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Why Cycles Big Iron V2 fat bike loads updated geometry plus SRAM UDH

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It may be named after the famous Marty Robbins song, but the Why Cycles Big Iron isn’t actually iron. Instead, it’s a titanium fat bike designed to be the ideal tool to venture out for all kinds of fat bike adventures. And now, the Big Iron has been updated with a few frame tweaks to make V2 even better.

Why Cycles Big Iron V2 fat bike

Like V1, the Big Iron V2 is intended for use with 27.5 x 4.4″ or 26 x 5″ fat bike wheels and tires. That includes adjustable dropouts which allow you to change the chainstay length from 445-460mm to keep the ride as snappy as possible with those gigantic tires.

Additionally, V2 includes a slightly longer reach and a taller stack height. Why claims that this increases the comfort and control of the original, resulting in a bike that handles better with low pressures up front. There’s also a lower seat tube and curved top tube for improved standover—which becomes more important on smaller sizes with the super tall 27.5 fat bike tires.

Why Cycles Big Iron V2 fat bike SRAM UDH derailleur hanger

As an added bonus, the rear dropout has been updated to be compatible with the SRAM UDH. With more and more companies adding the UDH to their bikes, we’re getting closer to realizing the potential of a truly universal derailleur hanger.

Why Cycles Big Iron V2 fat bike

Big Iron V2 Frame Specs

  • Headset Integrated standard 42mm upper cup, 52mm lower cup
  • Bottom Bracket Threaded 100mm BSA standard
  • Axle Spacing Boost 12mm x 197mm
  • Dropouts 12mm Thru Axle, 1.75 thread pitch, adjustable sliding and belt drive compatible
  • Bottle Mounts – Bottle mounts on seat tube, top of down tube, bottom of downtube. Third bottle hole mount on downtube for accessory mounting
  • Rack Mounts – All standard rack and fender mounts
  • Seatpost – 31.6mm
  • Seat clamp – 34.9mm
  • Brake – Max 180mm rear w/adapter, direct mount standard
  • Clearance – Max 27.5 x 4.5″ tires, 26 x 5.0″ tires or 29 x 3.0″
  • Universal Derailleur Hanger (UDH)

The Why Cycles Big Iron V2 is offered as a frame-only for $2,599, a frame and ENVE carbon fat fork-only for $3,099, and complete builds starting at $4,499 for the SRAM GX Eagle kit. Big Irons are currently available for pre-order only, and require a $100 non-refundable deposit to hold your place in line. From there, Why Cycles will contact you to confirm the order and give you a more accurate lead time.


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