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Old 01-01-19, 10:20 AM
  #2  
dabac
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20-25 PSI is MTB territory.
IMO you’re asking for trouble running that kind of pressure on a 33 mm tire.
If not pinch flats, then rim damage.
And yeah, unseating CAN happen. Tires actually coming off is quite rare, but most MTBers running tubeless (at low pressures have at some time ”burped” a tire.
What MIGHT work for you if you wish to keep pushing the envelope is to build up the rim diameter some. Find a tape that’s a good fit between the rim’s brake tracks and layer up. Some use a cellular/spongy tape intended for pipe insulation.
Some cut strips of that thin, bubbly stuff used under floors.
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