September might not be too bad if it stays dry-ish beforehand. We did it in March & it was wet from lots of snow melt & rain. The hikey section is from Ben Alder Cottage (bothy) & up the Bealach Breabag. It’s more like 2.5 km to the col, & I know I couldn’t ride it in the dry never mind the wet. The drop down to Loch Bealach a Beithe was also a bogfest as was the lochside track.
Having said that, I’d do it again but mebbe as an overnighter & incorporate the Ardverikie loop into it.
Here’s the view (?) from the col after the bothy…
EDIT, we did it anti clockwise.
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Newtonmore 2012 025[/url] by jimmyg352[/url], on Flickr
& from the climb after Culra Bothy…
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Newtonmore 2012 015[/url] by jimmyg352[/url], on Flickr