It's protecting the inner-tube from rubbing against the screw heads of my DIY studs. Did the same thing last year and it worked great.
this post was submitted on 07 Mar 2026
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I wonder how tubeless would work instead of tubes? The sealant would nicely seal the screw holes and you wouldn't risk punctures or other annoyances with the screws
It might work for a while but this is a fatbike and I run it with extremely low tire pressure which puts a lot of stress on the tire sidewalls. At some point they start crumbling and splitting open so much that I can stick my finger between the tire and the tube. Sealant won't help with holes that big.
I did run these without the inserts for about 100 kilometers or so and the tubes held up just fine but there was impressions from the screw head already visible on it.