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The stem is the part of the bicycle that secures the handlebars to the fork.

6 votes
2 answers
276 views

Why are thorn resistant tubes prone to valve stem failures?

I have seen numerous examples of so-called “thorn-proof” TP tubes, of different makes, on customers’ bikes, where the Schrader valve stem has ripped out from the tube. … However, even with TP tubes that are bang on the numbers, and inflated close to the max. recommended pressure, we see a common excessive failure rate where the valve stem parts from the tube, sometimes …
Henry S's user avatar
  • 267
4 votes

Why are thorn resistant tubes prone to valve stem failures?

At its heart is the thin and weak joint between the TP tube and valve stem, because that is all they can get from their suppliers in Taiwan. …
Henry S's user avatar
  • 267