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(Some components in these photos may differ from the spec sheets. Please refer to the spec sheets below for accuracy)

There’s one in every family. That one that feels excluded from the bunch. If you’re down with that attitude because you like to go your own way, then we’d like to introduce you to the rowdiest member of the RSD family – the MiddleChild.

Some of our bikes are great at getting the job done – real authorities. The 29/27.5+ MiddleChild gets it done, but the only thing on the agenda is playtime. Every detail on this premium-quality handmade steel frame screams “skip work and let’s party!”

  • double-butted, heat-treated 4130 Chromoly steel tubing

  • full CNC-machined custom yoke that’ll take 2.8″ tires (or up to 2.6″ x 29)

  • 64.5 degree head tube and 74 degree seat tube angles paired with 140mm fork –  that aggressive geometry for both climbing and sending choice descent lines

  • boost spacing and short chainstays (adjustable from 415mm – 430mm) for super stability and loads of confidence in the rough stuff

  • Choose from either Duroc 40 27.5+ wheels with Nobby Nic 27.5×2.8 Addix SpeedGrip tires or Duroc 35 29in wheels with Maxxis Minion DHF 2.5 Front and Aggressor 2.5 Rear


The MiddleChild is a purely new-school ‘Enduro’ hardtail…

…that will never get left behind.

27.5+ SX Build

  • Frame: 27.5+/29 Cr-Mo 4130 Double Butted and Heat Treated

  • Fork: Rockshox Recon RL 27.5+/29 140mm 51mm

  • Headset: Cane Creek ZS-44

  • Handle Bar: Race Face 35mm Chester 780mm

  • Stem: Race Face 35mm Ride 50mm

  • Grips: Ergon GE10 Black

  • Front Wheel: Sun Ringle Duroc 27.5x40mm Front 15x110mm Boost

  • Rear Wheel: Sun Ringle Duroc 27.5x40mm Rear 12x148mm Boost

  • Crank: SRAM SX Eagle 175mm DM

  • Chain Ring: SRAM SX 30T Ring

  • BB: SRAM DUB 73mm BSA

  • Chain: SRAM NX Eagle 12spd

  • Cassette: SRAM SX Eagle PG-1210 10-51T 12spd

  • Rear Shifter: SRAM SX Eagle Trigger 12spd

  • Rear Derailleur: SRAM SX Eagle Long Cage 12spd

  • Brakes: SRAM Level

  • Rotors: SRAM Centerline 180mm Rounded

  • Saddle: WTB Volt Comp 142mm

  • Seat Post: Race Face Ride / KS LEV Dropper (S 125mm, M & L 150mm, XL 175mm) with SouthPaw Lever

  • Rear Axle: SRAM 180mm Rear Maxle Ultimate 12x148mm

  • Tires: Schwalbe Nobby Nic 27.5 x 2.8 Addix Evolution Speedgrip


Frame Weight with Sliding Inserts and Hardware
(M): 6 Lbs 10 oz
(L): 6 Lbs 14 oz


Complete Bike Weight 
(M): 30 Lbs 1 oz with Dropper and set-up Tubeless
(M): 29 Lbs 7 oz with Turbine Seat Post and set-up Tubeless


Sizes: Sm, Med, Lrg, Xlrg


Finish: Matte Black, Turquoise & Orange


Pricing: (NEW)
Complete : $2299.00 CAD / $1949.00 USD + Shipping
Complete w/Dropper : $2599.00 CAD / $2199.00 USD + Shipping
Frame Only: $804.00 CAD / $704.00 USD + Shipping


Included with the Frame Only option:
Rear 12x148mm Sliding Drop-out Inserts
SRAM Rear Maxle Ultimate 12x148mm
Seat Post Clamp

Prices and Specs are subject to change without notice.

Note: We are unable to accommodate any single component substitution from one build to another, BUT we can accommodate the substitution of an entire build. Pricing will be dependent on the build and/or frame material at RSD’s sole discretion. All prices listed are Minimum Suggested Retail.

Looking for something more versatile?

SERGEANT V4 Aluminum

Or maybe something lower, longer and slacker?

RS-291 Chromoly

How about a less expensive build option?


Ready for the ultimate hardtail?

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