Yaupon Steel or Titanium Mountain Bike - ATB

The Yaupon in MTB Bar mode is very well balanced and extremely comfortable. The 68º head tube angle provides consistent handling up front and the lower bottom bracket keeps everything nice and stable. It is very easy to shift your body weight around the bike to pick through challenging terrain. Compared to our Sendero the Yaupon’s geometry is more relaxed. It is well suited to long rides, soaking in the moment and bikepacking. We like it best with a nice wide handlebar with some sweep to it. The Yaupon Steel and Yaupon Titanium represent our thoughts on what makes the most comfortable all day bikepacking bike that can still shred on any trail ride.

We always say the best bikepacking bikes are the ones you reach for on any given trail ride. The Yaupon is about making big possibilities into reality as an ultra-endurance bikepacking bike, trail ready mountain bike, or a suspension-fork gravel bike. An adaptable geometry designed for dirt drop handlebars or mountain handlebars and broad component compatibility will leave you enjoying this All-Terrain Bike on everything from singletrack to multi-day bikepacking or a long gravel grind.

    • The Yaupon steel is at home tackling technical trails, but foremost it’s meant for the longest rides in the most comfortable and fun way possible!

    • A slack 68º head tube finds the flow in rough terrain.

    • A steep seat tube angle and other geo numbers combine to keep the front end planted under difficult climbs.

    • A balanced bottom bracket is positioned to bring out the rest of the geometry and plant the bike in corners whether seated or floating.

    • The bike is spirited out of the saddle and rather huckable, but the comfort of the design allows for a long day seated.

    • The wheelbase offers great maneuverability picking lines on the trail and threading through tight corners.

    • Smooth and predictable compliance from Chumba Oversized Select Double Butted Tubing, built of the best tubing available.

    • Made in USA quality, handmade to order.

    • Seat-stays are custom diameter to each frame size for the smoothest ride.

    • Chumba Oversized Select Double Butted Tubing and PMW stainless steel sliding dropouts, mean this bike will exceed your expectations and provide years of reliable trail service. Oversized tubing yields larger tube miters for strength.

    • Clean thoughtful cable routing w/ stainless steel braze-ons. Including stainless top tube bag mounts & cargo cage mounts under down tube.

    • Flawless frame miters, all tubes are heat sunk and argon purged when welded to prevent distortion and material thinning.

    • Machined head tube for tapered or straight forks.

    • Many frame customizations are available.

  • Now available in two tubesets! Our Chumba Oversized Select Double Butted Tubeset has always been trusted for trail riding, bikepacking. Prized for its value, dent resistance & balance of compliance/strength.

    For those looking for a more race performance tubeset we offer a Velospec Heat Treated (USA made) Tubeset. Available in the frame customizations as an add-on. For lighter frame weight and increased performance characteristics. The tubing is air hardened at weld zones which increases its fatigue strength and resistance to external forces. While heat treatment adds strength, these tubes offer increased elongation % for a compliant ride. The stuff of magic? We think so.

  • The Yaupon steel is designed to be extremely compatible with a wide range of tire sizes, hub options and fork lengths. Frames come with dropout inserts, rear axle and seatpost clamp.

    • Fork Travel: Optimized for 120mm travel w/ 44mm offset and rigid forks 483mm-490mm axle to crown (A2C)

    • Best 120mm suspensions forks: Fox Stepcast 34 120 or Standard 34 120, Rockshox SID 120 or Pike 120

    • Best 100mm suspension forks: Fox Stepcast 34 100mm

    • Best rigid fork: Enve MTN Boost Carbon

    • Suggested Stem Lengths: 35 - 80mm

    • Headset S.H.I.S.: ZS44 Upper/ EC44 Lower for 1.5” Tapered or 1 1/8” Straight Forks

    • Hub Spacing: 148x12 Boost

    • Drivetrain / PMW Sliding Dropout Options: Geared, SRAM Transmission, Single Speed or Rohloff

    • Rear Axle: 148x12x1.5 thread pitch (170mm total length) (comes with frame)

    • Bottom Bracket: T47 73mm Threaded External. (note: if ordered before July 2024 then 73 English Threaded BSA)

    • Chainring/Chain-line: 1x 38T on Boost chain-line (51/52mm)

    • Seat Post: Post 31.6mm or for 27.2mm use a Cane Creek Alloy Shim

    • Seat Post Clamp: 35mm (comes w/ frame)

    • Dropper Port: Stainless internal dropper port on non-driveside w/ rubber housing guide

    • Cable Routing: Standard cable routing goes under the down tube via PMW bolt on cable guides and then onto the chain-stays

    • H20 Capacity: 3 bottles on all sizes.

    • Cargo Mounts: Includes Top Tube mounts and under down tube cargo mounts for 3 bolt style cages

    • Framebag mounts: Downtube comes ready for velcro free mounting, additional mounts are optional

    • Rack mounts: Optional customization to add mounts

    Max Tire Clearances:

    • 29 x 2.4” (in all dropout positions M, L, XL, mid-rearward on size small)

    • 29 x 2.6” (mid dropout and rearward)

    • 27plus x 2.8” mid and rearward

Yaupon Titanium - Frame, Frame & Fork or Custom Build Deposit
from $3,995.00
Yaupon Steel - Frame, Frame & Fork or Custom Build Deposit
from $1,695.00
“All of our complete bikes are built with a custom selection of components. We pride ourselves on listening, understanding your riding goals & working with you to craft the perfect blend of components & customizations.”
— Chumba USA | support@chumbausa.com

Yaupon Steel Geometry Chart in 6 Sizes S - XL

With a 120mm Fork

Measurement S M M/L L L/XL XL
Suggested Rider <5'6" 5'7" - 5'9" 5'9"- 5'10" 5'11"- 6' 6' - 6'1" 6'2>
Suggested Stem Length w/MTB Bar 32-60 40-70 40-70 50-80 50-80 65-90
Suggested Stem Length w/Drop Bar 32-50 32-50 32-50 32-50 32-60 32-70
Effective Top Tube 575 600 610 620 630 640
Head Tube Angle 68° 68° 68° 68° 68° 68°
Head Tube Length 95 110 115 120 130 140
Seat Tube Angle 74° 73.5° 73.5° 73.5° 73.5° 73.5°
Seat Tube Length 15" 16.25" 16.25" 18.25" 18.25" 20.25"
Chainstay Length 440-460 440-460 440-460 440-460 440-460 440-460
Bottom Bracket Drop 60 60 60 60 60 60
Wheelbase 1106-1126 1126-1146 1136-1156 1147-1167 1158-1178 1169-1189
Standover Height 28.8" 29.8" 29.8" 31.3" 31.4" 32.9"
Reach 391 406 414 423 431 438
Stack 632 646 651 656 665 674
Max Seatpost Insertion

With a Rigid ENVE MTN Fork

Measurement S M M/L L L/XL XL
Suggested Rider <5'6" 5'7" - 5'9" 5'9"- 5'10" 5'11"- 6' 6' - 6'1" 6'2>
Suggested Stem Length w/MTB Bar 32-60 40-70 40-70 50-80 50-80 65-90
Suggested Stem Length w/Drop Bar 32-50 32-50 32-50 32-50 32-60 32-70
Effective Top Tube 570 594 604 614 625 634
Head Tube Angle 69.9° 69.9° 69.9° 69.9° 69.9° 69.9°
Head Tube Length 95 110 115 120 130 140
Seat Tube Angle 76° 75.4° 75.4° 75.4° 75.4° 75.4°
Seat Tube Length 15" 16.25" 16.25" 18.25" 18.25" 20.25"
Chainstay Length 440-460 440-460 440-460 440-460 440-460 440-460
Bottom Bracket Drop 74 74 74 74 74 74
Wheelbase 1092-1112 1112-1132 1122-1142 1133-1153 1144-1166 1155-1175
Standover Height 27.8" 28.8" 28.8" 30.4" 30.5" 32.5"
Reach 413 428 436 444 452 459
Stack 619 632 637 641 651 660
Max Seatpost Insertion

Axle to Crown (A2C) Fork Measurements

  • Fox 34 Stepcast 29er fork, 44mm Offset, 530mm Axle to Crown

  • ENVE MTN Boost 29er fork, 44mm offset, 490mm Axle to Crown

Standover/Effective Seat Tube Angle

  • Standover is measured 90mm forward of the bottom bracket, using a 29x2.25 tire for reference.

  • Effective seat tube angle is calculated from average saddle heights and placements per size.

  • The range is roughly 1º in either direction of the effective angle based on your chosen saddle placement.

Yaupon, pronounced (yo-pawn) or (yaa-pn) is a type of evergreen holly tree found throughout the Southeastern US. It is one of only 2 endemic North American plants that can be used as a caffeine source. It also is a burly hill here in Austin, TX where once crested you can enter into one of the most challenging trail systems named Thumper.

Ordering

The Yaupon Steel 29er / 27plus is available as a frame only, frame set, in complete build kits, and partial builds. Custom component configurations can be quoted on request here: Chumba Custom

You can order a Yaupon direct from Chumba over the website using the drop-downs on this page, over the phone, in person @ our Headquarters or from an approved Chumba Dealer. We welcome calls (512) 494-4944 and emails for immediate questions.