Surly Moonlander | The Largest Fat Tire Bike | Worlds Biggest Fat Bike (2024)

The fat tire bikepurpose-built for rolling overpreviously unridden terrain.

When we find ourselves with a deep, primal urge to explore beyond the horizons of our beloved Flat Earth, few things satiate this need. Moonlander is one of them.

A portal into previously unridden terrain, Moonlander goes where other fat bikes don’t dare, where traction is a supposed myth and the only grams worth saving are in our Dugout Bag.

Our newly developed, high-volume Molenda tires were key. (Even the fattest in-market tires don’t cut it, and that includes our own line.) Therefore, we equipped this one with 24 x 6.2-inch tires on 100mm rims. Such a large footprint allows us to ride at very low pressure, enabling the ability to float over a geographic smorgasbord of otherworldly terrain. Think rocky dunes, creeping shorelines, frozen beaches, sinuous stretches of snow and the like.

Carefully crafted from our 4130 Chromoly steel, with a bottom bracket height that supplies plenty of clearance for bushwhacking and monster-trucking without losing out on stability
Surly's first bike with a 9-speed Pinion gearbox, an innovative approach to spur gearing that improves reliability and go-anywhere performance with less maintenance

The top tube maximizes standover height and foot dabs into soft substances, while keeping the headtube high so you can set up your rig in a comfortable, all-day-grind riding position

Large volume Surly Molenda Tires on 24 x 100mm Surly Clown Royal Rims inflated by new TPU tubes creates a footprint large enough to float over unrideable (until now) terrain

Clearance for 24 x 6.25” tires, as well as 26 x 5.1”, 27.5 x 4.8”, and 29 x 3”

Comes with rack and fender mounts, as well as accessory mounts on both fork blades to enhance cargo capacity (compatible with our rear disc wide rack)

Weight distribution across front and rear, with a longer back, allows for greater stability

Features Tektro HD-M285 Hydraulic Disc Brake System

Four frame sizes to fit most riders: SM, MD, LG, XL

Includes a dropper for easier on and off, especially on soft surfaces

Bike Capabilities

5/5 with FloatationFloatation: 5 out of 5
5/5 with Off-Trail ExplorationOff-Trail Exploration: 5 out of 5
4/5 with BikepackingBikepacking: 4 out of 5
5/5 with Turning HeadsTurning Heads: 5 out of 5

NOTE: You can ride your bike wherever the hell you want, but this is what we think this bike is best at.

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Where to Buy

Specifications

Frameset

Frame: 4130 Chromoly, Natch tubing, double-butted main triangle, TIG welded, ED coated

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

Seatpost Clamp: Surly Stainless 33.1mm

Components

Headset: Cane Creek 40

Brakes and rotors: Tektro HD-M285, Tektro 180/180, 6-Bolt

Shifter: Pinion Rotary Shifter

Stem: Promax, 31.8, 4-bolt

Handlebar: Surly Terminal

Grip/Tape: Velo Lock-on

Saddle: WTB Volt Medium

Seatpost: TransX YSP15JL Dropper, 125mm travel (100mm travel on SM)

Drivetrain

Crankset: Pinion for Surly crankset 34T, with Pinion high-offset spider

Bottom Bracket: Pinion Gearbox

Front Derailleur: N/A

Rear Derailleur: Pinion C1.9 XR 9spd Gearbox

Cog or cogset: 34t aluminum ring

Chain: KMC X10 EPT Anti-Rust

Wheels

Front hub: Novatec 12x197mm, Thru-Axle, 32h

Rear hub: Novatec 12x197mm, Thru-Axle, 32h

Rims: Surly Clown Royal 24", 100mm wide

Tires: Surly Molenda Tire 24 X 6.2”, 60tpi, Tubeless Ready

Complete bike spec subject to change

units:

Select a few bike sizes to compare.

SIZE	SM	MD	LG	XL
Rider Height	5'4"–5'8"1626–1728	5'7"–6'0"1702–1829	5'11"–6'3"1803–1905	6'2"–6'6"1880–1981
Reach	15.7398	16.5420	17.5444	18.4468
Stack	22.8578	23.9606	24.6625	25.3644
Head Tube Angle	68.5°	68.5°	68.5°	68.5°
Head Tube Length	4.7120	5.9150	6.7170	7.5190
Seat Tube Length	14.5368	16.5419	18.9480	20.5521
BB Drop	1.845	1.845	1.845	1.845
Wheelbase	47.91215	49.11248	50.41280	51.61311
Chainstay Length	22.1562	22.1562	22.1562	22.1562
Top Tube Length, Effective	22.6575	23.8605	25.0635	26.2665
Seat Tube Angle	73°	73°	73°	73°
Standover Height	29.0736	30.3769	31.2793	31.5801
BB Height	13.7349	13.7349	13.7349	13.7349
Stem Length	2.460	2.460	2.870	3.180
Stem Angle	6°	6°	6°	6°
Handlebar Width	28.9735	28.9735	28.9735	28.9735
Crank Length	6.7170	6.7170	6.7170	6.7170
Fork Length	18.1460	18.1460	18.1460	18.1460
Fork Rake	2.050	2.050	2.050	2.050

Design Wheel/Tire Size (Tire Clearance): 24” x 6.2”

Alternate Wheel/Tire Size: 26” x 5.1”, 27.5” x 4.8”, 29” x 3”

Rigid Fork Length: 460 x 50mm

Front Hub Spacing: 12 x 197mm (Surly axle included)

Seatpost Diameter: Ø30.9mm

Dropper Compatible: Yes, internal dropper post routing compatible

Front Derailleur Clamp: N/A

Bottom Bracket: N/A; no frame limitations

Rear Hub Spacing: 12 x 197mm (Surly axle included)

Support

Downloads

Moonlander Frame Sheet
[pdf] - 1.5MB
Fork Instructions
[pdf] - 6.9MB
Surly Bike Sizing Chart
[pdf] - 308KB
Universal Thru-Axle Instructions
[pdf] - 269KB
Wheel, Rim, and Tire Instructions
[pdf] - 763KB
Bicycle Owner’s Manual (English)
[pdf] - 1.2MB

Frame Warranty

LIMITED WARRANTY

This Surly product is warranted against defects in materials and workmanship for three years from the date of retail purchase of the product, subject to the limitations detailed below. Save your dated receipt for proof of purchase.

This warranty does NOT cover the following:

Damage due to improper assembly or follow-up maintenance or lack of skill, competence or experience of the user or assembler
Products that have been modified, neglected, used in competition or for commercial purposes, misused or abused, involved in accidents or anything other than normal use
Installation of components, parts or accessories not originally intended for or compatible with bicycle as sold
Damage or deterioration to the paint, surface finish, aesthetics or appearance of the product
Normal wear and tear
Labor required to remove and/or refit and re-adjust the product within the bicycle assembly

This limited warranty is expressly limited to the repair or replacement of a defective product, at the option of Surly, and is the sole remedy of the warranty. This limited warranty applies only to the original purchaser of the Surly product and is not transferrable. This warranty applies only to products purchased through an authorized dealer or distributor. In no event shall Surly be liable for any loss, inconvenience or damage, whether direct, incidental, consequential, or otherwise resulting from breach of any express or implied warranty or condition, of merchantability, fitness for a particular purpose, or otherwise with respect to our products except as set forth herein.

This limited warranty gives the consumer specific legal rights, and those rights and other rights may vary from place to place. This limited warranty does not affect your statutory rights.

TO THE EXTENT NOT PROHIBITED BY LAW, THESE WARRANTIES ARE EXCLUSIVE AND THERE ARE NO OTHER EXPRESS OR IMPLIED WARRANTIES OR CONDITIONS INCLUDING WARRANTIES OR CONDITIONS OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

Dugout Bag
$45
Choose a color.
Junk Rag
$10–12
Choose a color.
Junk Straps
$8–40
Choose a color.