so would be punting in the 50 +/- region
Sounds about right.
Despite what Cumbria Tourism say, cyclists are not known to be big spenders - quite the reverse.
I also doubt there are enough cyclists staying overnight to support a business.
My view is you need to offer an attractive place to stay for everyone, the cycling facilities being an additional part of that offer.
Another likely market is walkers.
Targeting them would be relatively straightforward because a lot of your cycling facilities will also be attractive to walkers.