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The sealant will dry up inside the tyres eventually and needs topping up or replacing - if the tyres are sitting in the one position for a long time you may get a lump of latex formed - you would remove the old sealant and add new stuff - if the tyres are used regularly I just put more sealant in around every 6 mths - I ah e never had a tyre sealed with sealant ever - I always make too big a hole anywayI'm up for new tyres and have been running tubeless since the last set went on. It's been a while as i had a hardtail that got preferential treatment so the tyres on it are well past it....
My question is, does the latex go off and offer no protection after a while? should i go back to tubes if it's not getting ridden as often as it should?
Luckily i've only had a few punctures but i'm fine with replacing a tube on a trail, i like the convenience of tubeless, especially if it seals up a puncture or tear but if the old latex won't do that i'd rather have tubes than have to top up (how often?) before riding to make them workable