I've done a fair amount of touring with smaller tents, always leaving my bicycle outside to face the elements. I'm with some of the other people that have replied here, don't bother wasting your money on a big tent with a vestibule large enough to stow your bike, just leave it outside, locked up if you like. And carry a light tarp to cover it in inclement weather if you are really concerned about it. If you do much touring you'll inevitably run into days when you have to ride your bike in the rain. Riding in a downpour will put a lot more wear and tear on your bike than will leaving it out at night, so I don't see any reason to purchase such a big tent just to protect your bike