Titanium 420

Suspension Corrected 29er / 650B Trail bike

With the advent of 29er and 650B hardtails like the Kona Honzo and the Canfield Nimble Nine, the Ti 420 represents the culmination of the short-chainstay frame style. 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 12x142mm thru axle with 74mm post mounts to silver Rohloff-specific with 51mm disc tabs.

Want to try 650B? No problem! The 420 can handle 650B wheels with a nominal .75″ drop in bottom bracket height.

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.

We have watched the gradual metamorphosis of XC to trail with interest, and our 420 kit exemplifies the market’s shift toward wide rims, tubeless and high-volume tires, short stems and wide bars, and generally more durable componentry. We’ve spec’d a handful of our favorite mountain bike components on this build. Want to try 650B? No problem! The 420 can accommodate this easily as our stock wheel and tire components are all available in both 29″ and 650B.

  • Suspension specific for 80-120mm 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)
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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