First off, the wheels, as a few users seem to have trouble understanding how they work. When first loaded into the SPH, the outside face is pointed towards the left of the hangar when looking out the open doors. It attaches on it's inner face. When you attach to a vehicle while looking at it's outer face you will see a mark at the 9 o'clock position that is made to look like a valve stem. You must rotate the wheel,while attached, 90 degrees clockwise, so that the valve mark is now at the top, also referred to as the 12 o'clock position, for it to work when out in the world. If your wheels spin uselessly when in world, then you have not done this. Now for the fun stuff. Provides 2 colours of Kerbal sized motorbikes and their attachable side cars. 2 styles of wheels and micro docking port that you use in pairs to be able to redock the bikes or sidecars to other things. The bikes and sidecars happily redock to each other without the micro docking port but through some quirk they won't redock with standard ports. The blue bike's docking node is on it's right side and pairs with the blue sidecar that has it's port on it's left. The reverse is true for the red bike and sidecar. Both sidecars have toggleable stands that are defaulted to the landing gear button, so that you can undock them and have them stay upright. If by some chance they do get knocked over, the reaction wheels are powerful enough to get them righted. For the size of vehicles these are, the reaction wheels are quite powerful, espescially roll. This is required so that when you turn the bikes the SAS can compensate so that you don't immediately lie over flat on your side. Sometimes after undocking the reaction wheels act a little over sensitive, but if you are gentle and just tap them to get back to the angle you want it is usually no problem. It is best to attach the micro docking port to the side that isn't the bikes docking node. If you pitch back 20 degrees when driving the suspension will hop then bounce, which allows you to do small jumps. You can get serious air and do tricks in the air when riding on Duna. Typing "bike" into the part search will bring up all parts. Enjoy. If you have Mini Moke Versatile and it's Rocket Sounds Enhancement plugin installed, the wheels will have sound. BIKES ARE AUTONOMOUS, SO IF YOUR KERBAL FALLS OFF YOU CAN DRIVE BACK TO THEM. ***The very first time you put a sidecar out in the world, please extend and retract the stands twice. It is some game quirk, they are fine from then on. ***