There’s marathon and there’s racing XC loops over longer periods.
Former eg National Marathon Champs – IOM on Manx 100k course. Longest climb 345M, total ascent 3,250m over 100k or 4,968m over 100miles.
Latter eg Torq in your sleep – 100miles (12 laps) and a paltry 1,200m climbing
My experience was that I absolutely needed every ring of my 3×10 on the Manx 100 because the distance and climbing involved meant you couldn’t ‘go into the red’ to overcome gearing deficiencies because the red might last 15minutes and happen again and again and again and… Gearing right down would compromise the road/fireroad sections
TIYS – A 2 minute hike into the red not so much of an issue and if it is it’s no big deal walking up a short sharp ramp – I did from the get go – might have lost 10 seconds per lap max.
Real distance and real hills – 2x, racing 24:12, TIYS etc 1×11.
What advantage do you hope to gain by making this ‘consolidation’? Is an Orbea noticeably lighter, stiffer, plusher, racier than your current 2 bikes. What will you do when the weathers shit and it’s a mudfest.