Thank you for the answer.
You’ve written that Bigaplles do not last very long. What do you mean?
18" Kojaks last about half a year in “acceptable” condition, after that the puncture tube fixing is a must once a week. All of these are the urban ridings but with different surfaces : pavements , bike paths, tram trails crossings, kerbstones , some wierd little stones on the streets etc. and of course the broken glass sometimes. Kojaks I have are cut , It happened that Kojak was damaged by the bad angle raid on a kerbstone.
Kind regards
Greg