There is quite a difference in components between these two. The Pro is geared 26-125 gear inches vs the Pro TT's 28-125.
COLOR Mango
SPEEDS Pro: 24; Pro TT: 27
GEAR INCHES Pro: 26" - 125"; Pro TT: 28" - 125"
DISTANCE: SEAT POST TO HANDLEBAR Min: 620mm (24.4") Max: 720mm (28.3")
DISTANCE: SADDLE TO PEDAL Min: 670mm (26.4") Max: 940mm (37")
FOLDED SIZE Pro: 36 x 66 x 80 cm (14.2" x 26" x 31.5"); Pro TT: 38 x 66 x 80 cm (15" x 26" x 31.5")
WEIGHT Pro: 10.6 kg. (23.3 lbs) w/o pedals; Pro TT: 10.5 kg. (23.1 lbs) w/o pedals
FOLDING TIME 15 seconds
SUGGESTED RIDER HEIGHT 142 cm - 193 cm (4'8" - 6'4")
MAX RIDER WEIGHT 105 kg. (230 lbs.)
FRAME K Series, SuperLite 4130 chromoly, custom-drawn double-butted Sonus tubing, forged LP hinge and drop-outs
FORK Dahon SlipStream™, Puro™ U7 aluminum, patented Fusion™ technology
HANDLEPOST Radius VRO, patented Fusion™ technology, forged aluminum, patented InSide™ lock, custom designed for Syntace VRO system
HANDLEBAR Pro: Kinetix Pro, Flat bar, 7050 aluminum, double-butted; Pro TT: Kinetix Pro TT, 7050-AL double butted
HANDLEBAR CLAMPS Syntace VRO, adjustable
HEADSET Dahon Fusion XP, Zero stack, machined aluminum cups, ACB cartridge bearings, sealed
BAR TAPE Pro TT: BioLogic™ handlebar tape, reflective bar plugs
GRIPS Pro: Ergon MR2, Magnesium bar end
SADDLE SDG BelAir ST-PU, patented I-Beam technology
SEAT POST SDG I-Beam Pro, SuperOversize, 2014 aluminum
SEAT CLAMP Dahon Turtleneck clamp
BRAKES Pro: Kinetix ProStop, forged aluminum V-brakes, aluminum cartridge pads, micro bolts, front Flex stainless noodle, stainless anchor bolt; Pro TT: Kinetix, forged aluminum, dual pivot caliper, adjustable angle pads
BRAKE LEVER Pro: Avid FR5; Pro TT: Shimano Tiagra, STI
CABLES AND HOUSING Dahon LiveWire, SIS housing, slick cable
FRONT WHEEL Kinetix Pro S w/ suspension hub, Niobium alloy rim, Sapim laser spokes, Rolf® Paired Spoke Technology™, 580 grams
REAR WHEEL Kinetix Pro w/SRAM DualDrive, 28H radial/2cross lacing, Niobium alloy rim, double butted stainless spokes
TIRES Dahon Special Edition Schwalbe Stelvio, Mango/Black, 28-406, foldable Kevlar bead, DualCompound Silica casing, RaceGuard anti-puncture protection, 120 psi
SHIFTERS Pro: SRAM DualDrive, single-sided shifter, 24 speed; Pro TT: Shimano Tiagra, STI, 2/3 x 9 speed
DERAILLEUR Pro: SRAM X7; Pro TT: Shimano 105
CASSETTE Pro: SRAM 11-28T; Pro TT: SRAM 9 speed, 11-26
CRANKSET Pro: Sugino XD, cold-forged 6061 cranks, 2014-AL chainring; Pro TT: FSA Gossamer, 53T, CNC alloy guard, ISIS Drive, Dahon Special Edition
BOTTOM BRACKET Pro: Cartridge, sealed bearings; Pro TT: American Classic UltraLight, ISIS Drive
CHAIN SRAM PC971, 9 speed, PowerLink
PEDALS Pro: MKS MTS-2 EZY; Pro TT: None