In the days of the same problem with Blue Streak Tyres (1970s)...
One trick was to FORCE the tyre walls apart over-night while warming the tyres (keep then in your kitchen or something). Then, after 8 hours or so taking them outside to cool again. It stretches and then 'sets' the rubber in to the shape that you need to bead the tyre. The side walls will now slope OUTWARD for a short while after you remove the 'packing'.
Obviously, there's LOADS of methods of packing the side wall outward. I used to use 4 short lenghths of wood per tyre, sawn to the same length which was as far apart as I could PULL the side walls by hand. You could use multiple disks of polystyrene that JUST fit inside the tyres, a wide rimmed FRONT wheel pushed INTO the tyre (not fitted TO it)..... etc. etc..
It worked for us when karting was more FUN so it should work for you lot now. I can't promise it will as I have not tried it with the new tyres.
Remember.... only REMOVE the packing seconds before you are about to fit the tyre or it will 'relax' back into it's 'closed' shape again over a time.
Tell me if it works on these new tyres.
Ian
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