I have a friend with a 1999 Trek VRX400 and it has front cable actuated Hayes disc brakes and v-brakes in the rear. The hub on the rear is ready to accept a 6 bolt rotor but the two holes on the non-drive rear stay are so close together that no current Shimano, Avid or Hayes adapter will fit. If he had bought the 500 model that year, it would have had rear disks, so I know it is possible.
Any thoughts or does anyone have such a beast?
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: Trek VRX400 Disc Brake