I would take this as an opportunity to get some nicer tires. blessin in disgise.

 

Take an empty spray bottle. Put an ounce or so of dish soap in it. Fill the rest with water. Shake a bit but use care not to cause suds. Lift the front wheel off the ground. Spray the entire tire with the soapy water. Check for bubbling. Where the bubbles are is where the leak is. Buy new tube. Plug the tire with a tire repair kit. Remove the front brake caliper. Place the caliper on an elevated board so as to not stretch the brake lines. Remove wheel. Take off tire and tube. Replace old tube with new tube. Put tire back on. Use balancing beads (I think they can be used with tubed tires). Fill with air. Put wheel back on bike. Replace caliper. Put wheel back on ground. Ride on.

 

Why you would want or need to remove the brake caliper? I've R&R dozens of Sporty front wheels and never seen any reason to do so. Seems like unnecessary work to me.

Just curious......

 

Just swapped my 21" for a 19" on my bike, being that it is a narrow glide I had to remove the caliper for the 19" to go on.

 

Don't use fix a flat. Buy a tire repair kit that comes with a couple of co2 cartridges. Buy a couple of extra cartridges.
Do u have a spiked rim? If so you have a tube. If not its probably tubeless.
Fill the tire with a co2 cartridge to the recommended pressure written on the tire and check how long it takes to drop 10 lbs.
That's about how long you can ride.
Don't fix it your self. Either ride it in or take the wheel off and take it in.

 

You live in Southern Cali, So I doubt it's from extreme temp change. I have a valve stem tool in my toolbox in the shed. Just a thought. Like others mentioned, pump it up and spray it with soapy water, look for bubbles. If you don't have a bike jack, you'll have to move you bike around a little to check the entire thing. Think soap+smooth concrete=injury or damage if not carefull. That may be a no brainer to some. Just say'n!! Front tire, I'm sure you can figure out yourself and be back up and runnin in no time. Back tire on the other hand takes some time. It's your bike, I sugggest some wrench time is in order. Have fun!

 

 

Because the tire will not fit past the caliper when you try to remove the wheel.

 

Use fix a flat, carry a can with you, use it until the tire stops leaking. Sooner or later it will permanently stop the leak.

 

Now there is some bad advice...

Sometimes you actually have to put a wrench on a motorcycle...

The only way to fix the flat is remove the wheel, remove the tire, and patch the tire from the inside.