john peck
Well-Known Member
Sounds very much like an issue I´ve been having. Can´t find a puncture; failure is occuring at the valve stem, Tire & tube seem to be slippingA week ago, I had a flat in the rear wheel (unluckily, the one equipped with the hub motor, and the wheel was armed with Marathon E-Plus with Michelin Protek Max inner tubes (the latter marketed as "very hard to puncture" and "self-repairing"). Strange thing because I inspected the tyre rather thoroughly and could not find any trace of the puncture. After re-inflating the tube three times, the Michelin version of Slime apparently worked as I had no trouble to ride for the whole week. Now, suddenly, no air in the tube again.
I got furious, poured 60 ml of a good sealant for tubeless tyres into the tube, spun the wheel vigorously to spread the sealant inside the tube, and re-inflated the wheel. Let us see what the future holds.
on the rim tearing at the stem. I´ve had 3 like that & anticipate another as the angle of the stem has shifted slightly. The last time, it ripped
the valve stem right off the tube. I think I need to replace the plastic rim strip with a rubber one for more grip. Iam also using a higher tire
pressure in hopes of a better clinch on the rim (?) Also braking more gently on downhill & less throttle going up.
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