Trail hardtail / off-road endurance frame, designed for riders who want a stable and robust platform for trails, long rides, and custom builds with a 120 mm fork. The Ultra has a more trail-oriented character than the P-29er and a more dynamic feel than the Ascent, but it is not intended for expedition use or heavy bikepacking.
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Ritchey Ultra Frame
The Ritchey Ultra is a steel hardtail frame designed for trail and real-world off-road endurance riding, where stability, reliability and control are essential. It is a modern yet coherent platform, built around a 120 mm fork, compatible with both 27.5” and 29” wheels, and supporting either 1x or 2x drivetrains while keeping a clean, functional layout.
The Ultra is conceived as a versatile hardtail for riders who want a solid, predictable bike for long rides, varied terrain and custom builds, without chasing short-lived trends.
Construction highlights
WCS Logic Tubing The frame is built using Ritchey’s proprietary WCS Logic steel tubing, triple-butted and heat-treated, developed specifically for the TIG welding process to Tom Ritchey’s specifications. This construction focuses on long-term durability, structural integrity and consistent ride quality—key attributes for a trail-oriented steel hardtail.
Technical specifications
FRAME
Item
Specification
Material
Heat-treated, triple-butted Ritchey Logic steel
Construction
TIG welded
Head tube
Ultra-light forged and machined tapered head tube
Treatment
ED Coat (Electrophoretic Deposition) for corrosion resistance
Headset
Ritchey WCS included (upper IS42/28.6 – lower IS52/40)
Upper bearing
41.8 mm OD / IS42/28.6 (S.H.I.S.)
Lower bearing
51.9 mm OD / IS52/40 (S.H.I.S.)
Seat clamp diameter
33.1 mm (2.5 Nm max for derailleur clamps and chain guides)
Seatpost diameter
30.9 mm with stealth dropper routing
Seat collar
Replaceable
Bottom bracket
BSA 73 mm – English threaded
Drivetrain
1x or 2x
Max chainring size
38T single – 26/36T double
2x note
Shimano Side Swing front derailleur required (11-speed only)
Chainline
52 mm
Direct Mount compatibility
Not compatible (including T-Type derailleurs and cassettes)
Bottle cage mounts
Two (downtube + seat tube) *size S: downtube only
Rear spacing
BOOST 148 mm
Rear axle
12 mm alloy thru-axle included
Cable routing
External
Derailleur hanger
Replaceable stainless steel
FORK
Item
Specification
Recommended fork
120 mm BOOST suspension fork
Rigid alternative
500 mm axle-to-crown rigid fork
WHEEL & TIRE COMPATIBILITY
Item
Specification
27.5"
27.5x2.4 recommended (2.8 max)
29"
29x2.25 recommended (2.4 max)
Note
Actual tyre size varies by rim and tyre manufacturer
BRAKE COMPATIBILITY
Item
Specification
Standard
Rear post-mount
Rotor size
160 mm
Max rotor
180 mm with adaptor (sold separately)
DETAILS
Item
Specification
Sizes
S (15") / M (17") / L (19") / XL (20.5")
Weight
2,380 g (size M / 17")
Colour
Honey Mustard
Size guide (manufacturer reference)
The following sizing is provided by Ritchey and should be considered a general guideline. Final size choice depends on individual proportions, riding style and intended use.
S: 157–170 cm
M: 168–178 cm
L: 175–186 cm
XL: 183–191 cm
At Bikejamming we offer dedicated sizing and build consultation. Share your height and inseam and we will reply within 24 hours.
Questions and Answers about the Ritchey Ultra
What’s the difference compared to the P-29er?
The Ultra is more trail-oriented: it’s designed around a 120 mm fork, offers more capability on rough terrain, and allows for a wider range of setups.
Is it an adventure frame?
In a broad sense: it can handle long rides and remote conditions, especially in light and dynamic setups.
Can I run 27.5 or 29 wheels?
Yes, it supports both, with different setup approaches.
What tire clearance does it support?
Up to 27.5×2.8 or 29×2.4 max.
Is 1x or 2x better?
Both are possible, but 2x requires Shimano Side Swing and is limited to 11-speed only.
Is it suitable for long-distance travel?
It works for light, self-supported trips, although it is not a dedicated travel-focused frame.
Spare parts, headsets and build support
With frame purchase we provide access to:
original Ritchey spare parts
compatible Ritchey headsets
support for fork choice, drivetrain compatibility and full build planning
Why buy from Bikejamming
Tracked shipping
Bilingual support (Italian / English)
Fast, clear responses
Real pre-purchase consultation on sizing and setup
If you would like to check compatibility or plan a build that truly matches your riding style, we are here to help.
Iconic routes & real-world use
This frameset can be configured for long, vibration-heavy off-road routes. For a detailed explanation of bike choice criteria on a real-world route, see our guide: Baja Divide: which bike to choose
Brand
Reference
97452007028
Condition
New
UPC
796941974554
Frame
Adventure MTB
Wheel Size
27.5/29''
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