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That's a fairly pointless question, as the resistance offered by stationary bikes (usually) isn't calibrated.

The bike isn't going anywhere, at any speed anyhow.

For general fitness purposes you're better off looking at time and intensity. 45 minutes spent at an effort level where talking begins to get difficult is a decent workout.

If you really feel the urge to guesstimate, the average speed of casual riding is often considered as 10 mph. So if you haven't broken a sweat or gotten winded, your 45 minutes on the trainer might be about 7.5 miles.

If you think you've done better than "casual", feel free to add your own guess WRT mileage reached.

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6y ago
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Q: If you ride a bike indoors for 45 minutes how many miles is that?
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