use a proper routeplanning tool
https://wtp2.appspot.com/wheresthepath.htm
looks like a tiny hiking path to me. I'll cross my fingers that someone here knows about it and can recommend either way
Looking at the OS maps I have of the area (10 years old), there's not even an unmetalled track for the second half of that route: sheep trails only. I would expect some reasonable amount of big-based hike a bike. The main road is pretty quiet!
@bsb started
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use a proper routeplanning tool
https://wtp2.appspot.com/wheresthepath.htm