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I managed to build a 29er hardtail MTB as a total novice and now I look to a new project. I want to build a sub 5kg carbon bike. The plan is a Chinese carbon frame, Chinese gears, but Shimano brakes.
1) Is there any disadvantage to a single chainring for casual cycling? I don't find range to be an issue on my MTB, the key thing was nailing the correct chainring teeth number. Lack of a front derailleur saves weight & complexity.
2) Disc or rim? Rim weighs less so I'm leaning toward that.