Setup my gravel tires tubeless earlier this year. Haven't noticed any flats or leaks. Since it has been a few months since they were setup tubeless is there any maintenance that needs to be done? Adding sealant, removing and replacing the old sealant? or just keep on riding?
I use Orange Seal Endurance, and fill it up every 6 months. You can make a dipstick if you want (going through the coreless valve stem) or unmount them in 6 months to see how much sealant is left.
Also, rotate them every month or more often (weekly might be ideal). I remounted some tires one spring and found that over the winter the sealant had dried into a nice little hard puddle at the bottom of my tire. oops.
Sooner or later you'll probably want to peel out all of the dried sealant, but I'm not too worried about that. If you use Stan's sealant, you'll want to let the stanimals go free.
I keep my bikes in a cool basement, and have only topped off my Stan's once per season. As suggested, make a little dipstick, pull your valve core, and see how much sealant remains in the tire. Inject more through the valve stem if needed.
Yes you can break the bead and check/put more in that way, but if you have WTB KOM rims and WTB tires your screaming thumbs will wish you'd just gone through the valve stem 😅
