--- product_id: 109142520 title: "Spring Loaded Chain Tensioner for 49cc 66cc 80cc 2 Stroke Engine Motorized Bike- Adjustable Guide Wheel Black" brand: "sthus" price: "B/.39" currency: PAB in_stock: true reviews_count: 13 category: "Sthus" url: https://www.desertcart.com.pa/products/109142520-spring-loaded-chain-tensioner-for-49cc-66cc-80cc-2-stroke store_origin: PA region: Panama --- # Durable corrosion-resistant alloy steel Fits 49cc-80cc 2-stroke engines Adjustable tension for perfect chain alignment Spring Loaded Chain Tensioner for 49cc 66cc 80cc 2 Stroke Engine Motorized Bike- Adjustable Guide Wheel Black **Brand:** sthus **Price:** B/.39 **Availability:** ✅ In Stock ## Summary > ⚙️ Keep your chain tight, your ride smoother, and your build envy-worthy! ## Quick Answers - **What is this?** Spring Loaded Chain Tensioner for 49cc 66cc 80cc 2 Stroke Engine Motorized Bike- Adjustable Guide Wheel Black by sthus - **How much does it cost?** B/.39 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.com.pa](https://www.desertcart.com.pa/products/109142520-spring-loaded-chain-tensioner-for-49cc-66cc-80cc-2-stroke) ## Best For - sthus enthusiasts ## Why This Product - Trusted sthus brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Precision Fit for Your Ride:** Engineered specifically for 49cc, 66cc, and 80cc 2-stroke motorized bikes to ensure seamless compatibility. - • **Protect Your Engine Investment:** Prevents costly damage to side covers and stator plates by keeping your chain perfectly aligned and tensioned. - • **Self-Adjusting Spring Loaded Design:** Maintains optimal chain tension automatically, preventing derailment and sprocket wear without constant tweaks. - • **Built to Last with Premium Alloy Steel:** Constructed from thickened, corrosion-resistant metal to withstand harsh conditions and extend chain life. - • **Effortless Installation & Customization:** Wide mounting hole range and adjustable guide wheel let you fine-tune tension with included hardware—no mechanic needed. ## Overview The sthus Spring Loaded Chain Tensioner is a robust, adjustable guide wheel designed for 49cc to 80cc 2-stroke motorized bikes. Made from corrosion-resistant alloy steel, it ensures precise chain tension and alignment, preventing derailment and sprocket wear. Easy to install with included hardware, it prolongs chain and engine component life by maintaining optimal tension automatically. ## Description Buy sthus Spring Loaded Chain Tensioner for 49cc 66cc 80cc 2 Stroke Engine Motorized Bike- Adjustable Guide Wheel Black: Chain & Sprocket Kits - desertcart.com ✓ FREE DELIVERY possible on eligible purchases Review: Good parts 100% - Works as it should excellent would buy again Review: Sthus bring loaded chain tensioner - Works great I use them on my gas bike motors on every build these things connect to the engine and keep the slack on the chain tight self-adjusting spring loaded I love it ## Features - Fitment:For 49cc, 66cc, and 80cc 2 Stroke Engine Motorized Bike - High quality：Chain roller tensioner ensures proper tension and alignment of the chain. It can prevent the chain from derailing, excessive wear of the sprocket and prolong the life of the chain. If the chain is not properly tensioned, it will be lost or broken. Eventually the side cover and stator plate will be damaged. - Premium Durability: Constructed with thickened metal and corrosion-resistant materials to prevent bending, wear, and chain derailment, ensuring long-lasting performance. - Easy Installation & Adjustment: Wide range of mounting holes and adjustable tension settings for a perfect fit on your bike. Includes all necessary screws, nuts. - Package Include: 1 x Chain Tensioner Kit ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07NXX4PV4 | | Brand | sthus | | Brand Name | sthus | | Customer Reviews | 4.1 out of 5 stars 2,561 Reviews | | Item Weight | 300 Grams | | Manufacturer | sthus | | Material | Alloy Steel | | Material Type | Alloy Steel | | Model | AMWZ_MZ0052-1 | | Number of Items | 1 | | Number of Packs | 1 | | Part Number | AMWZ_MZ0052-1 | | Recommended Uses For Product | Ensuring proper chain tension in 49cc, 66cc, and 80cc motorized bikes | | Strand Type | Single | | Unit Count | 1.0 Count | ## Product Details - **Brand:** sthus - **Material:** Alloy Steel - **Number of Items:** 1 - **Recommended Uses For Product:** Ensuring proper chain tension in 49cc, 66cc, and 80cc motorized bikes - **Strand Type:** Single ## Images ![Spring Loaded Chain Tensioner for 49cc 66cc 80cc 2 Stroke Engine Motorized Bike- Adjustable Guide Wheel Black - Image 1](https://m.media-amazon.com/images/I/616OeX7TnCL.jpg) ## Questions & Answers **Q: Will this work on a go cart?** A: Depending on the length of the chain an if it will mount to the 2 stroke engine **Q: Replacement wheels come in 8mm&10mm which size do i need for the black Sthus tensioner?** A: That's an odd question. The standard chain for a bike motor kit is #415 which is 7/16" wide or a little more than 11mm; neither of those sizes would work. If it is a replacement wheel then I would propose measuring the one you have to determine how big it is. If the wheel is actually a sprocket then 8mm would work with conventional #415 chain as the inner spacing between the outer bone links of the chain is 8mm. **Q: Can you use the stock chain guard, that comes with the motor, with this tensioner?** A: The stock chain guard and this tensioner can coexist on your bike without issue. **Q: Can these chain tensioners be used to tighten drive belts? I am converting to belt drive .** A: Yes, the pulley is 1" wide, so as long as the belt is not wider than an inch it will work. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Good parts 100% *by B***R on April 9, 2026* Works as it should excellent would buy again ### ⭐⭐⭐⭐⭐ Sthus bring loaded chain tensioner *by H***S on May 28, 2026* Works great I use them on my gas bike motors on every build these things connect to the engine and keep the slack on the chain tight self-adjusting spring loaded I love it ### ⭐⭐⭐⭐ Best bet for chain issues *by D***F on May 16, 2025* Excellent quality and fit, has kept my chain on for many miles. Only issue is bolt and nut that hold arm on loosens up. Needs a longer bolt so a lock washer can be installed. Do not overtighten the chain guide, it will not move and will cause issues with the bearings. Definitely worth the buy and far better quality than the closet door looking hardware that comes standard with the bike engines ## Frequently Bought Together - sthus Black Spring Loaded Chain Tensioner For 49cc 66cc 80cc Engine Motorized Bike 2 Stroke Engine - JRL 32mm-40mm Black Offset Intake Manifold and Gasket for 49cc 66cc 80cc Motorized Bike Motorised Bicycle (Black) - IMAYCC Bike Motor Kit 80cc Motorized Bike Kit 2 Stroke Bicycle Engine Kit with Wired Digital Computer Fit for 26-28" Bikes --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.com.pa/products/109142520-spring-loaded-chain-tensioner-for-49cc-66cc-80cc-2-stroke](https://www.desertcart.com.pa/products/109142520-spring-loaded-chain-tensioner-for-49cc-66cc-80cc-2-stroke) --- *Product available on Desertcart Panama* *Store origin: PA* *Last updated: 2026-06-23*