Nice find on the tubes. Schwinn's deep "Aero" wheels are a good value. But, they cause most people a headache finding Schrader tubes with long stems. People complain so much about it, I'm afraid Schwinn will drop those wheels. That would be a shame because they're really good wheels for a $200 bike. They'd cost $100 if you went out to buy them.

You'll have more choice in tubes if you switch to Presta (which is what's intended to be used with deep rims like that). It's simple to do. My post 5-6 above has a link for the rubber grommets. I've heard they're not necessary. But, I've also heard a gap on the inner wall's hole might chaff the tube. There are also metal slide-in adapters. But, they're too wide to sit inside these wheels. They're more for wider mountain-bike rims.

If you switch to Presta it also gives you some different pump choices, like the Blackburn Airstick SL. Small enough to carry in a seat bag.

Speaking of the wheels, keep an eye on your spokes. Mine (24-spoke) loosened after about 1200 miles. The nipples could spin with my fingers. Some people say these wheels (24-spoke) don't hold up. It may be that their spokes loosened and they didn't notice it.

I precipitated mine loosening. I put Bontrager Race Lite Hardcase tires on my bike (narrower, 32mm, smooth surface for lower rolling resistance, and hardcase for flat protection). They use 110 lbs. This seemed to compress the rim, causing the spokes to be loose. I tightened them and trued/dished the wheels. No problems since.

Your Solataire should hold up ok. It looks like the Trailway/Avenue but with some extra gusseting at the head tube. I'm sure you'll get your $200 out of it. Investment in tubes, tires, lights, looks, bags, seats, etc. will transfer to any other bike you buy in the future.

I think you made a good choice. You can ride while learning your style, position, experiment with seats, bars, etc. And, occasionally test ride a $400-$500 bike-store bike. You'll have a better understanding of how they feel different, what's better or worse for you, etc.

When I bought my Avenue, if I would have bought a bike-store bike it would have been like flipping a coin. Nobody wants to do that with $400. So, $200 is a good investment to get an education and be able to make a more informed $400 purchase when the time comes. Or, you may find (like me and "itsJustMe") that you have the Solataire dialed in and no other bike fees as "right."

I think that's the only way to go unless you have tons of time to watch for a used bike-store bike on Craigslist. Or, if you have a lot of money to just roll the dice on a new one. It gets you ridding and learning. You can sell it for $100 if/when it's time to move up. That's not a bad investment.