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Chak
edscoble
In regard to this, the other 650b bicycle I've ridden was the Cannondale Slate with the 40mm Schwalbe G-One tyres.
In the trade show, I rode it in a very twisty singletrack in Cannock Chase Forest to see how I get on, there's some section that have what felt like a massive 40% climb on loose gravel, as well as descending on the very same gravel.
The 40mm width was just on the threshold of being too small, no way I would ride a cyclocross bike on that particular singletrack, the tyres perform O.K. but it's quite likely the pressure was a little on the high side to really provide decent traction (bit of wheel slippage on the climb), and doesn't quite work when it's slightly muddy unfortunately but it was much more confident-inspiring than a regular CX tyres at 35mm, and I was surprise how stable it feel at 40mm as it look tiny compare to the Grand Bois Hetres.
So as long you stick above 40mm, I reckon you won't have any problem, especially if you're already a confident rider.