---
product_id: 8757063
title: "SG-3C40 Nexus Sprocket (18T)"
brand: "shimano"
price: "£19.13"
currency: GBP
in_stock: true
category: "Shimano"
url: https://www.desertcart.co.uk/products/8757063-sg-3c40-nexus-sprocket-18t
store_origin: GB
region: United Kingdom
---

# Fits 1/8" & 3/32" chains Compatible with 3-tab coaster brakes & internal hubs 18-tooth precision sprocket SG-3C40 Nexus Sprocket (18T)

**Brand:** shimano
**Price:** £19.13
**Availability:** ✅ In Stock

## Summary

> ⚙️ Upgrade your ride with Shimano’s sleek, versatile sprocket — because every gear counts!

## Quick Answers

- **What is this?** SG-3C40 Nexus Sprocket (18T) by shimano
- **How much does it cost?** £19.13 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/8757063-sg-3c40-nexus-sprocket-18t)

## Best For

- shimano enthusiasts

## Why This Product

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

## Key Features

- • **Precision 18T Design:** Optimized tooth count for smooth, efficient pedaling
- • **Broad Brake & Hub Fit:** Fits any 3-tab coaster brake or internally geared hub for hassle-free installation
- • **Compact & Lightweight:** Slim 2.75" x 2.75" profile with featherlight 0.27g weight keeps your ride agile
- • **Durable Shimano Craftsmanship:** Engineered by Shimano for long-lasting performance and reliability
- • **Universal Chain Compatibility:** Works seamlessly with both 1/8" and 3/32" chains for versatile upgrades

## Overview

The Shimano SG-3C40 Nexus Sprocket (18T) is a precision-engineered bicycle drivetrain component designed for compatibility with 3-tab coaster brakes and internally geared hubs. It supports both 1/8" and 3/32" chains, offering versatile installation options. Lightweight and compact, this sprocket delivers Shimano’s trusted durability and smooth pedaling performance, making it a top choice for serious cyclists seeking reliable upgrades.

## 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.

## 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 | #497,479 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #441 in Bike Cassettes & Freewheels |
| Brand Name | SHIMANO |
| Color | silver |
| Customer Reviews | 4.6 4.6 out of 5 stars (30) |
| 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 | 0.27 g |
| Manufacturer | Shimano |
| Model Name | Nexus & Alfine Cogs |
| Number of Items | 1 |
| Package Weight | 22.68 g |
| Part Number | Y32203420 |
| Size | 18T |
| Style | Internally Geared Hub Part |
| Suggested Users | Unisex-Adult |
| Warranty Description | Limited Warranty |

## Images

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

## 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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**Shop now:** [https://www.desertcart.co.uk/products/8757063-sg-3c40-nexus-sprocket-18t](https://www.desertcart.co.uk/products/8757063-sg-3c40-nexus-sprocket-18t)

---

*Product available on Desertcart United Kingdom*
*Store origin: GB*
*Last updated: 2026-09-14*