I taught our children (because I'm horrid) to change tyres on things like Conti Gatorskins and Vittoria Rubinos on 700c rims.
Whilst these are not Marathon PlusAttitude My-Tyres-Are-Stronger-Than-Yours Geekology Specials, they can still behave in a threatening way towards digits, nails and self-esteem.
Imagine, then, the surprise of one of my brood when asked to change the tube in a folding Maxxis Ignitor on an old MTB wheel.
It fell off the rim like well-roast chicken tumbling away from the bone. She really just looked at it and frowned and off it fell.
And our pet cat could have popped it back on. With one paw tied behind his back. Blindfold.
There are tyres and tyres, as my children now appreciate.
But not my cat, as my mention of him was hypothetical. He is not interested in bicycles.