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AX-Lightness
Premium 38T Tune Hub Tubular Wheelset

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The everywheel.

The AX-Lightness Premium 38T Tubular Wheelset uses the Stream 38 rims, which enjoy a profile informed by the same fluid dynamic considerations AX-Lightness pours into its motor sport designs. They swell to 26 millimeters at their widest and terminate in a blunt, round shape rather than a point. This keeps unruly laminar air in check as it travels across the rim's surface, eliminating pockets of dead air. It also refuses crosswinds any purchase for handling that remains consistent and predictable under changing conditions. As far as handling is concerned, these are bordering on being the perfect wheels.


While that combination of aerodynamics and handling in crosswinds eliminates the typical drawbacks of deep rims, stiffness and weight are still important aspects of any racing wheels. AX-Lightness uses a carbon weave for the Stream rims because, unlike the ubiquitous unidirectional fibers of late, a woven fabric has load-bearing properties that recommend it for a wheel's rim, which experiences dynamic directions of pressure as it spins. This means efficient power transfer and torsional stiffness can be achieved with less material, which in turn results in less weight.


The Premium 38Ts enjoy the universal technology of rim construction that defines AX-Lightness, including AX-Lightness's Seamless Brake Surface (SBS). SBS uses high-pressure autoclaves to combine the wheels' layers with gas, eliminating any imperfections down to the smallest edge for a one-piece brake surface that's both seamless and virtually free of imperfections. It may look like a typical, mass-production rim, but the Premium's Stream 38 rim is nearly perfect on a microscopic scale after it's cured, so there's no shuddering while braking during descents. After curing, the wheels are tempered, which realigns the resin crystals to drastically increase the braking temperatures that they can withstand before the carbon softens and deforms.


The wheels' reliability is also boosted by Spoke Reinforcement Technology, which creates the spoke holes during the manufacturing process itself. There is no post-production drilling once the rims come out of the autoclave, so there's no additional structural weakness. As a result, the Premium 38Ts can bear five tons of nipple resistance, which AX-Lightness takes advantage of by tensioning the spokes to 1300 N.


The hubs are also German affairs, straight out of the Black Forest: Tune's Mig45 front and Mag150 rear. The flanges are reduced and wrapped in carbon, which makes for a lighter hub. Except for on the rear drive side, the flanges aren't oversized like you'd expect from a low-weight, high-power wheel, but the carbon reinforcement serves to stiffen them up considerably.


Please note that AX-Lightness recommends a rider weight limit of 220 lbs. (100kg).


Material
carbon
Rim Width
26 mm
Rim Depth
38 mm
Front Hub
Tune Mig45
Rear Hub
Mag150
Spokes
DT Swiss Aerolite
Front Spoke Count
20
Rear Spoke Count
24
Brake Compatibility
caliper
Complete Set Weight
1015 g
Recommended Use
road racing
Manufacturer Warranty
1 year limited

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