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Hmm, I would have thought a rear rim would be overbuilt compared to a front to handle all of the extra torque and weight.
But yes, seeing how my rear wheel rebuild to 17" warp9 rim resulted in barely enough spoke length using the old spokes, I would not risk using the old spokes for a 1" rim increase.
I am very tempted to go the 21" route. While I'm not much of a trail rider, I have heard some RTW ADV riders proclaim that the larger wheel size is worth it even for long stretches of gravel or heavily potholed pavement.
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