heart rate difference indoor v outdoor

I cycle 3 times a week,twice outdoor and  and in the interest of matrimonial bliss indoor at weekend.

My heart rate zones are as per strava

I'm 34 Resting heart rate 42bpm

zone 1 -116

z2 116-153

z3 153-172

z4 172-191

z5 191 til whenever I am sick or pass out have seen 197.

What I am finding is that when I ride outdoors solo or in a group I can sustain a rate of 170-180 for the length of a sportive. Indoors I can barely reach 170 going all out let alone sustain it.

Anyone got ideas why I am seeing such a big difference?

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