With More People Taking Up Cycling,

the security of your bike is so important, 

and what better way of securing your bike that to have a tree, or lamppost for that matter going through the bikes frame? so here is the Yerka bike, you'll never forget to take your bicycle lock with you because it will always ride along, it's built into the bike frame, the down tube splits in two and pivots away from the bike, the seatpost slides into holes drilled into the two pieces of the downtube, forming a lock around a solid object, so now just two of those special locks that secure the wheels and your bike is safe and sound.