Question: I've lubed a chain on my motorcycle a few days ago, but there's a dark thing keeps flinging all over the swingarm. I'm wondering what it might be? If it's the chain lube flinging all over, then why it looks so dark, the lube I put on the chain after cleaning it is light brown, and why it keeps flinging if I wiped the excess of the lube off after lubing? How likely that it's not the lube flinging but the engine oil that's somehow leaking on the chain?

**Additional info:** The chain and sprocket were changed couple of weeks ago, everything in the front sprocket area was cleaned. The lube I use is a spray can chain lube, sticky light brown consistency.

Answer: 
Driving on a flat flexes the internal cord far more than it was designed to take, so the tire casing is compromised to an unknown extent. If you only bop around on surface streets at 40 MPH, you could probably stick with it, but I would not want to run it on a 20-mile freeway commute. A blowout at speed could damage your $$ wheel too. I would make my decision on this and whether a loved one drives that car. Your car may require both tires on the same axle be replaced together, so I understand this can be costly. If so, keep the "good" old tire for the rainy day when this happens again. If you decide to run with it, keep an eye out for any sidewall distortion, bubbles, or pressure loss for the life of the tire.
I dont' want to be sued. However if that was my tire I would drive on it. The sidewall is only abraded a little. Worst case scenario is it starts to leak some day (incredibly unlikely). Why did it go flat in the first place? Sounds like it has other problems though.