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I’ve got some new road wheels for next summer and will run then tubeless, I set them up yesterday without any sealant and the front is fine, however the rear drops to about 40psi after a couple of hours, should I take the tyre off and re-apply the rim tape or will the sealant sort it when I put it in?
Everyone uses sealant, just do that.
I’ll definately add sealant before I use them (going to wait so it’s not sat idle), but just wanted to know if it’s worth getting them perfect (or near enough) first or is there little/no benefit if the sealant will sort it out for me?
I wouldn't waste the effort as the sealant will deal with any issues around valve, gap in tape etc,.
I'd be putting tubes in both wheels for now - get the tape nicely seated, hold pressure and "shape" the tyres nicely - and then take tubes out & jizz them tubeless when you're ready