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The Viral Bikes Skeptic is a radical departure from the norm, playing in a space that only few have ever dared. This play bike is built around a 150-160mm travel front fork, new Boost spacing rear triangle, and a Pinion drivetrain that effectively puts an end to poor shifting performance and drivetrain maintenance. Founded by Porsche gearbox engineers, Pinion is a cutting edge gearbox company building amazing bicycle transmissions in Germany. The Viral Bikes Skeptic frame kit will come stock with their C1.12 twelve speed internal gearbox transmission. This amazingly robust and nearly maintenance free system was borne to defy current mountain bike standards and laugh in the face of traditional drivetrains. It’s sealed, completely, from the elements and only requires a fluid change once every 6000 miles or once a year, whichever comes first. In addition, the Pinion gearbox comes with a 2 year guarantee that your shifting will be perfect, no questions asked, as long as the fluid is changed within the prescribed schedule (An optional 5 year guarantee can be purchased for an additional price). Coupled with the Gates belt drive, the Skeptic is nearly maintenance free. Just ride, rinse, and repeat.


wheel size26+/27.5"27.5+/29"27.5+/29"27.5+/29"
a seat tube length390432480520
b top tube length - effective*592624646670
c head tube length105115125140
d chainstay length**430435435435
E front and center*745778802829
F wheelbase*1174120912341260
G seat tube angle*75.5°75.5°75.5°75.5°
H head tube angle*65.5°65.5°65.5°65.5°
I stack*588634644657
J reach*440460480500
bb drop*25454545
Units are in millimeters, click to view them in inches.
**measurement in the shortest position

• 31.6mm seatpost, internal dropper post cable routing compatible
• Internal (integrated) tapered headtube, IS41 upper, IS52 lower
• 148/12 Boost thru axle


  • Viral Bikes triple butted titanium tubeset delivers an amazingly defiant ride
  • 27.5+ (3” tire clearance) or 29” wheel compatible, tailor this trail machine to your own desires
  • Pinion C1.12 gearbox delivers 600% gear range, that’s 80% more gear range than the new SRAM 1×12 system
  • Comes with Gates belt drive and front and rear Gates cogs
  • 150-160mm fork compatible
  • 31.6mm seat post, compatible with internal dropper post routing.
  • 148mm Boost rear hub spacing
  • 4.25 lbs. for medium frame
  • $4,795 frame and drivetrain kit

* Geometry measurements based on a 150mm travel fork


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