Description
Airdyne 6 Main Pulley AD-6 is a direct-fit indoor cycling part designed to restore smooth crank-drive operation on the Schwinn AD6 fan bike. Ideal for owners shopping schwinn airdyne replacement parts, this pulley assembly fits the Airdyne 6 and helps keep belt tracking and pedal performance consistent.
- Compatible with the Schwinn Airdyne 6 / AD6 indoor exercise bike.
- Fits AD6 units commonly identified with serial/SKU 100250 in published parts diagrams.
- Replaces pulley assembly part number 004-9849.
- Also referenced under alternate number 1000514256 on some parts listings.
- A smart choice when you need an ad6 airdyne airdyne main pulley ad- replacement for worn, noisy, or damaged original drive components.
This schwinn airdyne main pulley ad- assembly mounts in the crank drive system and works with the cogged crank belt used on the AD6 platform. It is intended as a quality replacement for the original pulley so you can correct slippage, abnormal drivetrain noise, or visible wear without replacing the entire bike. Depending on your machine’s condition, installation may require removal of adjacent crank-drive components and belt readjustment, so we recommend basic mechanical experience and careful comparison to your existing part before ordering. This unit is suited for routine repair work on home or light commercial Airdyne 6 bikes where dependable fit and function matter.
Get your AD6 back to a strong, smooth ride with an OEM-quality replacement that ships same day from our warehouse.
Shop the full range of Schwinn AD6 Airdyne parts at Krislynn.



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