Mechanics: I just measured mine: The actual diameter of the threaded metal piece that goes through the rim is: 10.14mm. The diameter of the rubber bushing that is inside the rim is approximately 11.2mm It is difficult to measure accurately as it is rubber and appears to have a slight taper. The entire assembly weighs 1.15 ounces, which may affect your balance a bit. depending on what type of stem you are replacing. You will work on your bike. You will find that it is just a rubber seal on the inside. Others I've used have pads on both sides, but I really don't think that would make a difference. My front tire is 110mm wide and I use Garmin TPMS sensors so the valve stem assembly sticks further than I would like. . Almost parallel to the outer edge of the tire. I ride this bike off-road and this profile bothers me a bit. I'll probably rotate the assembly to be more than 45 degrees, not 90. However. very nice addition!
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