Trek Neko Mually Custom 4x Bike (9)

Trek has a history of producing one-off 4x or slopestyle frames for their athletes and Neko Mulally’s current 4x ride is no different. Made from aluminum, the short travel racer looks to borrow a bit of DNA from other Trek mountain bikes in the form of different tubes welded up to make one completely different bike. Neko’s bike, like a few others in the pits, was also running some prototype Bontrager tires. Originally spotted without a shock and a front wheel, Trek’s own master mechanic Monk was nice enough to put it together so we could take a few shots.

Get a closer look after the break.

Trek Neko Mually Custom 4x Bike (26)

Though Neko is not on the Trek C3 team, the insignia cast into the seat tube is likely due to tubes first being used to build slopestyle frames for the likes of Cam McCaul and the rest of the C3 crew. Most people wouldn’t even know this was there as the shock is usually obscuring it from sight.

Trek Neko Mually Custom 4x Bike (8) Trek Neko Mually Custom 4x Bike (3)

Suspension is taken care of with Trek’s own ABP/Full Floater system with a rocker link that looks like it could have come from a Top Fuel due to its size.

Trek Neko Mually Custom 4x Bike (7)

Compare that to the massive chainstays which are definitely reminiscent of the stays on a Session. Bottom bracket is a Shimano Press Fit with ISCG tabs for the chain guide.

Trek Neko Mually Custom 4x Bike (6)

A tapered head tube and Fox Float CTD are enough to keep things in line on the course.

Trek Neko Mually Custom 4x Bike (1)

Out back there is a thru axle rear end, which is likely 142×12.

Trek Neko Mually Custom 4x Bike (2)

TWR is sponsored by Funn for everything cockpit related, so a Funn Fatboy bar and stem are found on Neko’s bike.

Trek Neko Mually Custom 4x Bike (4)

 On the back of this 4x bike was a Bontrager prototype tire that looks like it could be a new dry conditions semi slick.

Trek Neko Mually Custom 4x Bike (5)

 The center knobs are very shallow giving some bite, but keeping rolling resistance to a minimum. Appearing as if the knobs had been cut down, the team is likely experimenting with knob height and ramping to come up with the best tire for certain conditions. The entire negative space of the tread pattern has triangular siping, and the side knobs are aggressive blocks like you would find on the XR4.


  1. I hate when trek do bikes you cant really buy! What is the point of that?!?! The bike looks awsome, and I would like to bought one, but I cant…

  2. One again Trek continues to make frames available to their athletes that we consumers cannot get. At times like this I almost wish that the UCI rules for road biking applied to 4X and slopestyle bikes, particularly the one where racers have to be riding on bikes that are available to the public.

  3. Seraph, be careful what you wish for, the joy of mountain biking tech regs is the distinct lack therof. If I remember correctly the BCF regs for mountain bikes for XC and downhill were; must have two wheels, two brakes, covered bar ends and no mechanical assistance, anything else was fair game.

    Compared this to UCI road cycling where everything is covered by such ridiculous controls (eg lawyers lips on forks or not)

  4. Bogwolf, I think you misunderstand me. I am only complaining that Trek has so many athletes on bikes that they refuse to produce for consumers. The closest they have gotten was the Ticket Signature, which was far too short-lived.

What do you think?