Grizzly Fat Bike

Overview Design Geometry Details Finishes Ordering

Shreddable Art: a remarkably-agile fat bike in buttery Titanium.

We built the Grizzly because we wanted a bike that could fit the most capable fat bike tires available, without compromise to geometry, or pedaling efficiency - or fun. And we wanted it to be beautiful.

Inspired by modern trail bike design, the geometry is more forward looking than other fat bikes on the market: short chainstays for playfulness, low bottom bracket for stability, long reach and steep seat angle for an efficient pedaling position and to center your weight in the bike, compatibility with long-travel dropper posts, and a head angle that balances precise steering with sure-footedness.

The latest generation of Grizzly fat bike makes judicious use of advanced additive manufacturing (3D-printing) technology - head tube, dropouts, and chainstay yoke are made from 6Al/4V Titanium by Selective Laser Melting - resulting in a frame that is a unique combination of cutting edge fabrication, and classic looks.

Advanced Design

The Grizzly's foundation is a wide T47 bottom bracket shell, and 197mm rear spacing, that maximizes rear-end stiffness and tire clearance. The main triangle is made from oversized, shaped, seamless, Cold Worked Stress Relieved (CWSR) 3Al/2.5V Titanium tubing, to create a ride that is both lively and precise.

The chainstays and 3D printed yoke are highly optimized to squeeze out every last mm of tire clearance without lengthening the rear-center: 26x4.8" or 27.5x4.3" tires can be run on 85mm rims. They are compatible with up to a 32T chainring, and the narrowest Q-factor fat bike cranks.

The seamlessly integrated, 3D printed dropouts incorporate a post mount that protects the rear brake, and creates a stiff platform by triangulating it between the stays. The dropouts use the Universal Derailleur Hanger (UDH), are Sram Transmission (direct-mount rear derailleur) compatible, and utilize a conical, Syntace-style head for maximum stiffness and precision.


Rise Bikes Grizzly Titanium Fat Bike Geometry

Metric Size M L
Top Tube (T) 604mm 629mm
Seat Tube (S) 425mm 445mm
Seat Angle (s) 76° 76°
Head Tube (H) 105mm 125mm
Head Angle (h) 67.5° 67.5°
BB Drop (B) 70mm 70mm
Chainstay (C) 434mm 434mm
Fork Length (F) 489mm 489mm
Fork Offset (O) 42mm 42mm
Wheelbase (W) 1145mm 1173mm
Reach (R) 455mm 475mm
Stack (St) 605mm 623mm

Frame Details

  • T47 Bottom Bracket (custom 126mm width)
  • Tapered head tube for 44/56mm zero stack (ZS) headset (1.125-1.5 fork)
  • Choice of full internal, or external, brake & shift cable routing (internal uses 3D printed head tube with integrated cable guides and head badge; external uses machined head tube with screw-on cable guides and head badge)
  • 30.9mm Seatpost (34.9mm Rise Titanium seat collar) with routing for internal dropper
  • Long travel dropper compatibility (max insertion 250mm)
  • 3D Printed dropouts: UDH derailleur hanger, conical axle head, 160mm rear post-mount with replaceable threads
  • 197mm rear spacing with custom Wheels Manufacturing conical axle
  • 75.5mm chainline, crankset Q-factor can be as low as 203mm
  • Handmade in the Front Range of Colorado


We can accommodate a range of finish requests, with various choices for the frame's overall texture, and for the contrasting logos. Our favorite is a bright-brushed frame finish with polished logos. We can also give the frame a satin media-blasted finish with brushed or polished logos. If you like, we can add custom decals to your frame to make it even more unique, and/or combine the finish textures with anodizing to create some color. Let us know what you have in mind and we will try to make it a reality.


Each Rise Grizzly frame is handmade in the Front Range of Colorado. We sell the Grizzly as a complete bike, with a wide range of components options. We will work with you and your budget to ensure that the build meets your needs, and excites your imagination. Send us an email, or give us a call to talk about your dream bike (phone number in footer).

Rise Bikes Grizzly Titanium Fat Bike Winter Snow