Ritchey Ultra Hardtail MTB Frameset for XC & Enduro with Boost 148 Compatibility

The Ritchey Ultra Frameset is a masterclass in versatile, rugged design that meets the demands of both cross-country and enduro riders. Rooted in the expertise of Tom Ritchey, who first envisioned this frame in the 1980s, the Ultra has evolved while maintaining its signature ride characteristics. Whether you're tackling fast, technical XC trails or seeking aggressive all-mountain adventures, this frameset balances durability and performance with remarkable finesse.

Built around a 120mm travel fork and Boost 148 rear spacing, the Ultra is engineered for stability and adaptability. It accommodates both 29" and 27.5" wheels, offering riders the option to customize their setup for trail-smashing speed or no-holds-barred shredding. Its heat-treated, triple-butted Ritchey Logic steel tubing ensures strength without sacrificing weight, while the Electrophoretic Deposition (ED Coat) treatment provides excellent corrosion resistance for years of dependable use.

Attention to detail is evident in every component, from the ultra-light forged tapered head tube to the integrated 1.5” tapered headset, contributing to precise handling and responsiveness. Internal routing for dropper posts and compatibility with BOOST cranks enhance the frameset’s functionality and modern appeal. With its replaceable stainless-steel derailleur hanger and post-mount rear brake design supporting 160mm rotors, the Ultra is ready to perform under the most demanding conditions.

What It’s Good For

• Cross-country riders seeking a lightweight, stable frame capable of handling technical trails with speed.
• Enduro and all-mountain enthusiasts who want a durable, versatile platform for aggressive riding and descents.
• Riders who value frame adaptability, with compatibility for both 27.5 x 2.8 and 29 x 2.4 tires.
• Custom builds requiring modern features like Boost 148 spacing and internal dropper post routing.
• Those looking for a corrosion-resistant steel frame that balances classic ride quality with contemporary performance.

What It’s NOT Good For

• Riders wanting a full-suspension frame; the Ultra is designed as a hardtail only.
• Those who prefer bikes with suspension travel beyond 120mm, as the frame is optimized for 120mm forks.
• Individuals looking for frames compatible with non-Boost cranksets, since proper chainline requires BOOST cranks.
• Users needing integrated electronic shifting systems without additional adaptations.
• People who prioritize ultra-light carbon frames for racing weight savings over steel durability.

Frequently Asked Questions

What wheel sizes can I use with the Ritchey Ultra Frameset?
The frame is designed to accommodate both 29" and 27.5" wheels, allowing riders to choose based on their preferred riding style and terrain. It supports tire sizes up to 27.5 x 2.8 and 29 x 2.4, providing excellent versatility.

Is the frame compatible with dropper posts?
Yes, the Ritchey Ultra features internal routing specifically for dropper posts, enhancing rider control and comfort on varied terrain.

What type of brakes does the Ultra support?
The frame supports post-mount rear brakes with 160mm rotors, and it can accommodate up to 180mm rotors with the use of adaptors (sold separately).

What kind of bottom bracket does the frameset use?
The Ultra uses a 73mm English threaded bottom bracket shell, optimized for BOOST cranks to ensure proper chainline.

What sizes are available for this frameset?
The Ritchey Ultra is available in four sizes: S (15"), M (17"), L (19"), and XL (20.5"), catering to a wide range of rider heights and preferences.