Climbing from Grenoble up to the Col de la Croix Perrin,
you soon leave the city behind and find yourself climbing on a wooded
road, passing through impressive gorges just after the village of Engins.
The route takes you to the Balme de Rencurel before the final ascent
of the Col de Romeyere. Take time to stop for the waterfall views just
before the road splits, and I recommend you take the right option which
will miss the tunnel . The Grenoble cycle track starts near the bottom
of the climb so its a pleasant run back to the city.