This magnum ball bearing is for a spindle assembly for 30", 40" and 50" ZTR chain drives. Oregon® replacement parts are built to meet or exceed OEM standards. Many parts look similar, so it’s crucial to ensure you’re choosing the right replacement for your original equipment or engine model. Not sure? Use our Parts Lookup Tool to view part diagrams and find the correct replacement.

• Outer diameter: 52 mm, Inner diameter:1", Width: 21.50 mm
• Reference number: RA100-RR (prior to 1999)
• For spindle assembly, 30", 40" and 50" ZTR chain drives

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