---
product_id: 267964920
title: "sthus Black Spring Loaded Chain Tensioner For 49cc 66cc 80cc Engine Motorized Bike 2 Stroke Engine"
brand: "sthus"
price: "KD 12.81"
currency: KWD
in_stock: true
reviews_count: 5
category: "Sthus"
url: https://www.desertcart.com.kw/products/267964920-sthus-black-spring-loaded-chain-tensioner-for-49cc-66cc-80cc
store_origin: KW
region: Kuwait
---

# Adjustable chain tightness Spring-loaded precision tension Universal fit for 49cc-80cc engines sthus Black Spring Loaded Chain Tensioner For 49cc 66cc 80cc Engine Motorized Bike 2 Stroke Engine

**Brand:** sthus
**Price:** KD 12.81
**Availability:** ✅ In Stock

## Summary

> ⚡ Keep your ride tight, smooth, and unstoppable!

## Quick Answers

- **What is this?** sthus Black Spring Loaded Chain Tensioner For 49cc 66cc 80cc Engine Motorized Bike 2 Stroke Engine by sthus
- **How much does it cost?** KD 12.81 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.kw](https://www.desertcart.com.kw/products/267964920-sthus-black-spring-loaded-chain-tensioner-for-49cc-66cc-80cc)

## 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

- • **Durability Booster:** Protects nylon tension wheel and extends lifespan of your motorized bike parts.
- • **Vibration-Free Riding:** Reduces vibration and wear, transforming every ride into a smooth, enjoyable experience.
- • **Universal Compatibility:** Fits 49cc, 66cc, and 80cc 2-stroke engine motorized bikes with versatile mounting options.
- • **Effortless Chain Stability:** Spring-loaded design eliminates chain popping and snapping for a seamless ride.
- • **Customizable Tension Control:** Adjust tension easily to your preferred tightness, ensuring optimal performance.

## Overview

The sthus Black Spring Loaded Chain Tensioner is a robust metal component designed for 49cc to 80cc 2-stroke motorized bikes. Featuring a spring-loaded mechanism, it maintains optimal chain tension to prevent popping and snapping, reduces vibration, and extends the lifespan of your bike’s drivetrain parts. Easy to adjust and universally compatible, it ensures a smoother, more reliable ride every time.

## Description

Description:Chain Tensioner Spring Loaded For 49cc 66cc 80cc Engine Motorized BikePackage Include: 1 x Chain Tensioner KitSpring loaded chain tensioner that keeps chain from popping and snapping. Can be used for all chain drive applications including center mount and rear mount chain drive for gas motorized bicycle plan kits. Must be mounted so that it pulls on the chain so the spring action will work effectively keeping the chain tight, but not too tight.Spring loaded installation positions on bicycle so the spring pulls on the chain. Can also be placed on the lower chain. The amount of tension can be adjusted to your liking. Remove vibration and snapping and popping of the chain during operation. It also keeps the nylon tension wheel from wearing out.This makes for a smoother, more enjoyable ride without vibration and increases the lifespan of not only the chain, but motorized bicycle parts. Makes the whole bike, motor and everything else last longer, because you aren't shaking it excessively. It really makes the difference between enjoying your ride and being glad that it was over.

Review: Si llego y enbuenas condiciones aunque no en el tiempo acordado
Review: I struggled with many chain tensioners thinking ok i got it this time...? Dont kid yourself.. spring-loaded tensioners are the best solution for sure! The one thing I needed to do.. I grinded the bolt heads down about half.. so crank peddle can pass freely.. Use double nuts on the bolt harnessing flex part, to lock tight but still loose enough for tensioner to flex.. Thats it.. Works great!

## Features

- For Chain Tensioner Spring Loaded For 49cc 66cc 80cc Engine Motorized Bike
- Package Include: 1 x Chain Tensioner Kit
- 80cc bike chain tensioner
- motorized bike chain tensioner
- International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07NXX4PV4 |
| Batteries included? | No |
| Brand | sthus |
| Color | black |
| Customer Reviews | 4.1 4.1 out of 5 stars (2,383) |
| Date First Available | 20 Feb. 2019 |
| Item model number | AMWZ_MZ0052-1 |
| Manufacturer | sthus |
| Material type | Metal |
| Number of items | 1 |
| Package Dimensions | 11.2 x 9.91 x 5.21 cm; 300 g |

## Product Details

- **Brand:** sthus
- **Item length:** 45 Inches
- **Load capacity:** 2.5E+2 bis 500 N
- **Material:** Metal
- **Recommended uses for product:** Maintaining proper chain tension in motorized bikes with 49cc, 66cc, and 80cc engines

## Images

![sthus Black Spring Loaded Chain Tensioner For 49cc 66cc 80cc Engine Motorized Bike 2 Stroke Engine - Image 1](https://m.media-amazon.com/images/I/51WSj4L46bL.jpg)
![sthus Black Spring Loaded Chain Tensioner For 49cc 66cc 80cc Engine Motorized Bike 2 Stroke Engine - Image 2](https://m.media-amazon.com/images/I/51fkiEB20mL.jpg)
![sthus Black Spring Loaded Chain Tensioner For 49cc 66cc 80cc Engine Motorized Bike 2 Stroke Engine - Image 3](https://m.media-amazon.com/images/I/6157rD6+sIL.jpg)
![sthus Black Spring Loaded Chain Tensioner For 49cc 66cc 80cc Engine Motorized Bike 2 Stroke Engine - Image 4](https://m.media-amazon.com/images/I/616OeX7TnCL.jpg)
![sthus Black Spring Loaded Chain Tensioner For 49cc 66cc 80cc Engine Motorized Bike 2 Stroke Engine - Image 5](https://m.media-amazon.com/images/I/71OdSoxvxIL.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

### ⭐⭐⭐⭐⭐ Review
*by G***. on 12 January 2026*

Si llego y enbuenas condiciones aunque no en el tiempo acordado

### ⭐⭐⭐⭐⭐ Review
*by W***M on 22 September 2023*

I struggled with many chain tensioners thinking ok i got it this time...? Dont kid yourself.. spring-loaded tensioners are the best solution for sure! The one thing I needed to do.. I grinded the bolt heads down about half.. so crank peddle can pass freely.. Use double nuts on the bolt harnessing flex part, to lock tight but still loose enough for tensioner to flex.. Thats it.. Works great!

### ⭐⭐⭐⭐⭐ Review
*by K***S on 6 May 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

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**Shop now:** [https://www.desertcart.com.kw/products/267964920-sthus-black-spring-loaded-chain-tensioner-for-49cc-66cc-80cc](https://www.desertcart.com.kw/products/267964920-sthus-black-spring-loaded-chain-tensioner-for-49cc-66cc-80cc)

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*Product available on Desertcart Kuwait*
*Store origin: KW*
*Last updated: 2026-01-24*