In reply to SFM:
> What are folks thoughts on using a gravel/CX bike, do-able or would you just spend more time on foot than bike?
As amazing iconic hundred mile mountain bike routes go, this one would probably be a reasonable candidate for CX bike. But I'm hard pushed to understand why you would.... My Giant Anthem is good for 17mph average on the road, which is pretty close to my road bike maximum, and is infinitely nicer off road IMHO. My back would be in pieces after 30 miles on a CX.
The first section to the foot of Conic hill would definitely be faster on a CX than MTB. There's nothing technical. Up Conic would also be faster ( it's a carry)
As noted in my previous post, much of the trail is perfect kitty litter surface so a CX would indeed work well. The track after Falls of Falloch and after BoO are very knobbly and would be exhausting without suspension or fat tyres. devils staircase would suck.
But yes, a CX would be fine for the vast majority of it.
If you're primary concern is speed then I reckon the key bit to optimise is Conic Hill and northern Loch Lomond. Fastest bike for that section would be the smallest lightest balance bike you can find, dismantled and packed in a ruksack 😉.
I went one further and didn't take any bike at all on the LL section.
Have a look at the pictures on the link below, they show a lot of the trail surface and give a good idea on suitability.
> How long is reasonable for a more mortal older rider to take to do the route? 2-3 days?
You could do it in a day if you're reasonably fit and committed. As well as my four day trip with my 11 year old son, chronicled here ,https://singletrackworld.com/forum/topic/wet-highland-way-duathlon-with-the... I also did a solo (supported) effort in [15 hours moving ] 17.5 hours total time. Lots of leisurely stops and cream tea etc. Glen Coe onwards was all in the dark so I needed a lot of lights. It had been my ambition to do it for years but never got my shit together until that glorious run of September weather around 6 years ago where it was so stable everything was dry as a bone.
Best day cycling I've ever had.
Post edited at 10:37