Plus-size is fast becoming the new normal in mountain bikes. One year ago, you had only a few niche options in this category, loosely defined as including anything with 2.8-to-3-inch tires. At this year鈥檚 test we evaluated eight of the rigs, including our Gear of the Year winner, and another dozen are coming to market this season. These mid-fat machines add grip and confidence without the heft of a full fat bike, making them ideal for loose, sandy trails and super 颅capable on bigger-hit riding. While the development is still in its infancy, with manufacturers debating rim widths and rubber dimensions, we believe it鈥檚 a significant advance for dirt steeds. Of course, there are still plenty of great 鈥渟tandard鈥 mountain bikes out there (including four in this section), and depending on where you live and how you ride, one of those might be the best option. But as far as the bike industry is concerned, bigger (at least a little bit) is definitely better.
Specialized S-Works Stumpjumper FSR听6Fattie
Gear of the Year
Behold the finest trail bike money can buy鈥攑lus-size or otherwise. Several features set a step above its competition, including superb tire clearance, feathery but burly carbon Roval Traverse SL wheels, and the genius SWAT design, which hid a spare tube, tools, and sundries inside a down-tube hatch behind the bottle cage. Specs are just right, with a micro-adjustable IRcc dropper post and hard-scrabbling stock tires (meaty Purgatory up front, fast-rolling Ground Control in the rear). But this bike鈥檚 balanced and capable personality really won us over. The big, grippy tires had testers burning down chutes and precipitous rock drops with careless abandon. Its uphill manners amazed everyone, offering Velcro-like traction in loose chunk and steeps. It doesn鈥檛 ride portly鈥攊t just feels like the next step in the evolution of mountain-bike design.
Price $3,500 to $8,600 Weight 28.3 lbs
Orbea Occam TR M-Ltd
听Best For: Going faster.听
The Test: epitomizes the new cross-country race bike, with more travel (120 millimeters instead of the traditional 100), wider bars for better control, and a slacker, shorter stance for descending confidence. 鈥淚 never imagined a cross-country rig could be this self-possessed,鈥 marveled听one tester. Historically known for staid wheelsets, DT Swiss came out swinging with the carbon XRC-1200s, which are nearly as light听as road wheels yet exceptionally stiff. That said, we鈥檇 have liked for this rig to come with听a Fox 34 fork, which would have added only听a bit of weight: a few testers complained that the 32 felt anemic when pushed hard.
The Verdict: The Porsche Cayenne of mountain bikes.
Price $3,999 to $7,999 Weight 24.8 lbs
Viral Skeptic
Best For: Rediscovering a love for rigid rigs.听
The Test: From the mind of Niner founder Steve Domahidy, might be the plushest hardtail we鈥檝e ever ridden. The titanium tubes feel like they鈥檙e stuffed with Tempur-Pedic foam, and the three-inch WTB tires cut the rough like shag carpet. Inside the bottom bracket, the Pinion gearbox鈥攁 12-speed with almost double the range of today鈥檚 biggest 1×11 options鈥攑ushes a Gates Carbon Drive belt system. The result is a听well-geared machine that鈥檚 quiet and low maintenance, with a relaxed posture that makes easy work of even the techiest trails. SRAM鈥檚 new Level brakes proved reliable,听and the Race Face Turbine dropper is a great addition. Our only quibble: it鈥檚 quite heavy听at more than 30 pounds.听
The Verdict: An all-mountain play bike听for your inner geek.
Price $5,000 Weight 30.8 lbs
BMC Teamelite TE01
鈥Best For: Winning XC races in comfort.听
The Test: This carbon 29er is a race 颅weapon, but thanks to an elastomer bumper built high on the seat stays and designed to take the edge off the rough, it dismantled the trail, not our backside. The setup yields just 15 millimeters of vertical compliance (also known as frame flex, a measure of comfort). That doesn鈥檛 sound like much, but when one of our testers raced in a nine-hour en颅durance event, he experienced none of the backache or numb hands typical on a hardtail. Rear traction was grippier, too. The soft-tail design doesn鈥檛 affect weight鈥攖he bike tipped the scales at just 20 pounds, even with the bar-mount-controlled 100-颅millimeter Fox Float fork. And while the SRAM XX1 1×11 drivetrain is the right choice for a racer, the 30-tooth front ring left us spinning out on flats.听
The Verdict: Swiss precision and a touch of backside suspension equal a fast, surprisingly pleasant ride.
Price $4,599 to 10,599 Weight 20 lbs
Rocky Mountain Blizzard -50
Best For: Checking out the fat-tire trend.听
The Test: Slip-sliding down snowy singletrack on 听made us feel like a giddy kid with his first sled. 鈥淭his could make skis obsolete,鈥 one tester claimed. Yet, with its short reach, slack 67.6-degree head angle, and 120-millimeter RockShox Bluto fork, this bike is just as fun in the dirt, where the big tires smooth out rock gardens like steam颅rollers. The price is right, too, especially considering the solid Shimano SLX parts. We听do suggest upgrading the Sun Ringl茅 wheels and the 4.7-inch Bulldozer tires, which spin about as well as their heavy-machinery namesake. Replace them with something听stiff and light, like the carbon Reynolds听Dean and Bontrager Barbegazi.听
The Verdict: Big fun, and one of the sharpest-looking bikes in the test.
Price $2,599 Weight 33.1 lbs
Evil The Following
Best For: Shredders and 29er skeptics.听
The Test: With just 120 millimeters of rear travel, pedals like a hardtail but is more capable than far bigger bikes. The secret? The DELTA suspension (shorthand for Dave鈥檚 Extra Legitimate Travel Apparatus), the third system from bike guru Dave Weagle. 鈥淭he best shock tune out of the box I鈥檝e ever ridden,鈥 gushed one tester. 鈥淐onfidence inspiring in corners and way quicker handling than most 29ers, it makes you want to go fast.鈥 The build is equally inspired, with a 130-millimeter RockShox Pike fork and a stiff Race Face Next SL crank. But while we loved the handling of the Easton Heist wheels, we beat up the soft rims. If it hadn鈥檛 been for the advent of plus-size, the Following would easily have won Gear of the Year.听
The Verdict: The consummate all-around bike for those who like to hang it听out there.
Price $4,999 to 6,599 Weight 28.1 lbs
Devinci听Troy Carbon RR听
Best For: Pretty much everything.听
The Test: With 150 millimeters of travel and a moderate 67.5-degree head angle, . 鈥淚t just does what you want it to,鈥 raved one impressed tester. The parts range from excellent (the confident 150-millimeter RockShox Pike RCT3) to solid, though for the money the portly SRAM X01 crank and Avid Elixir 9 brakes underwhelmed. Still, the bike is reasonably lightweight even with those parts, allowing us to rail the Troy hard uphill and down鈥攚e even picked off a few Strava segments around Sedona, Arizona. It was especially popular with women and shorter riders, as the stand-over height听is low. Trade in your collection of bikes for听this one. We promise you won鈥檛 miss them.听
The Verdict: A true shape-shifter, 颅sprightly enough for all-day trail rides yet听rugged enough for enduro.
Price $2,399 to 6,599 Weight 27.5 lbs