Name: RT-EM300 Disc Brake Rotor
Brand: Shimano
SKU: ERTEM300M
Price: 42.99 CAD
Availability: OutOfStock

$42.99

Shipping calculated at checkout.

Rotor Size (mm)

180

203

In stock, ready to ship
Backordered, shipping soon

UPC / SKU

UPC: 192790443157
SKU: ERTEM300M

Multiple Financing Options

FREE SHIPPING on eligible orders over $150

Secure checkout

[{"id":47909559926971,"title":"180","option1":"180","option2":null,"option3":null,"sku":"ERTEM300M","requires_shipping":true,"taxable":true,"featured_image":{"id":42574469005499,"product_id":8434518982843,"position":2,"created_at":"2026-06-02T13:58:55-04:00","updated_at":"2026-06-02T13:58:56-04:00","alt":null,"width":2048,"height":2048,"src":"\/\/thebikezone.com\/cdn\/shop\/files\/BR1200_44f9efd6-4827-4b68-b396-548c1174f126.jpg?v=1780423136","variant_ids":[47909559926971]},"available":false,"name":"RT-EM300 Disc Brake Rotor - 180","public_title":"180","options":["180"],"price":4299,"weight":313,"compare_at_price":null,"inventory_management":"shopify","barcode":"192790443157","featured_media":{"alt":null,"id":32236491833531,"position":2,"preview_image":{"aspect_ratio":1.0,"height":2048,"width":2048,"src":"\/\/thebikezone.com\/cdn\/shop\/files\/BR1200_44f9efd6-4827-4b68-b396-548c1174f126.jpg?v=1780423136"}},"requires_selling_plan":false,"selling_plan_allocations":[],"quantity_rule":{"min":1,"max":null,"increment":1}},{"id":47909559959739,"title":"203","option1":"203","option2":null,"option3":null,"sku":"ERTEM300L","requires_shipping":true,"taxable":true,"featured_image":{"id":42574468972731,"product_id":8434518982843,"position":1,"created_at":"2026-06-02T13:58:55-04:00","updated_at":"2026-06-02T13:58:56-04:00","alt":null,"width":2048,"height":2048,"src":"\/\/thebikezone.com\/cdn\/shop\/files\/BR1199.jpg?v=1780423136","variant_ids":[47909559959739]},"available":false,"name":"RT-EM300 Disc Brake Rotor - 203","public_title":"203","options":["203"],"price":5499,"weight":363,"compare_at_price":null,"inventory_management":"shopify","barcode":"192790443140","featured_media":{"alt":null,"id":32236491800763,"position":1,"preview_image":{"aspect_ratio":1.0,"height":2048,"width":2048,"src":"\/\/thebikezone.com\/cdn\/shop\/files\/BR1199.jpg?v=1780423136"}},"requires_selling_plan":false,"selling_plan_allocations":[],"quantity_rule":{"min":1,"max":null,"increment":1}}]

{"id":47909559926971,"title":"180","option1":"180","option2":null,"option3":null,"sku":"ERTEM300M","requires_shipping":true,"taxable":true,"featured_image":{"id":42574469005499,"product_id":8434518982843,"position":2,"created_at":"2026-06-02T13:58:55-04:00","updated_at":"2026-06-02T13:58:56-04:00","alt":null,"width":2048,"height":2048,"src":"\/\/thebikezone.com\/cdn\/shop\/files\/BR1200_44f9efd6-4827-4b68-b396-548c1174f126.jpg?v=1780423136","variant_ids":[47909559926971]},"available":false,"name":"RT-EM300 Disc Brake Rotor - 180","public_title":"180","options":["180"],"price":4299,"weight":313,"compare_at_price":null,"inventory_management":"shopify","barcode":"192790443157","featured_media":{"alt":null,"id":32236491833531,"position":2,"preview_image":{"aspect_ratio":1.0,"height":2048,"width":2048,"src":"\/\/thebikezone.com\/cdn\/shop\/files\/BR1200_44f9efd6-4827-4b68-b396-548c1174f126.jpg?v=1780423136"}},"requires_selling_plan":false,"selling_plan_allocations":[],"quantity_rule":{"min":1,"max":null,"increment":1}}

RT-EM300 Disc Brake Rotor $42.99

Rotor Size (mm): 180

Checking pickup availability

SHIMANO RT-EM300 disc brake rotors for speed sensor systems provide exceptional stopping power in all riding conditions. For use with Resin/Organic brake pads only. With Lock Ring (Internal and External serration)

The Bike Zone ships within Canada only.

Bicycle shipping is a flat $100.

Free shipping applies to other eligible orders over $150 shipped to:
British Columbia
Alberta
Saskatchewan
Manitoba
Ontario
Quebec

Remote regions in these provinces may be subject to additional shipping charges after the order is placed. Larger bulkier items can also be subject to additional shipping charges.

For more information on shipping, see our Shipping Policy

For answers to frequently asked questions, visit our FAQ page.

Need help or have a question? Contact Us by email, phone or come see us in person - we’re always happy to help.

Back to Drivetrain & Brakes

RT-EM300 Disc Brake Rotor

Product Specifications

missisauga store

barrie store

online orders support