Calvin demonstrates how to remove and install cassette cogs and choose the correct lockring tool.

Important note!
There's another cog system called a "freewheel", and the procedures in this video are for cassette systems, not freewheel systems.
If you're not sure what you've got, watch this other video to help you determine which is which.
▶︎    • Determining Cassette/Freewheel Type &...  

Why are we doing this? Sprocket teeth wear over time and no longer engage the chain leading to poor drivetrain train performance and chain skipping. This procedure is also used when replacing the cassette for an upgrade or to changing gear ratios.

Video contents:
00:00 Preliminary Info
01:37 Lockring Tool Selection
02:07 Removal Process
05:41 Installation Process

Questions or comments? Leave them below!

➤Other Cassette & Freewheel Videos:
Determining Cassette/Freewheel Type & Tool Selection ▶︎    • Determining Cassette/Freewheel Type &...  
Freewheel Removal & Installation ▶︎    • Freewheel Removal & Installation  

➤ Tools & materials used:
Cassette Lockring Removal Tool:
• FR-5.2 Cassette Lockring Tool: https://www.parktool.com/product/cass...
Other options:
• FR-5.2H Cassette Lockring Tool With Handle: https://www.parktool.com/product/lock...
• FR-5.2G Cassette Lockring Tool With 5mm Guide Pin: https://www.parktool.com/product/cass...
• FR-5.2GT Cassette Lockring Tool With 12mm Guide Pin: https://www.parktool.com/product/cass...
• BBT-5/FR-11 Bottom Bracket Cassette Lockring Tool (for Campagnolo®): https://www.parktool.com/product/free...

Freewheel Tool Driver (wrench):
• PAW-12 12-Inch Adjustable Wrench: https://www.parktool.com/product/adju...
Other options:
• FRW-1 Freewheel Remover Wrench: https://www.parktool.com/product/free...
• TW-6.2 Ratcheting Click-Type Torque Wrench: https://www.parktool.com/product/ratc...

Grease or Anti-seize:
• PPL-1 Polylube 1000™ Lubricant (Tube): https://www.parktool.com/product/poly...
Other options:
• ASC-1 Anti-Seize Compound: https://www.parktool.com/product/anti...
• PPL-2 Polylube 1000™ Lubricant (Tub): https://www.parktool.com/product/poly...

Chain Whip:
• SR-12.2 Sprocket Remover / Chain Whip: https://www.parktool.com/product/spro...
Other options:
• HCW-16.3 Chain Whip / Pedal Wrench: https://www.parktool.com/product/chai...
• SR-2.3 Sprocket Remover / Chain Whip: https://www.parktool.com/product/spro...
• CP-1.2 Cassette Pliers: https://www.parktool.com/product/cass...

For a text-based walk-through of this process:
https://www.parktool.com/blog/repair-...

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• Visit our YouTube Channel:    / parktool  
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