Mixed Wheel Builds

29"F / 27.5"R

Your Frame Size
Frame Size
Ship Time:
1-2 Weeks
0% Financing Available
Weight: 7.2797

Modular Mixed-wheel Madness

Powered by GG’s Modular Frame Platform, the MX Rally build is our mixed-wheel option that combines progressive geometry with a playful spirit on our US-built bikes. Available on the Megatrail, the MX Rally builds deliver another layer of customization, allowing riders to experience the stability of a 29er with the maneuverability of a 27.5.

Designed to bookend GG’s most aggressive geometries, the Megatrail modular platform is the perfect fit for a mixed-wheel build. The 165mm Gravity Mode is the “lowest and slackest” configuration from GG. For trail and technical riding, the 155mm Trail Mode adds a slightly higher and steeper option.

Frame Features

Frame Features



Megatrail MX Geometry

Size 2

Size 3

Size 4

A. Head Angle* 63.8º/63.2º 63.8º/63.2º 63.8º/63.2º
B. Seat Tube Angle - Actual 72º 72º 72º
C. Seat Tube Angle - Effective 75.7º 75.6º 75.5º
D. Bottom Bracket Height* 352-344 mm 352-344 mm 352-344 mm
E. Chainstay Length 433 mm 433 mm 433 mm
F. Effective Top Tube** 590 - 600 mm 615 - 625 mm 645 - 655 mm
G. Reach** 437 - 447mm 462 - 472mm 492 - 502mm
H. Stack 616 mm 634 mm 652 mm
I. Wheelbase** 1219 - 1229 mm 1252 - 1262 mm 1291 - 1301 mm
J. Standover 735 mm 738 mm 740 mm
K. Head tube Length 100 mm 120 mm 140 mm
L. Seat tube Length 400 mm 430 mm 480 mm
* With 29"/170mm fork/wheel in Trail or Gravity Mode
** GeoAdjust Headset offers 10 mm of adjustment between Long and Short setting
Frame Specs

Frame Specs

  • Revved Carbon Technology
  • GG Modular Frame Platform w/ GeoAdjust Headset
  • Freedom Linkage - our proprietary suspension design that provides a wide adjustment range and is versatile enough for air or coil shocks.
  • Integrated-External cable routing - combines the sleekness of internal routing with the maintenance-friendly access of external routing
  • Water bottle mount, all frame sizes
  • Proudly made in Colorado
  • Frame material: Revved Carbon Technology with 6061 aluminum rear triangle
  • Shock hardware: 8x20 (f), 8x35(r)
  • Seatpost: 30.9 mm with stealth dropper routing
  • Seatpost clamp: 37 mm (included with frame)
  • Max seatpost insertion: See Dropper Fitment Guide
  • Chainguide mount: ISCG05
  • Bottom bracket: 73 mm BSA threaded
  • Chainline: Compatible with 52 - 55 mm
  • Max chainring size: 34t
  • Rear spacing: 12 x 148 Boost rear hub, offset 3 mm to the drive side for optimal chainline and clearance
  • Derailleur hanger: Universal Syntace X-12 Type 1
  • Brake mount: ISO
  • Max tire size: 27.5" x 2.5"