---
product_id: 8757063
title: "SG-3C40 Nexus Sprocket (18T) | bike-cassettes-and-freewheels"
price: "$26.80"
currency: USD
in_stock: true
reviews_count: 8
url: https://www.desertcart.us/products/8757063-sg-3c40-nexus-sprocket-18t-bike-cassettes-and-freewheels
store_origin: US
region: United States of America
---

# Fits 1/8" & 3/32" chains 18T precision teeth Compatible with 3-tab coaster brakes SG-3C40 Nexus Sprocket (18T) | bike-cassettes-and-freewheels

**Price:** $26.80
**Availability:** ✅ In Stock

## Summary

> ⚙️ Upgrade your ride with Shimano’s silent power boost!

## Quick Answers

- **What is this?** SG-3C40 Nexus Sprocket (18T) | bike-cassettes-and-freewheels
- **How much does it cost?** $26.80 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/8757063-sg-3c40-nexus-sprocket-18t-bike-cassettes-and-freewheels)

## Best For

- Customers looking for quality international products

## Why This Product

- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Dual Chain Fit:** Optimized for both 1/8" and 3/32" chains, ensuring versatile drivetrain upgrades.
- • **Effortless Upgrade:** Replace noisy, warped sprockets with this sleek silver cog for a whisper-quiet ride.
- • **Precision Engineering:** 18-tooth sprocket crafted for smooth, quiet, and efficient power transfer.
- • **Seamless Compatibility:** Works flawlessly with Shimano Alfine, Nexus, and any 3-tab coaster brake or internally geared hub.
- • **Durable Shimano Quality:** Trusted brand with a proven track record for reliability and longevity in cycling components.

## Overview

The Shimano SG-3C40 Nexus Sprocket (18T) is a precision-engineered bicycle cog designed for seamless compatibility with Shimano Alfine and Nexus hubs, as well as any 3-tab coaster brake system. It supports both 1/8" and 3/32" chains, delivering smooth, quiet, and reliable drivetrain performance. Lightweight and durable, this sprocket is the perfect upgrade for cyclists seeking a high-quality, whisper-quiet ride.

## Description

Shimano Alfine and nexus cogs work with either a 1/8 or 3/32 chain. Will also fit any 3 tabbed coaster brake or internally gear hub.

Review: quality sprocket - I bought a cruiser bike with a KT coaster brake and KT sprocket. The sprocket was warped and the shape of the teeth was primitive. It was not meshing properly with the chain and making lots of loud ugly noises. The Shimano sprocket was a perfect replacement and everything is working quietly and smoothly.
Review: Great - This was one of my early purchases and got me off to a good start delivery on time part perfect cannot fault it everything good, can recommend product and company.

## Features

- Will also fit any 3 tabbed coaster brake or internally gear hub
- Will work with either 1/8" or 3/32" chains
- Shimano Reference Number: SG-3R40

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B001GSSO1W |
| Best Sellers Rank | #400,163 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #377 in Bike Cassettes & Freewheels |
| Brand Name | SHIMANO |
| Color | silver |
| Customer Reviews | 4.6 4.6 out of 5 stars (29) |
| Date First Available | September 27, 2008 |
| Included Components | Internally Geared Hub Part |
| Item Dimensions LxWxH | 2.75 x 2.75 x 0.25 inches |
| Item Package Dimensions L x W x H | 3 x 3 x 0.1 inches |
| Item Weight | 0.01 Ounces |
| Manufacturer | Shimano |
| Model Name | Nexus & Alfine Cogs |
| Number of Items | 1 |
| Package Weight | 0.05 Pounds |
| Part Number | Y32203420 |
| Size | 18T |
| Style | Internally Geared Hub Part |
| Suggested Users | Unisex-Adult |
| Warranty Description | Limited Warranty |

## Images

![SG-3C40 Nexus Sprocket (18T) | bike-cassettes-and-freewheels - Image 1](https://m.media-amazon.com/images/I/917HPmRy6zL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ quality sprocket
*by E***L on July 1, 2023*

I bought a cruiser bike with a KT coaster brake and KT sprocket. The sprocket was warped and the shape of the teeth was primitive. It was not meshing properly with the chain and making lots of loud ugly noises. The Shimano sprocket was a perfect replacement and everything is working quietly and smoothly.

### ⭐⭐⭐⭐⭐ Great
*by S***Y on June 25, 2014*

This was one of my early purchases and got me off to a good start delivery on time part perfect cannot fault it everything good, can recommend product and company.

### ⭐⭐⭐⭐⭐ Works great looks great
*by I***N on December 23, 2019*

Works perfect 👍

## Frequently Bought Together

- Shimano SG-3C40 Nexus Sprocket (18T)
- Shimano SG-8S31 Alfine/Nexus small parts kit
- SHIMANO Nexus 16 Tooth cog, Black

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-07-21*