---
product_id: 125322900
title: "UAUS Adjustable Chain Tensioner W/Chain Guide CNC Silver Fit 415 Chain For 49cc 66cc 80cc Engine Motorized Bike Bicycle"
brand: "uaus"
price: "€ 33.66"
currency: EUR
in_stock: true
reviews_count: 8
url: https://www.desertcart.ie/products/125322900-uaus-adjustable-chain-tensioner-w-chain-guide-cnc-silver-fit
store_origin: IE
region: Ireland
---

# UAUS Adjustable Chain Tensioner W/Chain Guide CNC Silver Fit 415 Chain For 49cc 66cc 80cc Engine Motorized Bike Bicycle

**Brand:** uaus
**Price:** € 33.66
**Availability:** ✅ In Stock

## Quick Answers

- **What is this?** UAUS Adjustable Chain Tensioner W/Chain Guide CNC Silver Fit 415 Chain For 49cc 66cc 80cc Engine Motorized Bike Bicycle by uaus
- **How much does it cost?** € 33.66 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ie](https://www.desertcart.ie/products/125322900-uaus-adjustable-chain-tensioner-w-chain-guide-cnc-silver-fit)

## Best For

- uaus enthusiasts

## Why This Product

- Trusted uaus brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Description

UAUS Adjustable Chain Tensioner W/Chain Guide CNC Silver Fit 415 Chain For 49cc 66cc 80cc Engine Motorized Bike Bicycle

## Features

- CNC Chain Tensioner For 49cc 66cc 80cc Engine Motorized Bike
- Simple, clean design, and very effective. Improve your bike's reliability !
- Some frames (for example, some mountain bikes with three piece pedal cranks) don't have much room between the pedals and engine. Make sure you have at least 5/16" (8mm) of clearance. 3/8" (9.5mm) or more would be ideal.
- Package Include: 1 x CNC Tension wheel
- In order to facilitate transportation, the products are sent out in the form of parts. Please refer to the fifth picture for installation. If you have any questions, please feel free to contact us.
- ›See more product details

## Images

![UAUS Adjustable Chain Tensioner W/Chain Guide CNC Silver Fit 415 Chain For 49cc 66cc 80cc Engine Motorized Bike Bicycle - Image 1](https://images-na.ssl-images-amazon.com/images/I/61jYpnjCLeL.jpg)
![UAUS Adjustable Chain Tensioner W/Chain Guide CNC Silver Fit 415 Chain For 49cc 66cc 80cc Engine Motorized Bike Bicycle - Image 2](https://images-na.ssl-images-amazon.com/images/I/71MC73mEcML.jpg)
![UAUS Adjustable Chain Tensioner W/Chain Guide CNC Silver Fit 415 Chain For 49cc 66cc 80cc Engine Motorized Bike Bicycle - Image 3](https://images-na.ssl-images-amazon.com/images/I/71i1VmP0u-L.jpg)
![UAUS Adjustable Chain Tensioner W/Chain Guide CNC Silver Fit 415 Chain For 49cc 66cc 80cc Engine Motorized Bike Bicycle - Image 4](https://images-na.ssl-images-amazon.com/images/I/51qc60ty5PL.jpg)
![UAUS Adjustable Chain Tensioner W/Chain Guide CNC Silver Fit 415 Chain For 49cc 66cc 80cc Engine Motorized Bike Bicycle - Image 5](https://images-na.ssl-images-amazon.com/images/I/61kpXt-MfoL.jpg)

## Customer Reviews

### ⭐ 







  
  
    Don't buy this!! Just build your own.
  

*by J***B on Reviewed in the United States on September 1, 2019*

Package arrived on time with all parts and pieces. But does not come with bolts long enough to secure everything together. After tracking down the proper bolts, I spent an entire day messing with this thing trying to get it to work. So many problems I'm not going to list them all. But I will say if you use this you will not be able to use a master link in your chain .Unfortunately, this tensioner is complete and utter junk, and I will most definitely be sending it back. For $25 I was expecting a tensioner that was better than the crap one that came with the kit, alas I did not get one, this one may even be worse.Instead of buying a different one and hoping that it works, I ended up just building my own chain tensioner this afternoon. I made it out of some aluminum, u-bolts, and a roller skate wheel. I'll include a picture incase someone wants to use the same design. It's very simple and effective. The only part that is even slightly difficult is groving the wheel for the chain to sit in. ( I chucked it up in my lathe and turned a grove into the wheel, but I'm sure the same thing could be accomplished with a drill and file). Hope this helps any prospective buyers make a more informed decision, best of luck and God bless.

### ⭐⭐⭐ 







  
  
    Kinda incomplete.
  

*by J***N on Reviewed in the United States on June 7, 2019*

Seems like it may work well enough once I can actually install it. Nice of them to include that bearing, but the lack of instructions left me wondering what it was for quite a while. Plus, they didn't include bolts long enough for me to install it. Now I have to track some down. 😤

### ⭐⭐⭐ 







  
  
    Does not come with longer mount bolts needed or instructions.
  

*by M***. on Reviewed in the United States on August 1, 2020*

An adequate exploded view, and a written instruction are lacking.  The only fully assembled photo only shows the product from one side.  Pressing in the bearing was difficult.  If you are going to have an interference press fit that hard, either press the damn thing in yourself, or make it clear that an arbor press is necessary.  It was ALL my cast iron bench vise could do to get the bearing flush.  In spite of all that, it is an upgrade.  The design is good, the materials and fasteners used are good.  I believe there are flatness and thickness tolerance issues with the washers used and the plastic bushing thickness (which to be fair may be just to allow for material  removal to match sprocket alignment - no instructions to say so)

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*Product available on Desertcart Ireland*
*Store origin: IE*
*Last updated: 2026-03-04*