REEBdonkadonk Shred, Pinion Gearbox Reliability

We took the same proven REEBdonkadonk platform that’s been shredding ColoRADo snow packed singletrack for years and took it up a notch.  No more snow packed and frozen drivetrain.  No more chain lube.  Just perfect, reliable shifting with no hassle.

Pinion’s light, compact, and carefree gearbox is perfectly suited to the rigors of fat biking.  It’s sealed from the elements, works great in cold conditions, and can handle way more torque than your legs can dish out.  Throw in belt drive reliability from Gates Carbon Drive for the most maintenance free drivetrain available.  

The Pinion REEBdonkadonk frame uses our made in house, custom chainstay yoke for big tire clearance and the shortest possible chainstay length. The beefy 44mm headtube and 1 3/4“ downtube are paired with a 67 degree HT angle and 31.6mm seat tube to fit modern dropper seatposts.  Each and every frame is Barn Built, hand cut, hand welded, and hand powder coated in-house in Lyons, CO.

The build spec listed below is only an example of the possibilities.  We’ve built quite a few Pinion equipped REEBs and no two are the same.  If you like the build here, go ahead and click buy now below, you won’t regret it!  if you’d like something a little different, email with your component requests and we’ll work up a custom quote.

#REEBdonkadonk  #Fatbike

Frame lead time is currently 8-10 weeks.  Complete build lead time up to 26 weeks.


  • Updated Geometry makes the Pinion REEBdonkadonk even more fun in the steeps!
  • Air Hardening, Seamless, Heat Treated Steel, Handwelded in USA
  • Pinion Bridge can accept any Pinon gearbox (Pinion fat bike cranks and fat bike spider required)
  • 44mm ID head tube, compatible with 1-1/8” straight or 1.5″ tapered steerers
  • 31.6mm ø seat post
  • Internal dropper post routing
  • 12x177mm Rear through axle
  • Tire clearance for Maxxis Minion FBR, 26×4.8″
  • Paragon Machine Works sliding dropouts
  • Designed around the Manitou Mastodon, 120mm
  • Custom Powder Coat colors available at +$350 (Zinc Primer) – Email to add this option to your order
 Pinion Premium
FRAMEAir Hardening, Seamless, Heat Treated Steel, Handwelded in USA
FORKManitou Mastodon Pro EXT, 120mm
HEADSETChris King Inset 7
STEMIndustry Nine A35
HANDLEBARChromag Fubars OSX, 35mm
GRIPSErgon GS1 Single side twist
BRAKESHope Tech 3 E4
ROTORSHope, 180mm Fr, 160mm R
SEATPOSTOneUp Components V2
SADDLEErgon SM Enduro
WHEELSETHand Laced, Hope / Sun Ringle Mulefut 80 SL
HUBSHope Fatsno Pro 4
TIRESMaxxis Minion FBF & FBR, 26x2.8"
RIM STRIPSun Ringle Tubeless
VALVE STEMSSun Ringle Tubeless
REAR AXLE12x177mm
CrankPinion CNC'd Fat Bike Crank, 175mm
GearboxPinion C1.12, 12 speed
Front SprocketGates Carbon Drive CDX
BeltGates Carbon Drive CDX
SHIFTERPinion DS2.12, Rotary 12 speed

Generic Geometry Chart

All measurements valid w/ 120mm travel Manitou Mastodon fork
Changes in fork will result in changes to certain aspects of the geometry.

 SmallMediumLargeExtra Large
A. SEAT TUBE345mm (13.6")390mm (15.4")425mm (16.7")460mm (18.1")
B. EFFECTIVE TOP TUBE572mm (22.5")600mm (23.5")624mm (24.5")648mm (25.5")
C. REACH395mm (15.6")415mm (16.3")430mm (16.9")445mm (17.6")
D. STACK598mm (23.5")607mm (23.9")616mm (24.3")625mm (24.6")
E. SEAT TUBE ANGLE73.5°73.0°72.5°72°
F. HEAD TUBE ANGLE67.0°67.0°67.0°67.0°
G. CHAIN STAY460mm (18.1")460mm (18.1")460mm (18.1")460mm (18.1")
H. HEAD TUBE90mm (3.5")100mm (3.9")110mm (4.3")120mm (4.7")
I. AXLE TO CROWN551mm551mm551mm551mm
J. OFFSET51mm51mm51mm51mm
K. WHEELBASE1126mm (44.3")1151mm (45.3")1169mm (46.0")1188mm (46.8")
L. BB DROP56mm (2.2")56mm (2.2")56mm (2.2")56mm (2.2")
M. STANDOVER756mm (29.8")789mm (31.1")812mm (32.0")831mm (32.7")



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