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Might be walking a lot of the loose stuff anyway, depending on if it's up or down. I don't think Mikko had particularly fat tyres last year (25 or 28mm Duranos or something similar).
Actually maybe the Durano were from TCR.
https://www.randonneurs.fi/transcontinental-race-2018-complete-kit-list/If this is his bike it maybe has 32mm CX tyres?
https://www.flickr.com/photos/mkpaa/albums/72157671676293257
Yeah, he used Marathon Mondial
That guy, what a hero
Mental to see people on tyres under 40mm