Which Schwinn Airdyne is this—and does the model matter?
AD2, AD4, AD5, AD6, AD7, Pro/Comp… yes, it matters. Here’s how to tell them apart.
Explore the Airdyne guide →FIELD NOTES · GEAR + HOME GYM
The stuff you search before buying the stuff.
Practical comparisons, used-buy guides, and home-gym decisions informed by the same equipment catalog behind GearKoala.
Concept2 RowErg vs. Rogue Echo Rower: what changes when you buy used?
New-price context, resale evidence, parts support, and what to inspect.
Article in developmentWhat should you actually buy first for a home gym?
A decision framework based on training style, space, budget, and what tends to be worth buying used.
Article in developmentUsed vs. refurbished vs. new: when is the “deal” not really a deal?
Why MSRP alone is a terrible used-equipment benchmark.
Article in development