a little closer to the original topic, here's my creo set up for gravel and light singletrack. flat pedal, 42mm rene herse knobby tires, tubeless of course, cheap aluminum wheels, sram 10-42 in the back.
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sometimes the gravel is more like easy singletrack, although this particular route also has wooden steps, rutted sections, rocky washouts, etc. but generally perfectly doable on a rigid bike with 38+ tires.
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with a group, all different types of bikes from full squish to road.
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the only reason i'd ride gravel again is the opportunity to get to relatively uncrowded semi-wild places. otherwise, in this part of the world, i find roads more to my liking. this was an early ride, still clipless.
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here's the bike as i had it set up most of the time, one piece cockpit, gp5000 tubeless, roval terra clx rims (25mm interior width, the same rims as on the current s-works creo 2, worked beautifully with 28 and 30mm tubeless road tires), speedplay pedals, etc.
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it was a nice road machine, but the gearing really wasn't ideal for areas with hills. OK at the low end, but 42:10 at the high end isn't enough to keep pedaling on a long, fast, hard descent, and the gaps between the cogs are way too big for road riding on the flats where you want to settle into a particular cadence at a particular speed.
here is the road e-bike i replaced it with. it is 5lb lighter (23.5lb vs 28.5lb), has more traditional aggressive road geometry (note the headset), a wider gear range with one tooth steps for the first 5 gears, traditional cranks for a standard and highly accurate power meter, and is much more aerodynamic with a significantly thinner downtube, front fork, faired head tube, dropped seatstay, slightly deeper rims, aero seat post, etc etc etc. in short, it's actually a road bike, not an all-road or gravel bike. each of these elements is relatively small by themselves as compared to creo 2 (except the drivetrain and head tube angle) but add them all up and it's really a very different experience. it does just fine on short (up to a couple km) stretches of dry gravel as needed, but i would never choose it for a ride with significant off-road elements.
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i have around 2,000 miles on it and would strongly recommend (as well as the many very very similar bikes from orbea, wilier, etc) to anyone who wants a ROAD e-bike and isn't hoping for it to propel them up steep hills all by itself.