---
product_id: 109142520
title: "sthus Spring Loaded Chain Tensioner for 49cc 66cc 80cc 2 Stroke Engine Motorized Bike- Adjustable Guide Wheel Black"
brand: "sthus"
price: "€ 24.90"
currency: EUR
in_stock: true
reviews_count: 8
url: https://www.desertcart.it/products/109142520-sthus-spring-loaded-chain-tensioner-for-49cc-66cc-80cc-2
store_origin: IT
region: Italy
---

# Durable corrosion-resistant metal build Fits 49cc-80cc 2-stroke engines Adjustable tension for perfect chain alignment sthus Spring Loaded Chain Tensioner for 49cc 66cc 80cc 2 Stroke Engine Motorized Bike- Adjustable Guide Wheel Black

**Brand:** sthus
**Price:** € 24.90
**Availability:** ✅ In Stock

## Summary

> ⚙️ Keep your chain tight, your ride smoother, and your style unstoppable!

## Quick Answers

- **What is this?** sthus Spring Loaded Chain Tensioner for 49cc 66cc 80cc 2 Stroke Engine Motorized Bike- Adjustable Guide Wheel Black by sthus
- **How much does it cost?** € 24.90 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.it](https://www.desertcart.it/products/109142520-sthus-spring-loaded-chain-tensioner-for-49cc-66cc-80cc-2)

## 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

- • **Built to Last:** Crafted from thickened, corrosion-resistant metal to withstand harsh conditions and extend chain life.
- • **Complete Kit Included:** Everything you need in one package—screws, nuts, and tensioner—ready to upgrade your bike instantly.
- • **Spring-Loaded Chain Control:** Maintains ideal chain tension to prevent derailment and sprocket wear—ride worry-free every time.
- • **Precision Fit for 2-Stroke Power:** Optimized for 49cc, 66cc, and 80cc motorized bikes to keep your ride smooth and reliable.
- • **Effortless Installation & Adjustment:** Wide mounting range and adjustable guide wheel make setup quick and customizable—no mechanic needed.

## Overview

The sthus Spring Loaded Chain Tensioner is a premium, adjustable guide wheel designed for 49cc to 80cc 2-stroke motorized bikes. Engineered with corrosion-resistant metal and a spring-loaded mechanism, it ensures optimal chain tension and alignment, preventing derailment and sprocket wear. Easy to install with included hardware, this durable tensioner extends chain life and enhances riding performance.

## Description

Full description not available

## 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 |
|---------------|-------|
| Manufacturer | sthus |
| Brand | sthus |
| Item Weight | 10.6 ounces |
| Package Dimensions | 4.41 x 3.9 x 2.05 inches |
| Item model number | AMWZ_MZ0052-1 |
| Manufacturer Part Number | AMWZ_MZ0052-1 |

## Product Details

- **Brand:** sthus
- **Material:** Alloy Steel
- **Recommended Uses For Product:** Ensuring proper chain tension in 49cc, 66cc, and 80cc motorized bikes
- **Strand Type:** Single

## Images

![sthus 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

### ⭐⭐⭐⭐⭐ Works great!
*by J***N on September 20, 2025*

Works so much better than the stock one I got with my engine kit. Get this for sure. It fixes tension immediately.

### ⭐⭐⭐⭐⭐ Tensions as should
*by K***S on May 6, 2025*

Good product I don’t have a 50cc bike I’m going to use the parts. And make a custom tensioner for my drift trike

### ⭐⭐⭐⭐ 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

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*Product available on Desertcart Italy*
*Store origin: IT*
*Last updated: 2026-03-07*