Bike came in for a stuck seatpost, Aluminum frame with a carbon post. Technically carbon and aluminum reject each other when you introduce water, sweat or sea salt, two of which our bikes see an abundance of. The introduction of any one of these can start the galvanic corrosion process causing what is basically an expansion of the aluminum putting excessive pressure where it is forming and effectively seizing the post in place. Road riders and triathletes typically do not notice until they need to change their fit. MTB riders might catch it sooner because dropper posts require seasonal cable changes or overhauls. Regardless of what bike you ride, and especially if you live in a moist environment, you should be yanking out your post to clean and reapply carbon paste/gripper to effectively create barrier to prevent this from happening. Let me tell you, the sound of the post breaking free in the machine can be both alarming and awesome at the same time. Unfortunately this frame had galvanic corrosion that was showing on the outside of the frame in a few places, weld included. As pressure was applied to pull the post free the destruction process was realized and a crack formed from a corrosion point. Go check your bikes!!!!

When I drop my PSI in my Fat Bike back tire below 5, I am constantly loosing air and have to pump up the tire. Noticed a lot of sealant on the outside of the tire. Any recommendations besides going to a tube?