Just a bit fragile.
Fair enough. I'm only about 500 miles in on these but no issues so far, even running them (accidentally) as low as 45psi with my 100kg on 'em.
I've been using them tubeless and they're brilliant, but I've used many Ultremos and the like as standard clinchers and none have survived the lanes of Hertfordshire.
@TurtleRecall started
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Just a bit fragile.