Jamis DXT A3 Step-Over Frame 2025
2025 Urban
Estimate price |
649$
Weight | 14.4 kg 
Bike details
Overview
Key information split into simple groups.
Bike summary
-
-
Frame Aluminum -
Travel Front 75mm -
Fork Suntour NVX
-
Groupset Tourney -
Suspension Hardtail -
Drivetrain 3 × 7 -
Brakes Tektro MD Mechanical Disc
Parts list
Components
Main components, grouped by system.
Bike components
Frame
Frame
Size Specific Design 6061 aluminum with fast back rear triangle, 1 1/8” head tube, internal cable routing, chain stays disc brake mounts, 34.9mm seat tube, kickstand mount, replaceable derailleur hanger, fender/rack eyelets and ring lock mount eyelets.
Suspension Fork
SR/Suntour NVX-DS, aluminum lowers, coil spring, 28mm stanchions, 1-1/8” steerer, 75mm travel
Drivetrain
Rear Derailleur
Shimano TY300
Front Derailleur
TY510 top swing
Shift Levers
Shimano Rapid Fire SL-EF500, 2-speed
Cassette
Shimano CS-HG200, 7-speed, 12-32T
Crank
Forged alloy crank with chain guard, 48/38/28T, 170mm
Bottom Bracket
VP sealed cartridge, 68 x 122.5mm
Chain
KMC Z7
Pedals
Platform style
Wheels
Rims
Alex TD26 disc specific double wall alloy rims, 32H, alloy disc hubs with QR and 14g black electroplated spokes
Tires
CST Dual Sport Tire, 700 x 42c
Brakes
Brakes
Tektro MD-280 cable-actuated disc brakes with 160mm stainless 6-bolt rotors and Shimano EF41 levers
Cockpit
Stem
Jamis Trekking, 3D forged alloy, 15 ? rise, Length-60mm
Handlebar
Jamis Riser bar, double-butted aluminum, 25.4 x 10 ? sweep x 20mm rise x 640mm (14-18”), 660mm (20”)
Grips
ERGO Type Grip
Headset
Internal Cup, threadless, 1 1/8”
Seat
Saddle
NEW Jamis Touring Women’s with SL cover
Seatpost
Jamis alloy micro-adjust, 31.6 x 350mm alloy clamp with QR seatpin
Fit data
Geometry
Numbers for sizing and ride feel.
| Size | 14" | 18" | 20" |
|---|---|---|---|
| Stack Reach Ratio | 1.681 mm | 1.684 mm | 1.688 mm |
| Front Center | 624 mm | 624 mm | 620 mm |
| Rake | 40 mm | 40 mm | 40 mm |
| Trail | 90 mm | 88 mm | 81 mm |
| Stack | 632 mm | 640 mm | 648 mm |
| Reach | 376 mm | 380 mm | 384 mm |
| Top Tube Length | 557 mm | 557 mm | 570 mm |
| Seat Tube Angle | 73.5 ° | 74 ° | 73.5 ° |
| Seat Tube Length | 356 mm | 457 mm | 508 mm |
| Head Tube Angle | 70 ° | 70.5 ° | 71.5 ° |
| Head Tube Length | 125 mm | 131 mm | 135 mm |
| Chainstay Length | 440 mm | 440 mm | 440 mm |
| Wheelbase | 1057 mm | 1057 mm | 1053 mm |
| Bottom Bracket Drop | 60 mm | 60 mm | 60 mm |
| Standover Height | 641 mm | 664 mm | 662 mm |
| Wheels | 700 | 700 | 700 |