likely need a top pull front D, different pull ratio then a bottom pull found on most road builds.
Get disc brakes if you can afford it on the widest hubs possible (future proof)
Get them if you don't ride in tight packs all the time (brake modulation is different and the rim brake guy behind you might rub your wheel since he can't stop as fast)
Get them if you ride in mixed weather/mixed surfaces.
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Rule #10 // It never gets easier, you just go faster.