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Ritchey P-650B Mountain Frame (Light Blue) (17")

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This is the second version of a 650b mountain bike from Ritchey Tom started to design his first in 1977. Even back then, Tom had a feeling that there was an advantage to the "middle" wheel size, but it took the rest of the cycling world three decades to figure it out: a 650b (or 27.5") wheel provides the bump-eating smoothness of a 29er, with the light, responsive feel of 26" wheels. Finally, the era of the 650b wheel is here.

The P-650b is a close relative to the P-29er. Up front there's the proprietary forged-and-machined, gram-shaving integrated head tube featured on all new Ritchey frames. Forged socket dropouts nd new chainstay-mounted rear disc brake mount save a few more grams.

And like every frame we make, geometry and tubing is carefully fine-tuned by Tom, to bring the legendary balanced, nimble Ritchey feel to 27.5" wheels.


  • Ritchey forged-and-machined 1.5 tapered head tube
  • Clearance for up to 2.25 tires

S (15"), M (17"), L (19"), XL (21")
(See geometry chart below)
Weight: 2,028g for frame (L/17")
Fork: Designed for use with 100mm travel forks
Headset: Integrated 1.5" tapered
Upper bearing: 41.8mm OD / IS42/28.6 (S.H.I.S.)
Lower bearing: 52mm OD / IS52/40 (S.H.I.S.)
Bottom Bracket: 68mm English threaded
Rear spacing: 10x135
Front derailleur: 28.6 low clamp top or dual pull
Weight: 2178g / 4.8 lbs (M/17", frame only)
Sold as frame only.

This product was added to our catalog on March 7, 2018