Titanium 420

Adaptable Trail Hardtail for 29" or 27.5" Wheels

The Ti 420 is our all-purpose trail frame, capitalizing on short chainstays and designed with more versatility than any other similar frame. Ti softens the blows and drops the weight, while 420mm chainstays ensure snappy handling. Paragon Machine Works sliding dropout inserts allow for any combination of brake mounts, axle types and gearing you can think of, from black anodized thru axle with 74mm post mounts to silver Rohloff-specific with 51mm disc tabs.

Want to try 650B? No problem! The 420 has a slightly higher-than-average bottom bracket height, allowing it to handle 650B wheels without bringing the bottom bracket height too low. Most 27.5+ combinations work as well, although trial-and-error is the name of the game.

Normally, chainstays this short force a bend in the seattube, eliminating the ability to use a clamp-on front derailleur. They also reduce crank and tire clearance, a big no-no for all-mountain riding. With the use of a CNC’d plate on the chainstay, the 420 can afford the crank clearance for a triple crank, and the frame will accept a direct mount front derailleur.

  • Suspension specific for 80-140mm travel fork
  • 73mm bottom bracket shell
  • 31.6 mm seatpost size
  • 34.9mm seat tube
  • High Direct Mount front derailleur
  • 3/2.5 Titanium, with a CNC’d chainstay plate for crank clearance
  • Tapered, ZS44/ZS56 1.125″ to 1.5″ headtube
  • Aluminum sliding dropout inserts, affording a mere 420mm chainstay length
  • Choice of SS or geared, with direct-mount front derailleur
  • The 420 can be also set up as a 650B bike, with a BB height of 12.24″ (based on 650B x 2.35″ tires)
  • Belt Drive Compatible



We build our Ti 420 frames in 1” increments all the way up to 24″. Just scroll to the right so see specs for our larger frames

Size 14 15 16 17 18 19 20 21 22 23 24
Seat Tube C-TT 14in 15in 16in 17in 18in 19in 20in 21in 22in 23in 24in
Effective TT 21.5in 22in 22.5in 23in 23.5in 24in 24.5in 25in 25.5in 26in 26.5in
Head Tube Length 100mm 100mm 100mm 100mm 100mm 100mm 110mm 140mm 140mm 140mm 140mm
BB Drop 52mm 52mm 52mm 52mm 52mm 52mm 52mm 52mm 52mm 52mm 52mm
Head Tube Angle (w/ 120mm travel fork) 69° 69° 69° 69° 69° 69° 69° 69° 69° 69° 69°
Stack 576mm 576mm 576mm 576mm 576mm 586mm 586mm 614mm 614mm 614mm 614mm
Reach 388mm 389mm 401mm 412mm 434mm 437mm 449mm 453mm 466mm 479mm 475mm
Chainstay Length Sliding dropouts have a chainstay length range of 415mm—435mm
  • Geometry table is based on a 470mm axle-to-crown fork with 45mm offset, and a wheel diameter of 736mm
  • Seat tube length is measured from the center of the bottom bracket to the top of the top tube.
  • Seat tube lengths of frames with internal dropper routing are measured C-T