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Replacing 7 speed freehub body with 8, 9, 10, 11s freehub. 3x7 to 2x9 or 1x11 drivetrain upgrade. - YouTube
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maintenance - 7-speed MTB cassette on 8/9-speed wheel hub, where does spacer go? - Bicycles Stack Exchange
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Amazon.com: MTB Bike Hub Disc Brake Hubs Front Rear 7/8/9/10/11/12 Speed Cassette with Quick Release Lever 6 Claws 24H 28 Holes 90 Clicks 6 Bolt Mountain Bike Bicycle Hub Set (Color :
![Shimano NOS Bicycle 600EX Cassette Hub, 6, 7 Speed 126mm spacing, 32 hole – Loose Screws Bicycle Parts Shimano NOS Bicycle 600EX Cassette Hub, 6, 7 Speed 126mm spacing, 32 hole – Loose Screws Bicycle Parts](https://i0.wp.com/www.loosescrews.com/wp-content/uploads/2015/12/SH-600CH_1.jpg?fit=2393%2C1600&ssl=1)