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Soma

Soma Fabrications, which gets its name from the San Francisco name of South of Market Street has become a favorite bike brand among those of us who want to build our own bike with high quality reasonably priced parts.

We love how Soma Steel frames ride. Rider after rider tell us how no matter how many higher end bikes they have in their garage, they always grab their Soma when they go out on their favorite rides.

We love their beautifully simple paint jobs, minimalist graphics, and more importantly the flexibility that their frames provide

We love them so much that we build up a number of Custom Soma Bikes that are high end commuter bikes, thoughtfully made touring bikes, cyclocross bikes and belt drive bikes that make our souls purr.

Soma Wolverine Gravelo 650b or 700c
$1,875.00 - $2,525.00
Think of the Wolverine Gravelo as an off-pavement randonneur, a 700c or 650b (your choice) 2 x 10 build that we've optimized for adventures far from pavement, where the deer and the antelope play in the middle of the road, just like you. There's a higher-level Gravelo, which we call the Powerplant build. It includes a Shutter Precision dynamo hub, a Busch & Mueller Luxos U front light that charges your phone or external battery, and a Busch & Mueller tail light (your choice depending on mounting position). If you do go with a dynamo hub, we suggest the 650b build in order to get current to your lights at lower speed. The Gravelo joins our other Soma Wolverine builds: the Daily Grinder city build and the Weltgrinder Rohloff touring build. We'll post pictures of the 650b build soon.

Other Popular House Builds include:

Check out our other killer Belt Drive Bikes too.

Soma Wolverine V2 gravel build 58cm
$1,899.00 $2,500.00 24% Savings
This is a one-off 58cm Soma Wolverine gravel build. As it's been a floor model for awhile, we've marked it down significantly. This is a new bike that comes with a full Soma frameset warranty. Can ship domestically for $85 (except AL and HI). No tax.
Soma Double Cross - Disc (Complete Bicycle)
$1,551.15
Look up ‘do-all’ bike in the dictionary and you'll find a picture of the Soma Double Cross Disc. The heat-treated chromoly frame is more than ready for 'cross, trail-riding, commuting, and even loaded touring. SRAM's Apex 10-speed groupset with generous gearing is perfect for the serious commuter, while the surefooted 32mm-wide tires provide ample traction through corners and smooth out any bumps you'll encounter along the way. Go ahead, say yes to adventure and take the road less traveled with this versatile machine.
Soma Wolverine 700c/650b V2 Frame
$275.00 - $646.00
Joe Bike has built up more Wolverines than any bike shop in the world, so throw us your ideas; we've probably already done it. There are now three fork options for the Wolverine, so we're now selling the frame separately from the fork. See Related Items. The original inspiration for the Wolverine was "monster cross", but it is seriously so much more. Its geometry is stable enough for off road touring, but sporty enough for all-around adventure. With its Tange/IRD Sliding Dropouts, you can turn it into a single-speed CX bike. With a split seatstay, it is compatible with the Gates Carbon Belt Drive. - Clearance for 700x45c tires w/fenders (applies to rear only--fork clearance depends on Wolverine fork and ranges from about 44mm max tire width for the carbon fork, to 44-45mm for the thru-axle steel fork, and about 51mm for the quick-release steel fork). -700c or 650b compatible - Rear hub spacing: 135mm - Gates Carbon belt-drive compatible - Rohloff compatible, and now Rohloff/Gates approved! The Wolverine can be built up any way you like, such as with a belt and internal gearing or a conventional drivetrain. Skinny tires, 650b,.singlespeed, internally geared, or conventional derailleur and chain. Drop bars or flat. This is the updated V 2 frame, which features a seatstay splitter (to get the belt in the frame), whereas in the original frame the split was at the dropout. The V2 offers Rohloff+Gates compatibility, whereas the older frame allowed either/or but not both. We're offering our own Wolverine complete builds optimized for city, gravel, or touring. We call them the Daily Grinder, the Gravelo, and the Weltgrinder Rohloff, respectively. Note that this frame will need to be prepped (faced, chased, T-9 sprayed, etc.). We charge $70 to prep frames bought from us (and $105 for frames not bought from us).

Helpful FAQ's

How does One Install a belt on the Second Generation (V2) of the Soma Wolverine Frame?
This version of the Wolverine Soma Frame (V2) comes with what's called a Split Seatstay Design. This allows you to easily install / replace a Gates Belt by unbolting the right seatstay and then sliding the belt through the gap. (see detail pic below)

Soma Wolverine V2 Split Seatstay detail photo

What are the best style of Brakes to use with the Soma Wolverine?
The best option are brakes that have 160mm rotors (for great stopping power) and that fit international standard mounts that are specced on the Wolverine.
I want to build up the Wolverine, wwhat are the specs I need in order to get the right components?
Front derailleur clamp: 28.6mm
Rear hub spacing: 135mm
Seatpost: 27.2mm
Seat Collar: 29.8mm to 30mm (NOT INCLUDED W FRAME)
Headset: 1-1/8" external cup (SHIS: EC34/28.6 | EC34/30)
Bottom Bracket Shell: 68mm wide, English Threaded
Brake Compatibility: 160mm rotors, International Standard Disc mounts
Chainstay length range: 425-440mm (Soma Fabrications strongly recommend you avoid placing wheel in the Very back of dropout- bad things happen)
Water bottle bosses: 2 sets of mounts
What is the recommended Carbon Drive Setup for the Soma Wolverine
For the Alfine 8 spd hub, we recommend 46t front, 24t rear, and 115 length belt, with the dropout set at 440mm from the center of the BB axle. We recommend the new Center-Track system. Please note: Shimano Alfine Di2 does not fit on the Wolverine due to the Di2's Belt line is not compatible with the Soma Wolverine.

For the Rohloff hubs (compatible with this Split-seatstay design): For a gravel Grinder setup we love setting it up with a 55t in Front x 19t in back with a 115 Belt; 440.19 chainstay setting is a great starting point. For touring or adventure /trail use, use a smaller front ring.

For Single Speed setups: 46t in front x 26t in back x 115 belt and set the chainstay to 435.19mm

We strongly recommend you use the Gates Drive Calculator to figure out your gearing - it is a real help. We recommend starting with 430mm as a chainstay length. This will help you get a useful belt length when you plug in your preferred f

Soma Fog Cutter frame
$489.00 - $554.00
Soma Fog Cutter Frame Endurance road disc frame that can fit tires up to 700x40mm. - Fully heat-treated Tange Prestige CrMo steel - Road sport geometry - Rear rack & fender mounts - International disc mounts (rear mount is located on the chainstay for stiffer performance and also keeps the caliper out of the way of rear racks) - Available matching straight blade carbon fork (order 23316/43mm for frames 54cm and up; order 23317/48mm rake for frame 48-51cm - 1-1/8" size headtube - 27.2mm post size - 6 sizes: 48, 51, 54, 56, 58, 61cm - Rosso Red PLEASE ALLOW US 3-5 BUSINESS DAYS TO SHIP. Want a complete Fog Cutter? Check out our "Pinchot" House gravel build.
Soma B-Side 27.5-inch (650b) Frame
$489.99
Soma's B-Side mountain frame sports cutting-edge 27.5" (or 650b) tires, which are halfway in between the more common 26" and 29" MTB tires. 650b tires roll over obstacles better and are more stable at speed than a 26" wheel and are lighter weight than 29er wheels. 27.5" bikes also have less of the unwieldy feel that 29ers are known for. Soma's 3rd generation B-Side has a slightly slacker geometry. Still great for XC trail riding, but more controllable when things get fast. Snazzy Tange/IRD Sliding Dropouts allow you to go single-speed or geared. - Tange/IRD Sliding Dropouts allows geared and single-speed builds with easy wheel removal - Designed to accommodate a 100/120mm travel fork (69 degree head angle with 100mm fork, 68 degree head angle with 120mm fork)
Soma Grand Randonneur 650b - Frameset
$489.99
Soma's Grand Randonneur is a true low trail geometry randonneuring frame set, which means it rides better with a front load than other touring and road bikes. Co-designed with Mike Kone of Rene Herse/Boulder Bicycles. It will fit all the gadgets a good rando bike should have. The traditional diameter tubes lend a smooth comfortable ride. They have tweaked the geometry for 2015. We increased frame stack by 15-20mm. Seat tube extension has been reduced. - Designed for 650b wheels and cantilever brakes - Max. tire fit: 650 x 42mm slick tires w/fenders - Max. fender width: 50mm
Soma Juice 29er Frame
$489.99
Soma juice in old Hindu scripture is an intoxicating drink, a drink of the gods. And since its introduction, Soma's Juice has intoxicated many new riders into loving fast-rolling, rock-garden slaying 29er wheels. The CrMo Steel tubes offer a lively ride. The geometry is very stable at speed and lets you carve corners with confidence. Tons of fun. - Geometry designed to accommodate a 100-140mm travel fork - Tange Stainless Steel Sliding Dropouts for geared or single speed set-ups - S-bend seatstays and chainstays
Soma Double Cross Disc Frame
$449.99
Soma's Double Cross Disc Frame is a great do-all frame. Ready for cross, trail-riding, commuting and loaded touring. The Double Cross Disc is disc-specific. Don't worry about finding the right fit, it comes in a wide range of sizes to fit you right -- up to 66cm! - Clearance for 700x41c tires w/o fenders - Rear hub spacing is 135mm
Soma Smoothie Road Frame
$429.99
Soma's Smoothie road race frame is agile and responsive. Excellent for stage races and competitive club rides. But also comfortable enough for daily commutes and charity rides. The semi-compact geometry allows for more standover clearance and fitting options, but they don't cheat you by only offering 4 sizes. - Based on modern road geometry, the Smoothie is speedy and nimble - Tange Prestige heat-treated butted CrMo steel; butted CrMo rear end - Rear rack and fender mounts - Compact-style geometry
Soma Fog Cutter Fork, carbon disc
$249.99
Soma Carbon Fork for Fog Cutter. Same maroon paint. Straight-blade carbon fork for the Soma Fog Cutter frame. Choose the 43mm rake version for frame sizes 54-61. Choose the 48mm rake version for frame sizes 48-51. - IS disc mount - 400mm axle to crown - 43mm or 48mm rake - 1-1/8" alloy steerer (300mm long) - 45mm max tire width - Weight: 775g - Does not have mid-blade mounts
Soma Tradesman Cargo Wheelset
$209.93
- Specifically built to match and work with the Soma Tradesman Cargo frameset with a disc 20" front wheel and 26" rear wheel - Matching 20" and 26" double wall Soma rims - Soma 6 bolt IS disc hubs for quality and reliability - Use with the Soma Tradesman frameset: SF-3685
Soma Porteur Front Cargo Rack
$200.00
- Full chromoly construction specifically designed for 700c bicycles - Mounts to hub axle for universal fitment - Adjustable height with lower horizontal strut for fitment of a small bag or pannier - Deck provides ample cargo space at 14.25"X12" - Optional stylish fence available separately
Soma ES Road Fork
$189.90
• ES road fork made with Tange Chromoly and designed to match the ES road sport frames • Requires 57mm long reach brakes • Available with 43mm or 45mm rake (offset)
Soma 29
$185.90
- Tange Infinity CrMo steel fork for 29" or 27.5" (650B) MTB wheels - Suspension corrected for 100mm-travel 29er frames or 120-130mm 650B frames - Unicrown with straight D-shaped blades, International Standard disc mounts - 1-1/8" threadless CrMo steerer, 47mm rake
Soma Battleaxe 26
$185.90
- 26" FatBike or 29" Plus straight blade fork, designed to work with 100mm suspension corrected 29er geometry (such as the Soma Juice) - A stout fork constructed from Tange Infinity CrMo tubing, built with bikepacking in mind. More front rack braze-ons than you can shake a stick at - Clearance for 26"x5.0" or 29"x3.8" tire - 135mm rear disc spacing - 300mm steerer (uncut), accepts 30.0mm crown race, 47mm rake - Brake mount: IS disc
Soma Chrome Lugged Track Fork - Threadless
$185.90
- Chrome lugged crown with Tange CrMo legs/steerer - 41mm rake - Axle-crown: 365mm - Brake mount: caliper - Steerer: straight - Wheel (legs): 700c (curved)
Soma Chrome Lugged Track Fork - Threaded
$169.90
- Chrome lugged crown with Tange CrMo legs/steerer - 41mm rake - Axle-crown: 365mm - Brake mount: caliper - Steerer: straight - Wheel (legs): 700c (curved)
Soma Hellyer Track Cranks
$169.90
- Strong and quite raceable polished cold forged 6061 aluminum track crank with a 144 BCD spider - Includes 46t 1/8" CNC 7075 aluminum chainring - *JIS bottom bracket sold separately - 650g (including chainring) - BCD: 144mm - Spindle interface: JIS
Soma Smoothie Road Fork
$169.90
- Smoothie road fork is design to match the Smoothie frames - Tange CrMo construction - 49mm reach brakes - Wheel (rake): 700c (43mm) - Steerer: straight (28.6/30.0) - Axle-crown: 365mm - Brake mount: caliper
Soma Lugged Cross Fork
$165.90
- Lugged Cross fork to match the Double Cross Cyclocross frames - Lugged crown with Tange CrMo construction - Features eyelets for front rack and braze-ons for low-rider panniers - 44mm rake - Brake mount: cantilever
Soma Lugged Curved Cross Fork - Disc
$165.90
- Lugged Cross fork to match the Double Cross Cyclocross frames - Lugged crown with Tange CrMo construction - Features eyelets for front rack and braze-ons for low-rider panniers - 44mm rake - Brake mount: IS disc
Soma 27.5
$145.90
- Specific 27.5" (650B) MTB fork with CrMo blades - Disc brake compatible suspension corrected with fork tip eyelets - 300mm steerer (uncut), 30.0mm race, 40mm curved-sweep rake
Soma Oxford Pedals
$99.90
• Large platform sculpted for good cornering clearance that won't bite into leather soled shoes like BMX and cage platform pedals • CNC'd machined aluminum (100x80mm platform), high polished finish • Sealed cartridge bearings and toe clip compatible
Soma Lauterwasser Bar
$59.90 - $79.90
- Inspired by shallow drop bars produced by Jack Lauterwasser an Olympian cyclist from the 1930's - A great mix of comfort and unique style - Choose aluminum or chrome-plated Tange steel - Clamp: 25.4mm - Width: 480mm - Drop: 93mm
Soma Cazadero 27.5
$77.90
- A mixed terrain tire for a new era of riding, gravel, dirt, asphalt - Features a raised center for fast rolling on asphalt, with specially designed side knobs that corner well on dirt and maintain traction on the street - Hard to find 42c size bridges CX and MTB riding - A excellent choice for the Soma Grand Randonneur, Soma ES (650B conversion), Soma San Marcos or New Albion Homebrew - Made in Japan - Folding bead - Weight 455g
Soma Eagle Bar
$77.90
- Multi-position three piece welded Chromoly bar with chrome plating - 455mm wide (at welds) - Clamp diamater: 31.8mm - Rise: 0.39" (10mm) - Width: 25.6" (650mm) c-c
Soma Kyudo Saddle
$77.90
- Classic Full profile with a Slightly Raised back - Synthetic leather or Micro-suede Cover with firm padding - Weight: 299g
Soma Ensho Saddle
$55.90 - $69.90
• Featuring superlight padding and a sleek classic form • Features minimal graphics in a variety of colors. Choose standard colors: SF-225* or electric colors: SF-226*
Soma Kamisori Saddle
$57.90 - $69.90
• Featuring superlight padding and a modern low-profile form • Flat top for good sit-bone support with comfort vent to reduce perineal pressure • Available in two colors with minimal graphics
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