Ritchey Ultra Mountain Frameset - 29"/27.5" Steel Honey Mustard SmallRitchey Ultra Mountain Frameset 29" 27. 5" Steel Honey Mustard Small. The Ritchey Ultra Frame is designed around a 120mm travel fork and super stable Boost 148 spacing. Designed to accommodate 29" or 27. 5" wheels the Ultra is highly versatile. Throw on some 29s for some trail smashing XC riding or saddle up some 27. 5+ for some serious no holds barred shredding. Compatible with 27. 5 x 2. 8" and 29 x 2. 4" tires Internal routing for a dropper post