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I'm not a big fan of flipping a wheel to have the option of 2 x cogs at the back, that just feels like having a shit geared bike.
I think 68 ish means you're in that compromise sweet spot for hills, down hills and flat .
From the little research I've done, the hills lengthen over the ride and a lot of riders say ease a little ?
We have a good mix of long (10KM) and short sharp climbs(20% +) locally so plenty to practise on and it'll be in 2026.
That's interesting, I may do LEJOG Audax fixed in 2026 and was a little worried about shorter steeper hills at the beginning in Cornwall and Devon.