The new Trans-Fat features the same front triangle as the Tranny 29.

The new Trans-Fat features the same front triangle as the Tranny 29 (click to enlarge).​

Editor's Note: This article is part of the Mtbr Ultimate Guide to winter mountain biking, fat bikes, gear, apparel and trainers. In the first two months of 2016, we are taking a deep dive into all manner of cold weather mountain bike gear, with round-ups and reviews of fat bikes, tires, wheels, apparel, trainers and more. To see all the articles, head over to our Winter Guide Hub Page.

Ibis Cycles is increasing their carbon footprint with the latest in a lineage of cleverly named bikes - the Trans-Fat. Thanks to its removable rear triangle that allows for easy packing for airline travel, as well as the ability to run belt drive, singlespeed or geared setups, the Ibis Tranny 29 is already a highly versatile bike. And with the announcement of the Trans-Fat, the Tranny can now serve as a bona-fide fat bike.

A wider rear triangle accommodates a four-inch fat bike tire.

The wide rear triangle accommodates a 4" fat bike tire (click to enlarge).​

Using the same front triangle as the Tranny 29, the Trans-Fat features a new rear triangle that accepts 4" fat bike tires, a 177mm x 12mm Maxle thru-axle, 3mm crown race for proper axle to crown height, and a bottom bracket adapter to fit a 100mm BSA bottom bracket.

A spindle adapter fits a 100mm wide bottom bracket.

A spindle adapter fits a 100mm wide bottom bracket (click to enlarge).​

The Trans-Fat also includes little details that have made the Tranny 29 such a hit, including internal dropper post routing and multi-option internal cable routing. And with the introduction of the Trans-Fat comes a new color - metallic orange. The Trans-Fat can also be had in matte black.

The Trans-Fat is on the sportier, more aggressive end of the fat bike spectrum. Photo by James Adamson - dropmedia.tv

The Trans-Fat is on the sportier, more aggressive end of the fat bike spectrum (click to enlarge). Photo by James Adamson - dropmedia.tv​

I got a chance to ride the Trans-Fat the day after a fresh snowfall in Truckee, California. Thanks to its 4" wide tires, lightweight 3.25-pound frame, relatively short 452mm chainstays, and 70-degree head tube angle, the Trans-Fat is definitely on the more aggressive and nimble end of the fat bike spectrum. This combination of light weight and nimble geometry makes the Trans-Fat a capable climber and confident descender. Unfortunately, I wasn't really able to ride the Trans-Fat for more than a couple hours, but I can definitely say that it rides like a fat bike, albeit a very agile and quick fat bike, for whatever that's worth.

 A 70-degree head tube angle and 452mm long chainstays make the Trans-Fat fun to loft over snow drifts. Photo by James Adamson - dropmedia.tv

A 70-degree head tube angle and 452mm long chainstays make the Trans-Fat fun to loft over snow drifts (click to enlarge). Photo by James Adamson - dropmedia.tv​

Besides how it rides, the bigger story here is versatility. With one front triangle and two rear triangles, you can have a geared cross-country hardtail, a sub-20 pound singlespeed with belt drive capability, a geared fat bike, or a singlespeed fat bike with belt drive capability. And don't forget its ability to disassemble into two pieces, making it fit into a small suitcase to avoid oversize airline baggage fees.

Continue to page 2 for more on the new Ibis Trans-Fat fat bike »

The Trans-Fat getting some fresh pow. Photo by James Adamson - dropmedia.tv

The Trans-Fat getting some fresh pow (click to enlarge). Photo by James Adamson - dropmedia.tv​

The Trans-Fat will be available in three builds: as a complete fat bike with a 1x Shimano XT kit and 120mm Rock Shox Bluto fork ($5,099), as a frameset ($1,700), or as a retrofit kit ($699). According to Ibis, they have extremely limited quantities available now, with a second run available in early February.

For those who already own a Tranny 29, the Trans-Fat retrofit kit includes the rear triangle and bottom bracket adapter, and will bolt right up to any Tranny 29 front end. The Trans-Fat webpage on the Ibis site walks owners through the transition between summer hardtail and winter fat bike, and specifically details how owners should install the bottom bracket spindle adapter to prevent frame damage.

 The Trans-Fat shares many of the same agile handling characteristics as the Tranny 29, only with more cush. Photo by James Adamson - dropmedia.tv

The Trans-Fat shares many of the same agile handling characteristics as the Tranny 29, only with more cush (click to enlarge). Photo by James Adamson - dropmedia.tv​

The Trans-Fat with the 1x11 Shimano XT build kit is nicely equipped, featuring 26"x4.0 Schwalbe Jumbo Jim tires on SunRingle Mulefut 8SL rims, Race Face Turbine Cinch cranks with 30t chainring, a KS LEV Integra dropper post, 760mm Ibis Carbon Handlebars and choice of either a 40-60mm Thomson stem or a 60 or 70mm Ibis stem.

The Trans-Fat is available in a new metallic Orange color or matte Black. Photo by James Adamson - dropmedia.tv

The Trans-Fat is available in a new metallic Orange color or matte Black (click to enlarge). Photo by James Adamson - dropmedia.tv​

For those who own a Tranny 29 and don't want to spend the coin for a dedicated fat bike that might collect dust for half the year, the introduction of the Trans-Fat has made the prospect of building a fat bike a little more practical and enticing. Plus, the outstanding handling characteristics of the Tranny 29 will carry over to the Trans-Fat, albeit with just a bit more heft and cush. And for some riders, more cushin' for the pushin' is just what they're seeking.

Get all the details at the www.ibiscycles.com.