I have a friend who has been using the 21" with good results. He rode about 1/2 the enduro season here in New England without a failure and it's about as rocky here as anywhere. There are some tricks to mounting them initially and getting the system to hold air but once you figure it all out they work great.
TONS of info on KTM Talk in the tire and wheel section so check there for sure.
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07 EC 300 (under 500 miles, selling soon)
97 KTM 250 EXC (sold)
2016 Trek Remedy 29er
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