7x7, 49 square miles. That's the entirety of San Francisco. With two feet, two wheels, or two rail tracks, it's easy to get anywhere. And while we are big supporters of our local Muni rail system, it does present one real problem for cyclists.

It looks like this.

It's called I [CRASH] SF and it's often said that if it hasn't happened to you yet, you aren't riding enough.

Muni rail tracks are the perfect width to grab a bike tire and send the rider on a short and unwanted flight into the pavement.

For those who have experienced it, we've got a T-shirt trophy for you. For those who haven't, this shirt serves as your talisman.

Printed in California on American Apparel cotton.

Remember, always cross the tracks at no less than a 45º angle. Keep the crashing to your T-shirt.

This week only we're throwing in a free I [CRASH] SF sticker. Place your T-shirt order before Monday, 8/26 and we'll include the sticker for free.

Grab yours, here.