Frame and fork appear to be the same except the Pro comes with a RP23 and the Deluxe has an RP2. The Trek site does not specify Boost Valve on the deluxe. My understanding is the difference should only be the Propedal settings. The RP23 has 3 settings and the RP2 has effectively one (on or off)?
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: HiFi Pro/Deluxe - RP23 v. RP2