I think it's fairly widely acknowledged that the only thing that comes anywhere near a gym workout similarity is a standing start. The reality is that even a slow cadence is in the 70-90rpm range for road or track. Could you imagine moving a bar in a leg movement anywhere near that speed, let alone in the more powerful ranges of 120+rpm. Use the gym for strength development, but if you're chasing similarity, just get on a trainer or the track. It will be a far better use of your time