Off-road enthusiasts have been Frankensteining drop bars onto trail bikes for decades, so we designed the Grappler to scratch that itch with a little more precision. Engineered first and foremost around a stable and comfortable drop-bar hand position, its trail-ready geo provides a spirited ride on mixed terrain.

Cleared for girthy tires and decorated with an array of mounts for hauling your daily provisions and overnight gear, the Grappler is ready to take you and your paraphernalia down that overgrown fire road for an extrasensory experience. There’s nothing to be afraid of. Probably.

• Featuring Surly’s versatile Gnot-Boost spacing, allowing riders to run 142mm or Boost 148mm rear hubs; thru-axles; stealth dropper post routing; non-suspension corrected
• Custom dropouts ready to run single-speed or internally geared hub setups
• Seatstay-mounted bottle bosses, plus three-pack mounts at the top and bottom of the down tube
• Frame tire clearance: 27.5 x 2.8" w/ fender, 27.5 x 3.0" w/o fender, 29 x 2.1" w/ fender (front axle position, 29 x 2.5" w/ fender (rear axle position)

Build Kit

Frame

Surly Grappler - 4130 Chromoly, Natch tubing, double-butted main triangle, TIG welded, ED coated

Color

Subterranean Homesick Blue

Fork

Surly Dinner Fork - 4130 Chromoly, Natch tubing, double-butted tapered fork blades, TIG welded, ED coated

Components

Seatpost Clamp

Surly Stainless 33.1

*Specifications are subject to change without notice

 

Size	X-Small	Small	Medium	Large	X-Large
A. Effective Top Tube	22.05	23.23	24.02	25.2	25.98
B. Stand Over	28.31	30	31.3	32.64	33.94
C. Reach	15	15.94	16.54	17.48	18.03
D. Stack	23.03	23.78	24.53	25.24	25.98
E. Total Seat Tube Length	12.44	15.2	17.21	19.21	21.22
F. Headtube Length	6.3	7.09	7.87	8.66	9.45
G. Headtube Angle	69.5	69.5	69.5	69.5	69.5
H. Seat Tube Angle	73.0	73.0	73.0	73.0	73.0
I. BB Drop	1.97	1.97	1.97	1.97	1.97
K. Chainstay Length	16.73	16.73	16.73	16.73	16.73
L. Fork Length Axle to Crown	16.54	16.54	16.54	16.54	16.54
M. Fork Offset	1.97	1.97	1.97	1.97	1.97
N. Wheelbase	41.61	42.83	43.66	44.88	45.75
Recommended Rider Height	55.91 - 59.45	59.84 - 64.57	64.96 - 68.5	68.9 - 72.44	72.83

Frame Specs

Frame Specs

• Design Wheel/Tire Sizes27.5 x 2.5"
• Alternate Wheel/Tire Sizes29 x 2.2"
• Frame Construction100% Surly Chromoly Steel frame, Natch tubing, double-butted main triangle, TIG welded, E.D. coated
• Fork Construction 100% Surly Chromoly Steel fork, Natch tubing, double-butted tapered fork blades, TIG welded, E.D. coated
• Rigid Fork Length420mm
• Fork Offset50mm
• Axle to Crown420mm
• Rear Spacing "Gnot-Boost" 145mm
  12 x 142mm or 12 x 148mm (Surly axle included)
  10 x 135mm with Surly 10/12 Adapter Washers (not included)
• Rear Axle Size12 x 148mm (Surly axle included)
• Front Brake (Rotor)Disc - 51mm I.S. (203mm max rotor)
• Headset - UpperEC34/28.6
• Headset - LowerEC34/30
• Front Axle Size15 x 110mm (Surly axle included)
• Steerer TubeØ28.6mm
• Crown RaceØ30mm (1-1/8")
• Stem ClampØ28.6mm
• SeatpostØ30.9mm
• Dropper Post CompatibleYes
• Seatpost Clamp33.1mm
• Front Derailleur ClampØ34.9mm
• Front Derailleur TypeHigh direct mount top-pull (Ø34.9mm) 26mm offset adapter (not included) for 142 or 135mm rear hub spacing 29mm offset adapter (not included) for 148mm rear hub spacing
• Bottom Bracket73mm BSA, threaded
• Crankset (Max Ring)1x (mtn): 36T / 2x (mtn): 36/26T / 1x (Boost): 38T / 2x (Boost): 39/32T
• Bottle Mounts3-pack mounts on upper and lower downtube; seat tube bottle mounts on frame sizes S–XL
• Fork Mounts3-pack mounts on each fork blade, upper and lower threaded rack mounts
• Front Fender MountsYes
• Rear Fender Mounts Yes

Warning for Residents of California

⚠️ WARNING: This product can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.