Surly Moonlander runs 4.8: tires on 100mm rims. Such a large footprint allows you to ride them at very low pressure, which (as with a snowshoe) enables unparalleled traction and float over all kinds of terrain...wet stuff, roots, rocks, pebbles, gravel, sand, and many types of snow. Moonlander, like its name implies, is meant to go beyond where normal bikes, even normal fat bikes, can go. It is designed from the ground up to ride where there are no roads, no trails and no people.
Like all of our framesets, Moonlander is made of 4130 cro-moly steel, with tubing designed specifically for this frame. The frame's geometry is not unlike a standard mountain bike, with a bottom bracket height that supplies plenty of clearance for bushwhacking and monster-trucking while remaining low enough for a stable ride. The toptube maximizes standover height while keeping the headtube fairly high so you can set up your rig with a comfortable, all-day-grind riding position.
The frame features 135mm-spaced horizontal 'dropouts' with a derailleur hanger, meaning you can set it up as a singlespeed, with an internal gear hub, or standard derailleur drivetrain. The rear end is offset 28mm to allow the drivetrain and wide tires to play nicely together. Moonlanders come with a 135mm O.L.D. non-offset fork, but if you like being able to swap front and rear wheels you could get one matching the rear offset. In fact, all of our fat forks share the same axle-to-crown and rake measurements, so they're all interchangeable. The fork sports a 51mm I.S. disc caliper mount designed for a rear brake, and mid-blade thru-eyelets and lower rack barrels for mounting a fender and rack (you'll probably need to alter something to fit, but the option is there should you choose to).
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Frame: Surly Moonlander, Surly 4130 CroMoly steel. Main triangle double-butted. TIG-welded
Fork: Surly Moonlander, Tapered straight blade butted 4130 CroMoly. 51mm IS front disc mount. 135mm-spaced dropouts
Seatpost clamp: Surly Stainless, 30.0mm (Surly stainless included)
Crankset: Surly O.D. 100mm, 22/36t
Bottom Bracket: Surly Enduro, w/sleeve
Front Derailleur: Shimano SLX FD-676D, Problem Solvers direct mount adapter. Top-pull. Black
Rear Derailleur: Shimano Deore XT RDT780 SGS, Black
Cog or Cassette: Shimano SLX CS-HG81-10, 10-speed 11-12-14-16-18-21-24-28-34t
Chain: KMC x10RB, Silver
Headset: Cane Creek 40, 1-1/8" threadless. Black
Brakes: Avid BB7, Cable actuated. 180/160mm rotors front & rear
Brake Levers: Avid SD-1, Black
Shifters: Shimano SLX SA-109, 2 x 10
StemKalloy; AS025N, 31.8mm. 7° rise. 4-bolt. Aluminum. Black
Handlebar: Salsa ProMoto 2, 31.8mm. 11° bend. Black
Saddle: Velo VL2155, Steel rails. Black vinyl. Feels pretty o.k.
Seatpost: Kalloy SP-342, 27.2mm. 350mm. Black
Front Hub: Surly New Disc 135mm, Disc. 32-hole. Black
Rear Hub: Shimano XT 135mm, 756. Disc. 32-hole. Black
Rims: Surly Clown Shoe, Single wall aluminum. Welded seam w/cutouts. 100mm width. Black.
Spokes: DT Swiss Champion, 14g. Black
Tires: Surly Bud & Lou, 4.8", 120tpi