Soma Fabrications Riff Hardtail Frame 27.5″ / 650b

The Riff is the Soma hardtail frame for 27.5″/650b wheels.

It replaces the B-Side model.
The debate of what to call the middle size MTB tire is long over.
650B lost out to 27.5”.
So Soma has decided with this major overhaul of their ‘B’-Side, to retire the name altogether.

While the B-Side showed Soma’s tendency of not following the latest trends, the Riff is pretty modern in geometry and features.
Tough Broski Sliding Dropouts allow you to go single-speed or geared or even run hub gears.
Also new is internal seat tube dropper post routing.
A modified chainstay allows fitting even some double cranks with “plus size” 2.8″ wide tires without needing to invest in Boost parts.

With the music-themed name, Soma chose Pelham Blue (a distinct retro color used on Gibson guitars) to launch the Riff

FEATURES:
+ More modern geometry
+ IRD Broski Sliding Dropouts – allows geared and single-speed builds with easy wheel removal
+ Fits a 31.6mm seat post to open up more dropper options It retains all of its cooler features
+ Fits 27.5 x 2.8” without requiring Boost components
• Tange Prestige CrMo steel
+ 44mm headtube works with either 1-1/8” straight forks or tapered forks (with the correct headset)
+ Tange Prestige heat-treated butted CrMo steel; butted CrMo rear end
+ Geometry is optimized for 100mm travel 27.5″ forks and will handle 120mm forks great too
+ Disc brakes only (ISO tabs)
+ S-bend seatstays and chainstays
+ Rear rack and fender eyelets
+ Rommended tire size: 27.5 x 1.95″ – 2.8”
+ Weight: 5.35 lbs
+ 31.6mm post size/31.8mm frt. der. size/34.9mm seat collar, 73mm bottom bracket (English threads); 400mm+ post recommended
+ 35mm spacing for traditional QR hubs. Old school, yes, but upgradable to 142 x 12mm Thru-Axle with new inserts.
+ Rec+ CNC-machined 44mm headtube: Will take 1-1/8″ steerers with a ZeroStack 44 headset or tapered steerers with a ZS44 upper assembly and external cup (EC44) lower assembly

Based on non-specific 27.5 (650b) x 2.1 tire and fork length of 485mm (sagged)

OPTIONAL FORK:
The Soma ThruAxle MTB Fork is ideal for 29er frames made for 100mm travel forks or 27.5er frames made for 120mm travel forks.
+ Tange Infinity CrMo
+ 485mm axle to crown
+ Tapered steerer
+ 15mm thru-axle
+ Mini rack mounts
+ Fender mounts