Trek goes Girthy : Stache 29+ and Farley fat bike 27.5+
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The bike market is in state of complete turmoil: the combination of different wheel diameters and tire widths have sparked quite the controversy lately. At Sea Otter, Trek presented a bike with 29 inch wheels in widths between 2.8 “and 3.3”, the Stache 29+. This is a hardtail designed for trailriding or, more simply, having fun on the trails and taking advantage of increased traction from larger volume tires. 
Below you can see a comparison between different tires, with which Trek justifies the choice of 29+. Don’t forget that the “classic” 29″ bikes are the brainchild of Gary Fisher which could be a factor in whyTrek focuses on 29+ rather than 650b +. 
To keep them lively, but especially to make them rigid, Trek uses the Boost 148 in the rear and a 110 mm front. Perhaps the most interesting thing is the rear dropouts, which allow 29+, 29 and 27.5+ wheels, depending on the type of riding and which wheels and tires you have available in the garage. The length of the chain stays are adjustable between 405 and 420mm.
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The Stache is available with both a rigid fork and a Manitou Magnum Pro with 110 mm of travel based on the technology from the Mattoc and Dorado (available in 27.5+ and 29 +), and features Bontrager Chupacabra tires. Below you can see the various models in the range.
Geometry
Numbers from all bikes are represented below.
Trek Farley
The Farley is a new 27.5″ Fat Bike. Usually they are 26″, but Trek wanted to take advantage of the larger diameter wheels for traction and smooth roll over characteristics. Not only that, but given the greater footprint, the width of the tires can be reduced, saving weight. 
In order to keep everyone happy, this bike has adjustable dropouts that allow the mounting of 26 “wheels as well as 27.5”, with the chainstays varying from 440 to 455mm.
Trek says that the 26″ wheels with 4.7″ Bontrager Barbegazi (weighing 1305 grams each), lend themselves nicely to turning in the fresh snow and loosest terrain, while the 27.5, with Bontrager Hodag 3.8 “(1260 grams each) are well adapted to turns on trails with groomed snow and slightly firmer conditions.
The Farley is available with either a carbon frame, weighing 1,325 grams, or with an aluminum frame , weighing 1,935 grams. The fork is available two specs: the full carbon Haru Pro weighs 575 grams, while the Haru has an aluminum steerer and weighs 635 grams. 
To complete the bike, Trek has designed the Wampa carbon wheels, weighing 2,500 grams per pair: 83mm wide, with a diameter of 27.5+, tubeless ready and hookless.
The Farley is also even available in 24 “for children.
Fuel EX Junior
Talking of kids bikes, Trek has decided to dedicate a Fuel for young audiences : a Fuel EX for people from 135cm to 152 cm tall. The really interesting thing, beyond the small size, is the suspension tuning, designed specifically for those who weighs 30 to 50 kg. It has X-Fusion air suspensions, with a simplified lock-out and only two positions (open / closed). The wheels are 26 inch which is a bit on the larger side. the geometry has been adapted to follow suit.
New wheels and tires Bontrager
Among these innovations are also new tires and wheels from Bontrager. The Elite TLR Disc aluminum are available for both 27.5 “and for 29” and have an internal channel of 28mm, while the outer one is 33mm. Their weight is 1760 grams per pair for the 27.5 “and 1,878 grams for the 29” classic, while those with the Boost 148 and 110mm come in at 1,892 grams. 
These new wheels work nicely with the SE5 Team Issue tires , born from the G5 DH tire.
The Bontrager Plus 29+ aluminum aluminum rims feature internal and external widths of 39mm by 44mm respectively.
The Barbegazi come in up to 4.7 ” and weigh 1305 grams each.
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