They do come with a short piece of tape, covering where the rim butt weld joint is. This tape can become hard with age, wrinkled from tire changes and puncture tubes. I throw the tape away and polish the weld smooth, something Mavic should do for the price they charge.
Not a bad idea to put a small strip of tape across the valve hole though (with a hole punched through, of course). I've seen a number of flats from the sharp-ish edge of the hole on Ksyriums.
Not a bad idea to put a small strip of tape across the valve hole though (with a hole punched through, of course). I've seen a number of flats from the sharp-ish edge of the hole on Ksyriums.
Can't hurt, but I just put a chamfer on the inside of the hole and have had no problems in over 45k miles. The thickest part of a tube is located at that hole, because that is where the valve stem is vulcanised onto the tube.
No! If that hole has a sharp enough edge to penetrate a tube at the valve stem, which is the thickest part of the tube, remove the sharp edge. My tubes only weigh 50 grams, and I have never had a leak caused by this hole, in 50,000 miles.