Dirt Bike Tube Valve Stem Nuts

This will keep your tubes from ripping at the valve stem in the case of movement in the tire. If you tighten the nut to the rim then it will stress the tube where the valve stem mounts when the tube is trying to walk this creates a good chance of tearing the tube in this area and giving you a flat. Doing that can pull the valve stem too high into the rim and cause the valve to tear away from the tube and or cause a rip or puncture.

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The guy i bought the bike of raced enduro events and was quite good.

Dirt bike tube valve stem nuts. When i changed the rear tyre the valve stem nut was on the inside of the rim done up to the bottom of the stem. Never tighten the nut on the valve stem down to the rim. You do not want to tighten the valve stem nut down to the rim because the tubes walk inside the tire. The valve stem is vulcanized to the tube and can be torn off if the tire spins on the rim so be sure the rim lock is properly installed.

Those nuts they include with presta valve tubes are unnecessary. I suppose to keep the tube off the inside hole edge if the tube moves round. I use nuts on road bikes even if they aint too fast and no nut on dirt bikes so valve stem can move around it s no fun trying to race on a flat even if you are in muddy conditions never tighten nuts right down though it can stress the stem to tube connection finger tight plus one flat should be more than adequate. Adam jason show proper positioning of the valve stem nut on dirt bike tires.

I ve been riding without using them now for a number of years and have had no problems. Using a presta valve on your mountain bike.