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I like to document so that if someone is looking for the relevant info they can find it easily (this includes my fucked memory).
Finding what size tyres actually come up on different rims and what will fit in different frames is the fucking bane of bike tyre choice these days.
Basically, if you don't accurately document your tyre usage you're a total bastard and should hand your bikes in immediately.
Are you doing a PHD in this field?