Fat Bikes

From Singletrack to Snow—One Bike Rules It All Full carbon frame with a svelte top tube and stay shaping for long rides and epic adventure comfort. The LES Fat features a tailored carbon lay-up for each size ensuring optimal ride characteristics for all rider profiles. VERIFIED VERSATILITY The LES Fat fits all fat and plus wheel sizes, via the patented Swinger II dropout system, without compromises to the bike's geometry. The Swinger II dropout system also allows for ease of switching between a geared and single speed set up. EASY ON THE KNEES The LES Fat features a kind-to-your-knees narrow Q-factor design. With a minimum Q-factor of 210mm, this is similar to the Q-factor on bikes designed for the narrower 170mm rear hub spacing. ENGINEERED FOR THE INDIVIDUAL Our engineers know a bike's set-up is subjective, so for the LES Fat they made it possible to swap the suspension, wheel size and drivetrain to the rider's preference. Ensuring the perfect set-up for ample saddle time. PRODUCT DETAILS - Get everything you need to know about the Les Fat. - Fits all fat/plus wheel sizes (26" X 3.8-5.0", 27.5" X 3.8-4.5", 27.5+, 29" and 29+) via Swinger II dropout system, without geometry compromises - New 27.5" Fat and 27.5+ wheel and tire spec - Full carbon frame features svelte top tube and stay shaping for long ride and epic adventure comfort - Adjustable chainstay length - Kind-to-your-knees, narrow Q-factor design - 2x, 1x and singlespeed compatible - 197mm rear spacing and optimized design clears 5" tires with massive clearance for snow, mud and sand - Pivot-designed carbon fork with 150mm spacing. Suspension fork compatible - Integrated rear rack mounts - Three water-bottle mounts - 10-year warranty

Since 2013, Borealis has specialized in lightweight carbon fiber fat bikes. The Crestone is our tried and true flagship model. Its frame geometry is optimized for riding in snow and sand with clearance for up to 5” wide tires. Paired with the most technically advanced components in the industry, the Crestone sets the standard for premium quality carbon fiber fat bikes. HIGHLIGHTS: Standard features include: SRAM Eagle NX 12-Speed drivetrain, SRAM Level T brakes, rigid carbon fork, carbon handlebars, carbon seat post, durable Sun Ringle Mulefüt rims and your choice of tires. Frame geometry provides responsive handling, offering maximum control for varying conditions in snow or sand. Tire clearance up to 26x5” and 27.5x4.5”. Compatibility for 100-120mm of suspension travel for more technical riding. Lightweight, durable carbon fiber frame comes with internally routed cables, 2-3 bottle cage mounts and lizard skin protectors on both the down tube and drive-side chain stay. COMPATIBILITY: Rockshox Bluto Fork tire size limitations: 26x5” or 27.5x4” Mastodon Pro EXT Fork tire size limitations: 26x5” or 27.5x4.5” Borealis Rigid Carbon Fork tire size limitations: 26x5” or 27.5x4.5” Dually 29x45 and 27.5x45 Rims – Max tire width: 3” All rims 65mm to 85mm wide are compatible with tire widths of 3.8” to 5” HED Carbon 100mm Rims – Max tire width of 4.6”

With premium frame quality and only the best components, the Borealis Flume offers the best value on the market. This expedition-ready fatty mirrors the Crestone geometry, but does so in lightweight, 6000-series aluminum. Up mountains, down glaciers, and across deserts - the Flume is ready for action. There are all kinds of alloy fat bikes on the market, but none with the Flume’s purebred heritage and durability. HIGHLIGHTS Standard features include: SRAM Eagle NX 12-Speed drivetrain, SRAM Level T brakes, Mastodon Pro Ext. fork, carbon handlebars, carbon seat post, durable 26" Sun Ringle Mulefüt rims and 4.8" Schwalbe Jumbo Jim Tires for max snow flotation. Frame geometry provides responsive handling, offering maximum control for varying conditions in snow or sand. Tire clearance up to 26x5” and 27.5x4.5”. Lightweight, 6000-series aluminum frame comes with 2-3 bottle cage mounts, rear rack mounts on seat stays and Lizard Skin protectors on both the down tube and drive-side chain stay.

With premium frame quality and only the best components, the Borealis Flume offers the best value on the market. This expedition-ready fatty mirrors the Crestone geometry, but does so in lightweight, 6000-series aluminum. Up mountains, down glaciers, and across deserts - the Flume is ready for action. There are all kinds of alloy fat bikes on the market, but none with the Flume’s purebred heritage and durability. HIGHLIGHTS Standard features include: SRAM Eagle NX 12-Speed drivetrain, SRAM Level T brakes, rigid carbon fork, carbon handlebars, carbon seat post, durable 26" Sun Ringle Mulefüt rims and 4.8" Schwalbe Jumbo Jim Tires for max snow flotation. Frame geometry provides responsive handling, offering maximum control for varying conditions in snow or sand. Tire clearance up to 26x5” and 27.5x4.5”. Lightweight, 6000-series aluminum frame comes with 2-3 bottle cage mounts, rear rack mounts on seat stays and Lizard Skin protectors on both the down tube and drive-side chain stay.

With premium frame quality and only the best components, the Borealis Flume offers the best value on the market. This expedition-ready fatty mirrors the Crestone geometry, but does so in lightweight, 6000-series aluminum. Up mountains, down glaciers, and across deserts - the Flume is ready for action. There are all kinds of alloy fat bikes on the market, but none with the Flume’s purebred heritage and durability. HIGHLIGHTS Standard features include: SRAM Eagle NX 12-Speed drivetrain, SRAM Level T brakes, rigid carbon fork, carbon handlebars, carbon seat post, durable Sun Ringle Mulefüt rims and your choice of tires. Frame geometry provides responsive handling, offering maximum control for varying conditions in snow or sand. Tire clearance up to 26x5” and 27.5x4.5”. Compatibility for 100-120mm of suspension travel for increased comfort and control. Lightweight, 6000-series aluminum frame comes with 2-3 bottle cage mounts, rear rack mounts on seat stays and Lizard Skin protectors on both the down tube and drive-side chain stay. COMPATIBILITY Rockshox Bluto Fork tire size limitations: 26x5” or 27.5x4” Mastodon Pro EXT Fork tire size limitations: 26x5” or 27.5x4.5” Borealis Rigid Carbon Fork tire size limitations: 26x5” or 27.5x4.5” Dually 29x45 and 27.5x45 Rims – Max tire width: 3” All rims 65mm to 85mm wide are compatible with tire widths of 3.8” to 5” HED Carbon 100mm Rims – Max tire width of 4.8”

**If shipping the bike you will be contacted with exact shipping charges before the item ships. Shipping charges in cart are an estimate only. It'll take way more than hell freezing over to stop the Blizzard. With massive tire real-estate and mega clearance, snow's no issue for the Blizzard. Don't mistake it for a fat-tired gimmick—aggressive trail geometry and a no-nonsense mountain bike ride character differentiates it from the bandwagoners. The result? Send trail and rip commutes as aggressively and shredly as you want. Winter's here. Ice to see you. - All new Smoothwall Carbon frame and fork - Trail geometry for playing in soft conditions - High performance tires: it's all about the rubber with fat bikes! - Reliable, rebuildable, service supported rear hub for high torque fatbiking - Thru axles front and rear - Mounts for multiple bottle, racks, tools and more

Have it both ways! Our Borealis Flume bikes come dirt-ready with 27.5 X 3" plus tires and Bluto suspension forks. As a bonus, these are fully fat-compatible and ready for winter with the addition of a fatbike wheelset. With premium frame quality and only the best components, the Borealis Flume offers the best value on the market. This expedition-ready MTB mirrors the Crestone geometry, but does so in lightweight, 6000-series aluminum. Up mountains, down glaciers, and across deserts - the Flume is ready for action. There are all kinds of alloy bikes on the market, but none with Flume’s purebred heritage and durability. HIGHLIGHTS Traditional fatbike bike geometry is both responsive and nimble for variable conditions in snow or sand. Standard features include Eagle NX 12-Speed drivetrain, Rock Shox Bluto Fat Bike Fork. carbon handlebars, carbon seat post and durable Velocity 27.5 rims with dirt-gripping Schwalbe Nobby Nic 3" tires. New Moon offers HED alloy and carbon fatbike wheelsets to upgrade a summer-ready Flume demo starting around $1700. Contact us for more info.

Have it both ways! Our Borealis Flume summer demo bikes come dirt-ready with 27.5 X 3" plus tires and Bluto suspension forks. As a bonus, these are fully fat-compatible and ready for winter with the addition of a fatbike wheelset. With premium frame quality and only the best components, the Borealis Flume offers the best value on the market. This expedition-ready MTB mirrors the Crestone geometry, but does so in lightweight, 6000-series aluminum. Up mountains, down glaciers, and across deserts - the Flume is ready for action. There are all kinds of alloy bikes on the market, but none with Flume’s purebred heritage and durability. HIGHLIGHTS Traditional fat bike bike geometry is both responsive and nimble for variable conditions in snow or sand. Standard features include Eagle NX 12-Speed drivetrain, Rock Shox Bluto Fat Bike Fork. carbon handlebars, carbon seat post and durable Velocity 27.5 rims with dirt-gripping Schwalbe Nobby Nic 3" tires. Note: these demos DO NOT include snow-ready wheels and tires. New Moon offers HED alloy and carbon fat bike wheelsets to upgrade a summer-ready Flume demo starting around $1700. Contact us for more info.

**If shipping the bike you will be contacted with exact shipping charges before the item ships. Shipping charges in cart are an estimate only. It'll take way more than hell freezing over to stop the Blizzard. With massive tire real-estate and mega clearance, snow's no issue for the Blizzard. Don't mistake it for a fat-tired gimmick—aggressive trail geometry and a no-nonsense mountain bike ride character differentiates it from the bandwagoners. The result? Send trail and rip commutes as aggressively and shredly as you want. Winter's here. Ice to see you. - Updated 6061 Alloy frame - Trail geometry for playing in soft conditions - Lightweight rigid fork - High performance tires: it's all about the rubber with fat bikes! - Reliable, rebuildable, service supported rear hub for high torque fatbiking - Thru axles front and rear - Mounts for multiple bottle, racks, tools and more

With premium frame quality and only the best components, the Borealis Flume offers the best value on the market. This expedition-ready fatty mirrors the Crestone geometry, but does so in lightweight, 6000-series aluminum. Up mountains, down glaciers, and across deserts - the Flume is ready for action. There are all kinds of alloy fat bikes on the market, but none with Flume’s purebred heritage and durability. HIGHLIGHTS Traditional fat bike geometry is both responsive and nimble for variable conditions in snow or sand. Standard features include Eagle NX 12-Speed drivetrain, rigid alloy fork, carbon handlebars, carbon seat post and durable Sun-Ringle Mulefut rims. Tire clearance up to 26x5” and 27.5x4.5”. Compatibility for 100-120mm of suspension travel for increased comfort and control. Lightweight, 6000-series aluminum frame comes with 3 bottle cage mounts, rear rack mounts on seat stays and Lizard Skin protectors on both the down tube and drive-side chainstay.

**If shipping the bike you will be contacted with exact shipping charges before the item ships. Shipping charges in cart are an estimate only. It'll take way more than hell freezing over to stop the Blizzard. With massive tire real-estate and mega clearance, snow's no issue for the Blizzard. Don't mistake it for a fat-tired gimmick—aggressive trail geometry and a no-nonsense mountain bike ride character differentiates it from the bandwagoners. The result? Send trail and rip commutes as aggressively and shredly as you want. Winter's here. Ice to see you. - Updated 6061 Alloy frame - Trail geometry for playing in soft conditions - Lightweight rigid fork - High performance tires: it's all about the rubber with fat bikes! - Reliable, rebuildable, service supported rear hub for high torque fatbiking - Thru axles front and rear - Mounts for multiple bottle, racks, tools and more

The forecast is calling for cold temperatures, a dump of snow, and all you want to do is ride your bike. Sounds great, let's hit it! There's no need to put a hold on riding during those long winter months, you just need the right tool for the job. The Blizzard is a proper mountain bike with aggressive trail geometry and massively wide tires, ensuring you're ready to ride no matter what the conditions are. - Trail geometry for playing in soft conditions - Lightweight rigid fork - High-performance tires: it's all about the rubber with fat bikes! - Reliable, rebuildable, service supported rear hub for high torque fat biking - Thru-axles front and rear - New 27.5 wheel spec - All new Carbon rigid fork with 3 pack cargo mounts - New Shimano I-Spec EV brakes for an uncluttered cockpit - Shimano SLX drivetrain for bulletproof performance - 4.5" wide tires for maximum floatation. Studdable construction - Tubeless-ready out of the box - Rocky Mountain Toonie drop post helps remount in soft snow

It'll take way more than hell freezing over to stop the Blizzard. With massive tire real-estate and mega clearance, snow's no issue for the Blizzard. Don't mistake it for a fat-tired gimmick—aggressive trail geometry and a no-nonsense mountain bike ride character differentiate it from the bandwagoners. The result? Send trail and rip commutes as aggressively and shredly as you want. Winter's here. Ice to see you. - Updated 6061 Alloy frame - Trail geometry for playing in soft conditions - Lightweight rigid fork - High performance tires: it's all about the rubber with fat bikes! - Reliable, rebuildable, service supported rear hub for high torque fatbiking - Thru axles front and rear - Mounts for multiple bottle, racks, tools and more

**If shipping the bike you will be contacted with exact shipping charges before the item ships. Shipping charges in cart are an estimate only. It'll take way more than hell freezing over to stop the Blizzard. With massive tire real-estate and mega clearance, snow's no issue for the Blizzard. Don't mistake it for a fat-tired gimmick—aggressive trail geometry and a no-nonsense mountain bike ride character differentiates it from the bandwagoners. The result? Send trail and rip commutes as aggressively and shredly as you want. Winter's here. Ice to see you. - Updated 6061 Alloy frame - Trail geometry for playing in soft conditions - Lightweight rigid fork - High performance tires: it's all about the rubber with fat bikes! - Reliable, rebuildable, service supported rear hub for high torque fatbiking - Thru axles front and rear - Mounts for multiple bottle, racks, tools and more