency for a smooth and stable riding experience. 4. Extended Lifespan: Maintaining the correct tension reduces unnecessary wear on the bicycle chain and sprockets, extending their lifespan and avoiding frequent replacements. 5. Easy Installation: The chain tensioner adjuster is designed for quick and easy installation, allowing you to easily adjust chain tension and keep your bike in optimal condition. Specifications: Product Type: Chain Tensioner Adjuster Material: Iron Applicable Models: Massimo MB200 Baja MB165 and MB200 (Heat, Mini Baja, Baja Warrior models) Hensim MB165 and MB200 (Heat, Mini Baja, Warrior models) Hensim Doodle Bug (Blitz, Dirt Bug, Racer models) Falcon 200 TrailMaster MB200-1 Coleman ct200u and ct200u-ex Motovox MBX10 and MBX11 Classic 105cc Classic 1000w MM-B80 80cc Z50R CRF50F CRF70F CRF80F CRF100F XR50R XR70R XR75 XR80R XR80 XR100 C70 CT70 XL75 XL100S XL80S NS50F Package List: 2 x 15mm chain tensioners 6 x mounting nuts