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Got this thought as well for my Croix de Fer. Got a 36/46 on the front and 12-32 on the back (ostensibly 11 speed but free hub is too narrow so dropped the 11 speed cog). For the riding I've done so far I haven't been out of the 36, but I think when I put some slicks on and take it on the road I'll use the 46. The thought of 1x10/11 scares me unless you're doing one type of riding only.
Have said that, people tour on fixed so... -
Nah, not totally bonkers, but it work, if by light tourer you mean a very small pair of pannier or bikepacking, then that ratio work well for the majority of ride, you got a decent range from 109GI to 33GI.
33GI is a little on a high side (28GI is usually idea), but as long you don't have any alpine climb to deal with, If you don't mind not being able to descent fast (panniers won't let you go more than 70km/h I notice), a 40t chainring would be apt.
FWIW, my fixed tour is 65GI with bikepacking, was a little spinny on a long flat route with tailwind but acceptable for everything else.
@edscoble Am I totally bonkers thinking about doing a 1x10 setup on a gravel grinder / light tourer? I was thinking going 44t Narrow Wide in the front and a M771 11-36 mtb cassette in the back. Advise please.