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At low pressures there can be some movement between the bead and the rim. Even without a full pop out. I have seen blades of grass, twigs etc sticking out between the bead and rim before. So very easy for some sand to work it's way into this space and cause a slow leak. As said above as well can get small holes from debris and especially barbed wire. Running at low pressure these can sometimes occur in the sidewall. I have had this issue before. Bottom line is that you need to get the tire checked out at a tire shop whenever this happens. If you are lucky the tire will be damaged and you can make the man maths work to get a tire upgrade!

I had the same issue a quite a few times myself. Mostly after a pop-out, where sand was stuck between the rim and the tire. It also seems to happen after very sharp turns in soft sand, when the tire pressure is low. The main culprit is the size of the tire wall: too small due to the size of rims needed to wrap around the large brake calipers. Apparently very easy to collect sand and not easy to just flush it out. This has given me quite some unwanted work in the desert. On top of it, annoying costs and time wasted at a tire shop afterwards to clean everything out again. It's one of the reasons I want ( read "need") to change the "soccer mom" 20 inch rims on my car. Unfortunately not an easy project with my Defender. Till then, I choose to run on slightly higher pressure, no guarantee but reduces the problem.

Most likely some sand got inbetween the rim and the tire. Bring it to a tire shop and let them remove the tire and clean tire and rim properly. That should do it 😄

Updating my thanks to include @Aser, @Zsolt and @Myrko. Starting to like this thread! “…a gentle push to keep momentum”, a very Carnity-like phrase, @Zsolt By all means do, @Myrko! Will be fun

Congrats Herman, hope to join you after this weekend!!!

Thanks, all @ Team Carnity for allowing the promotion but more than anything for the support, the instruction, the patience and the fun shared and given in all drives at all levels. Feel very fortunate to have joined and become part of this club, with its shared values and flawless comraderie through all our different backgrounds. Looking very much forward to this next chapter, growing skills and meeting all of you in the shared adventures yet to come!