I thought Strida5 has standard metal rims so it should be good for 100psi with a 100psi tyre eg 40-305 Kwest … (but may be a hard ride). Unlike the plastic wheel I have, the 5 uses absolutely standard bike rims and an tyres. So you should be able to either fix the inner tube with a patch or replace it … I’d also check a few things …
- Has the tyre still got a thorn (even tinny) stick in it … as this will keep puncturing new inner tubes ? (tate tyre off and carefully feelthe whole inner surface for sharp points/ edges.
- Check that the tape on the in side of the metal rim is properly in pace (ie centrally on the rim) so that it covers up all the nipples … on end of spokes. Unlike human ones, these nipple can be very sharp
… and if they make contaqct with inner tube they can puncture it. - If nec. check all nipples for spikes and even use a 2nd band of rim tape over the original.
- Check the rim itself for any sharp edges facing towards the inner tube.
the nice thing about the Strida is as it doesn’t have forks check , swopping and replacing tyres and ntubes is very easy … the wheels stay in place.