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EB16: AX Lightness teases VIAL evo Gravel prototype

Introducing the New Vial Evo Gravel

Just a few weeks before Eurobike we got a sneak peek at the new lightweight cross country racer from AX Lightness – the Vial Evo XC hardtail with its 870g frame. Now the superlight carbon craftsmen at AX have finally let more details loose on a bike that we’ve know they were developing for sometime. The new Vial Evo Gravel aims to blend the trail performance of the XC with the speed and weight savings of their Ultra road bike. Coming in between but able to tackle any terrain, AX has set their goal of building the first complete production gravel bike under the 6.8kg UCI, and it seems they have hot that mark, even with up to 2.1″ tires. Take a closer look after the break as we get up close and personal with the new bike. At the same time we get another focused look at the XC bike, and how AX has simplified their frame and wheel lineups, and revamped a couple of crazy light saddles for more comfort…

VIAL evo Gravel

First, what we do know about the new Vial Evo Gravel is that it won’t be available until at earliest the beginning of 2017. The bike we see here was called a prototype, but looking closely, it is pretty clearly well finished and close to production. Our guess is that AX is done will their design and just working out finalizing the molds and and carbon ply layups across their full size range. The bike is a mix between the 700c road Vial and the 29er cross country Vial, so comes in between for tire sizes. That means that it is designed to fit up to a 700 x 40mm gravel tire or a 27.5 x 2.1″ trail tire. In either guise AX has plenty of lightweight wheel options to keep the complete bike light. We were told that this bike as it stood weighed just 6.7kg (14.8lb). The headtube of the gravel bike gets its looks derived from the road-going Vial Evo, but with a slightly more prominent looking taper. The Gravel is matched to a 3T Luteus II LTD fork, which as we’ve seen already has the matching big tire gravel clearance with their Exploro frame, but uses a 15mm thru-axle. The decision to stick with a single ring drivetrain means that the Vial Evo Gravel gets a clean cable routing setup. Both shift and brake lines share a single non-driveside cable port that uses a modular locking housing clamp to keep them from moving around or rattling inside the frame. That 6.7kg total weight is more impressive when we look at the drivetrain on this bike. While many of AX’s show bikes hit superlight targets through the use of boutique (read: expensive) carbon components and maybe even durability compromises throughout, this one uses a mostly stock SRAM Force1 groupset. OK, so those Ashima ai2 rotors shave some weight off, and who’s to say how they help braking. AX’s own cockpit components certainly won’t keep the price tag low, but they are said to be able to stand up to solid off-road riding abuse. But in the end this 1x specific gravel bike should be able to be built up with a fairly reasonable set of components and still roll away really light. The bike will use a 12mm rear thru-axle, of course with the same 142mm rear spacing of their XC bike. The seatstays on this bike are much thinner than the mountain bike suggesting a more compliant rear end for more time in the saddle. They also come together in a wide and flat seatstay bridge with a curious ridge in it the seems designed to control where the flex occurs (and away from the seat cluster.) The seat cluster also makes a great example to see how AX Lightness puts together a frame. Building individual assemblies of different parts of the bike, like individual tubes or stay assemblies, they then overwrap the joints by hand, often with a different type of carbon depending on stresses, as they finally are put into the mold to become one. Sticking with the 1x specific build the Vial Evo Gravel is able to keep its very asymmetric chainstays short and widely spaced to fit that fat rubber. It also leads to a bottom bracket cluster that provides a very broad connection for the wide downtube and seattube. That wide seattube, flattened front-to-back also suggests a focus on controlled flex and comfort at the saddle which meshes with the ever so slightly curve molded into the seatstays. Brake mounts on this prototype were post mount and 160mm rotor only, but AX didn’t have any answer as to whether those would carry over into the production bike. Overall frame weight is still a bit up in the air. Early claims set it at under 1000g. While that sounds fairly light for the rough and tumble life of a gravel bike that will encounter everything from smooth dirt roads to a fair share of technical trail riding, it’s a bit underwhelming for a bike from AX. (Remember that hardtail in the next image has an 870g frame.) The most recent notes we’ve heard from AX Lightness places frame weight for the new Vial Evo Gravel between 800-900g. That sounds more reasonable, and we can safely bet that they are working to get it to the lighter side of that range before it goes on sale to the public at the start of 2017.


We already got some details on the 3000€ Vial Evo XC frame, that had been more than 2 years in the making. The frame gets a long & slack modern geometry which should be a big help for stability on a bike that can be built up under 7kg/15.5lb. Anyone who has spent time riding a bike that light off road will have experienced it literally bouncing around on the trail just because of how light it is. The bike’s short headtube should allow for a low enough position, even for the most flexible racers over the 100mm 29er fork. The rear end os the bike is a noticeable departure from the other framse AX has developed. Like the Gravel which was partly developed out of lessons learned on this bike, the XC gtes asymmetric chainstays. Here the difference is less dramatic at first glance, but the driveside stay is much taller and thinner to get the best balance of power transfer and chainring/tire clearance. Both chain and seatstays also use thicker sections towards the front end of the bike, tapering to very thin profiles as they approach the drop out to allow for more flex. AX sees this as not just adding comfort to the rider, but for a more important performance benefit to let the rear wheel move a bit to better track the ground and provide improved traction without bouncing, again a big deal for an ultralight trail bike. The bike builds on the success of years of developing ever lighter Vial Evo road bikes. And to hit the design target of 427mm chainstays they spread the stays as far as they could and even curved the seattube on the 29er. Like the Gravel bike, the XC is also 1x specific, making no accommodation for a front derailleur. At the back the bike uses a light X-12 thru-axle as part of an all-new for AX dropout assembly. The bike sticks with 142mm rear spacing. It uses a captured nut post mount brake setup inside of the rear triangle with clean internal routing through the top of the chainstay.

VIAL evo Ultra & Race

On the road side of things, updates are pretty minor. The Vial Evo line up goes mostly unchanged for 2017, save for a much appreciated boost in tire clearance. With the explosion in popularity of wider tires, that might be seen as the reason for the update, but it is in fact the expansion in with of lightweight wheels. The move from 15mm internal rims to somewhere around 20mm becoming the new norm, riders on lightweight road bikes have been having clearance issues even when mounting 23 or 25mm tires. All of the new…



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