This is a rim I’m really excited about, the new A36D from Nox Composites. This is the first carbon fiber tubeless ready disc brake road rim available for custom builds. This is a great option for disc road bikes, as well as ‘cross or ‘gravel’ or ‘all-road’ type bikes as well.
OUTER WIDTH: 28mm
INNER WIDTH: 20.5mm
The A36D rims have a modern blunt U cross sectional aero shape designed to be low drag and also not a handful in crosswinds, and with the 36mm depth these are certainly daily driver rims, not extra deep race day only hoops – you won’t get blown all over the road on windy days. Like all Nox rims they have an offset spoke bed, which raises the spoke tension on the low-tension side of the wheel. This increases the load capacity of the wheel and the durability as well – with the spokes at a higher tension there is less chance of them being overloaded and going slack, which leads to fatigue and failure as well as nipples backing off and wheels going out of true. With a generous 20.5mm inner width they will open tires up for extra volume, allowing less air pressure to be used for a faster and smoother ride and more traction and improved feel in the corners.
With a target weight of 425g (mine were both 440g) they are not super light, there’s plenty of alloy rims in the same weight range. The alloy rims are not as deep however, nor are they as stiff. Up until this point Nox has only produced mountain bike rims, and some of that design ethos is in these as well – they’re a bit burly. Some aero road rims you can squeeze the sidewalls with your fingers and feel them flex, not so with the A36D. The extra material and strength will be appreciated when a rock flips up and hits the top or side of the rim at 30mph.
As I mentioned earlier the rims are tubeless ready, and have Nox’s anti-burp bumps molded into the bead seat to help keep tires in place at low pressures and high cornering loads – looking at you ‘cross racers! Unlike most carbon MTB rims, these do have bead hooks. However, the hooks are molded in place when the rim is made – not machined out afterwards like most rims. Machining cuts fibers and reduces strength, not to mention wastes material. There is also a little platform for the valve lock nut to tighten against, and it’s molded in as well, unlike Nox’s MTB rims which use a glued on piece.
Like all Nox rims, the price on this rim is competitive. Here’s an few build options to give you an idea of pricing and built up weights. Please note: the prices are current as of today but are subject to change. Weights and prices will vary for your specific wheels depending on the exact components used that best fit you. Prices include rim tape and tubeless valves, but do not include sales tax or shipping. These are all built with Sapim CX-Ray spokes and alloy nipples. Weights are approximate.
- White Industries CLD hubs, 24/24 spoke count – $1613 – 1500g
- Industry Nine Torch Classic Disc Road hubs, 24/24 spoke count – $1690 – 1455g
- Shimano CX75 hubs, 28/28 spoke count – $1361 – 1626g
- DT Swiss 350 Centerlock hubs, 28/28 spoke count – $1468 – 1563g
The A36D is a disc brake specific rim – there is no brake track, and high temperature resistant resins were not used. Nox is working on a rim brake version however, and they are experimenting with different resins and brake track treatments and designs. A symmetric rim brake version will also be available for use on front wheels.