At least you wouldn’t have to worry about pinch flats.

We know the usual saying is that you can pick two qualities in a bike: Light, cheap or aerodynamic. In this case, the Play to DIY crew built a bike that manages to have none of these qualities. Weighing in at 296 pounds, their fully concrete bike (that does function!) is one of the weirdest, most fascinating bikes we've ever seen in motion.

The creators claim to have built the first concrete functional bike in the whole world. “The weight of 134.5 kg makes it very unusual but its construction process is extremely entertaining, we experimented a lot to show you this result and I hope you enjoy it,” they said on their YouTube channel.

The build process took two months. Watching the video, you can get a sense of the build process: First, they constructed a mold for the frame using lightweight wood and plastic pipes. Then, a series of thin rods were welded and glued together as the base and placed into the mold before the cement was added. Two days later, the frame was dry and ready for the rear triangle to be added on with a similar process. The bottom bracket was placed in, allowing for fully functional cement crank arms, chainrings and pedals to be added—and the pedals were made to be fully functional, not just created as part of the crankarm. (The only cheat here? A standard chainring was used, just surrounded with cement.)

The piece we’d be least excited about? A fully cement saddle. Yikes. You won’t find it on this list. But the shape is just about perfect, since the makers used clay to create a concrete mold based on an actual saddle.

Even though a helmet isn’t technically part of the bike, even a cement helmet was molded and lined with foam, for safety. (Imagine the neck ache!)

Fork, handlebars, and wheels were created in similar fashion, and finally, the bike was ready to put together. Only the chain remained un-cemented.

Finally, the bike was ready to ride—and if you care less about the process than the final product, you can skip to 20 minutes into the video to watch the bike roll (and listen to the delightful sound it makes as it goes). While it doesn’t look too comfortable to ride, it steers impressively well for being nearly 300 pounds and entirely concrete.

Molly writes about cycling, nutrition and training, with an emphasis on women in sport. Her new middle-grade series, Shred Girls, debuts with Rodale Kids/Random House in 2019 with "Lindsay's Joyride." Her other books include "Mud, Snow and Cyclocross," "Saddle, Sore" and "Fuel Your Ride." Her work has been published in magazines like Bicycling, Outside and Nylon. She co-hosts The Consummate Athlete Podcast.

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