Shimano | SKU: 4550170443641

Shimano Deore XT RD-M8100 SGS 12-Speed Rear Derailleur Shadow+ Long Cage

Name: Rear Derailleur 12 Speed Shimano Deore XT RD-M8100 Shadow+ Long Cage
Brand: Shimano
SKU: 4550170443641
Price: 229.0 AUD
Availability: InStock

$229⁰⁰

Shipping & Delivery*

Standard Shipping

All parcels shipped with Australia Post with tracking. The delivery fee depends on the size and weight of your ordered items.

$8.00 - Small (FREE over $150)
$10.00 - Medium
$18.00 - Large

Heavy, Oversized Delivery

Heavy, oversized items incur additional fees and are shipped using a tracked Courier Service.

$30.00 - 3 to 5kg
$50.00 - 5 to 8kg
$100.00 - 8 to 15kg

This includes items like home trainers, trailers, car racks, child seats and more.

These rates are limited to VIC, SA, NSW, QLD, and TAS. Contact us for a quote to NT or WA.

International Shipping

We offer international shipping to New Zealand and USA on selected items. Excludes bikes, scooters and heavy/oversized goods.

When will my order be shipped?

0-2 business days - All items in stock at one location
2-5 business days - Items stocked at multiple locations

Returns

Get in touch with our orders team at orders@ivanhoecycles.com.au within 30 days of receiving your goodies if you'd like to organise a return, exchange or credit.

Shimano Deore XT RD-M8100 SGS 12-Speed Rear Derailleur

The Shimano Deore XT RD-M8100 SGS rear derailleur is designed for aggressive trail, enduro, and cross-country mountain biking with fast, precise 12-speed shifting performance. Featuring Shimano Shadow RD+ technology, the long cage XT derailleur delivers improved chain stability, quieter drivetrain operation, and reliable shifting performance across rough terrain.

Optimised for Shimano 12-speed MTB drivetrains, the RD-M8100 SGS is compatible with 10-51T cassettes and uses larger 13T pulleys to improve drivetrain efficiency and chain management.

Key Features

Shimano Deore XT RD-M8100 SGS rear derailleur
12-speed MTB drivetrain compatibility
Compatible with Shimano 10-51T cassettes
Shimano Shadow RD+ clutch technology
Long cage SGS design for wide-range gearing
Improved chain retention and quieter shifting
Low-profile design reduces trail impacts
Larger 13T pulley wheels improve efficiency
Optimised for trail, enduro, and XC mountain bikes

Compatible With

Ideal For

Perfect for riders upgrading or building a Shimano Deore XT 12-speed mountain bike drivetrain for trail riding, enduro racing, and technical off-road terrain.

Frequently Asked Questions

Is the Shimano RD-M8100 compatible with 11-speed drivetrains?

No. The Shimano Deore XT RD-M8100 is designed specifically for Shimano 12-speed MTB drivetrains.

What cassette size is compatible with the RD-M8100 SGS?

This long cage SGS derailleur is compatible with Shimano 10-51T 12-speed MTB cassettes.

What is Shimano Shadow RD+?

Shadow RD+ is Shimano’s clutch technology that reduces chain slap and improves drivetrain stability on rough terrain.