Build Skinny, Ride Fat Raffle

Update: Raffle party date: May 30th starting at 5pm at Bike Surgeon in Shiloh, Illinois!

The spring 2015 trail building season is upon us and GORC wants to reward those who put in their time helping to build and maintain our region’s singletrack. GORC and Bike Surgeon have teamed up to offer an amazing prize, a 2015 Specialized Fatboy fat bike valued at $2,100. A Fatboy demo bike will be on hand at a few of our trail building days so you can check it out in person and ride it.

How To Earn An Entry / Raffle Details

  • The Build Skinny, Ride Fat raffle is tied to the GORC 2015 spring trail building schedule. Raffle starts January 24th at SIUE and ends after the Rock Hollow trail build May 2nd, 2015. Raffle party date: May 30th starting at 5pm at Bike Surgeon in Shiloh, Illinois!
  • To Earn a raffle entry you must be a current paid member either at the individual, family or lifetime level AND attend any spring 2015 trail building event or Monthly Social.
  • You must sign our attendance sheet at each event you attend to receive an entry.
  • Trail Building Event = 2 entries, monthly social = 1 entry.
  • For each event you attend you will receive an entry.
  • Bike Surgeon in Shiloh, Illinois is donating this amazing raffle prize.
  • Winner will be announced at a raffle party being held at Bike Surgeon. Raffle party date: May 30th starting at 5pm at Bike Surgeon in Shiloh, Illinois!
  • The winner will pick their frame size between S-XL. The color is Satin Army Green.
  • The 2015 Specialized Fatboy bike retails at the value of $2,100 and is not redeemable as cash or credit.
  • The bike will be registered as new, and comes with all warrantees and service package from Bike Surgeon.
  • A demo bike will be available at some of the trail building events. Check back on each trailbuilding event page to see if the demo will be available.

2015 Specialized Fatboy

All the fun of a fat bike with the performance of a Specialized. The Fatboy combines a lightweight frame and fork with 4.6″ Ground Control tires to create a geometry similar to Specialized 29er geometry for nimble handling in the most extreme conditions.

  • Fully butted M4 Premium Aluminum frame w/ up to 5-inch tire clearance is lightweight and stiff
  • Specialized FACT carbon fork w/ 5-inch tire clearance for stiff handling
  • Fat 26″ disc, alloy single wall rims are designed to handle even the worst terrain
  • Specialized Ground Control Fat 26×4.6″ tires roll over anything
  • Custom 2×10, forged alloy crankarm, w/ 100mm spindle for put the power down
  • Tektro Gemini, hydraulic disc brakes for reliable stopping power
  • SRAM X7, 10-speed, medium carbon cage derailleur for crisp and precise shifting


Technical Specifications

Specialized M4 Premium Aluminum, fully butted w/ smooth welds, tapered headtube, post-mount disc dropouts, 190mm rear hub spacing, replaceable alloy derailleur hanger
Specialized FACT carbon, full monocoque, tapered steerer, 135mm hub spacing
1-1/8″ upper, 1-1/2″ lower, Campy style, integrated sealed cartridge bearings, split crown race, 3.8mm cone spacer
Specialized, 3D forged alloy, 4-bolt, 6-degree rise, anti-corrosion hardware
Specialized, low rise, double butted 6061 alloy, 9-degree backsweep, 5-degree upsweep, 15mm rise, 31.8mm
SRAM, S-Series Grip Shift, 92mm
Tektro Gemini, hydraulic disc, resin pads
Tektro Gemini, hydraulic disc, resin pads
Tektro Gemini, hydraulic
SRAM X7, 2×10, low direct mount
SRAM X7 Type 2, 10-speed, medium cage
SRAM S-Series, Grip Shift, 10-speed
Sunrace, 10-speed, 11-36
KMC X10L, 10-speed, reusable Missing Link
Custom Samox, 2×10, alloy, 100mm CNC spindle, w/ BB, 104/64mm BCD spider
Samox, PF30
Resin test ride, w/ toe clips, CEN std.
Specialized Fatboy SL, alloy disc, single wall, 90mm wide, sleeve joint, hookless design, 32h
Specialized MTB Hi Lo disc, alloy, sealed cartridge bearings, 135mm wide, QR, 32h
Stainless, 14g
Specialized Ground Control Fat, 120TPI, folding bead, 26×4.6″
Specialized Ground Control Fat, 120TPI, folding bead, 26×4.6″
Standard, presta valve
Body Geometry mountain, steel rails, 143mm
Alloy, 2-bolt, 12.5mm offset, 30.9mm, anti-corrosion hardware
Alloy, 34.9mm


Specifications subject to change without notice.


* *Not all sizes available in all markets

Size S M L XL
Seat Tube Length, Center to Top 394mm 445mm 483mm 533mm
Top Tube Length (Horizontal) 576mm 603mm 625mm 650mm
Chainstay Length 455mm 455mm 455mm 455mm
Bottom Bracket Drop 60mm 60mm 60mm 60mm
Bottom Bracket Height 315mm 315mm 315mm 315mm
Head Tube Length 110mm 120mm 135mm 150mm
Head Tube Angle 70.5° 70.5° 70.5° 70.5°
Seat Tube Angle (Actual) 73° 73° 73° 73°
Seat Tube Angle (Effective) 73° 73° 73° 73°
Wheel Base 1083mm 1105mm 1128mm 1154mm
Stack 590mm 600mm 615mm 629mm
Reach 395mm 420mm 437mm 458mm
Handle-Bar Width 750mm 750mm 750mm 750mm
Stem Length 60mm 60mm 70mm 70mm
Crank Length 170mm 175mm 175mm 175mm
Seat-Post Length 100mm 400mm 400mm 400mm
Standover Height 757mm 793mm 820mm 849mm