The Fastest Alloy rim on the market.

Technical Specifications:

    • Weight: 485g +/-20g (Weight depends on hole drilling, Nipple type, and ceramic coating)
    • Available in 20H, 24H, 24H (2:1), 28H and 32H Drilling combinations
    • Internal OCL (Offset Crossed Lacing) available
    • A wind-tunnel proven aluminium alternative to deep carbon wheels
    • Manufactured to last, no cracking! Thanks to our AF9X alloy
    • Our welded joint ensures consistent braking, no rattling, easy tubeless setup, lower overall weight and increased joint integrity
    • Unique tubeless compatible design for tubeless setup and easy tire installation
    • Life enhancing ceramic coating available
    • Invisible weld, sandblasted matt black finish and laser engraving for understated elegance

Aerodynamics:

We designed our rims to be the most aerodynamic alloy rims on the market.  To demonstrate this bold claim, the Al33 has been independently tested at the A2 Wind-tunnel in the USA.  We have published the results below for transparency.

 

Windtunnel Test at different wind angles (Lower is Better)

At lower speeds and in windy conditions, higher yaw angles are more relevant.  At higher speeds on calmer days, shallower angles are more relevant.  The bar graph shows the percentage of time you can expect to spend at each angle.  The Al33 outperforms all high end aluminum competitors in all tested wind angles (0-20 degrees).  Amazingly, the Al33 also outperforms the much deeper, more expensive and heavier carbon alternative at low yaw angles.  The power saving from this profile against a tested aluminium alternative could amount to as much as 10 watts per rim.

Rim Profile:

Our toroidal shape combined with a wide inner bead allows for a higher volume of air.  A greater air ‘cushion’ significantly improves comfort and reduces the risk of pinch-flats. A wide, toroidal profile also increases lateral stiffness (side-to-side deformation). The profile provides lower aerodynamic drag and greater stability than traditional V shaped rim profiles.

There has been an almost wholesale adoption of toroidal rim profiles across carbon rim production because of their proven aerodynamic benefits.  However, we are the first manufacturer to bring this design to aluminum wheels without adding a weight penalty.

Our 26,2mm wide external rim allows for smooth airflow between the tyre and rim.  Such a transition allows for lower aerodynamic drag without resorting to much deeper, heavier and less stable profiles.

 


Offset Crossed Lacing Technique (OCLT)

Our rim extrusion design combined with internal nipples allows us to build wheels with our offset crossed lacing technique.  A technique whereby the spoke pulls to the hub from the far side of the rim, rather than the near side of centre.  This increases the spoke angle from the hub.  A higher lateral spoke angle means increased lateral stiffness (reduced side-to-side deformation) and decreased radial stiffness (up-and-down deformation). This results in the wheels being more stable when cornering, stronger when loaded and always more effective at delivering power and comfort.

Aforce AL33 Lateral Spoke Angle

In a conventionally laced wheel, the spoke angle is limited by the dimensions of the hubs. This is particularly problematic on a rear wheel. The spoke angle from the drive side hub flange is limited by the cassette. Applying the Offset Crossed Lacing Technique(OCLT) spoke holes are placed 2mm further from the hub flange. This results in a higher spoke angle and notably higher lateral stiffness.  On road wheels, almost without exception it increases the drive side bracing angle by more than 10% and generally by 12.5%+.

Spoke holes are drilled with a 2mm offset for lateral stiffer wheels

Ceramic Braking Surface

Faster braking means later braking.  If you can brake harder and later you can out-pace those with inferior stopping power.  The Al33 can be supplied with a ceramic coating applied to the brake surface. This increases the braking power and improves modulation if compared to standard aluminum and provides even greater disparities against carbon bicycle rims.  This is the case in both wet and dry conditions.

The ceramic coating itself is dark grey in appearance.  It makes the appearance of the rim more understated and allows these aluminium based wheels to look more similar to their carbon counterparts. We advise the use of our ceramic coating with our ceramic specific brake-pads for optimum braking performance and durability.

 

Ceramic Braking Surface

AF9X-T6 Alloy

Creating a durable aluminum rim with comparable aerodynamics and weight of its carbon counterparts was challenging. To achieve this, we needed to use a superior aluminum alloy. 6061 or similar alloys failed to provide the strength and stiffness we required. Our AF9X alloy delivers a broad spectrum of improvements over 6061 allowing us to expand the potential of rim. We were able to make the rims lighter, stiffer, more durable and suitable for every rider in all conditions.

6061 compared to AF9X

Tubeless Optimised Design

Tubeless tyres provide a range of benefits over tyres with innertubes. Tubeless tyre technology is already the industry standard for motorcycles, cars and mountain bikes.  Further developments in tyre technology has now allowed the application of a tubeless design onto road bikes.

Tubeless technology eliminates the need for an inner tire. This eliminates the chance of pinch flats and reduces tyre rolling resistance dramatically.  Lower rolling resistance means greater speed for less effort!  Tubeless tyres are more easily installed than tubular tyres, they also can heal punctures with their sealant.  A tubeless setup is commonly lighter than a tube plus tyre setup.

If a tubular tyre punctures, there is a risk that you may be stranded.  With a tubeless tyre, small leaks are automatically sealed by liquid latex. If the puncture is too big to mend itself, you can simply put in a spare inner tire to continue your ride, like you would have done with traditional clinchers.

 

Rolling resistance in Watts

A lot of development has gone into the tubeless rim shape of the Al33, when installing the tubeless tire for the first time there is no need for an air-compressor.  A conventional track pump will suffice. The tyre will pop into place and will stay in place (even when the tyre is deflated). The middle section is deeper than a lot of other rims    to make the installation effortless.  There is no requirement for any specialist tooling or excessive amount of force.

If you would prefer to continue with a traditional clincher setup with innertubes, you can continue to do so with the Al33. Our tubeless optimised design is reverse compatible.

 


Hidden internal Spoke-Nipples

The spoke nipple is a natural weak point in a bicycle wheel. The stress is concentrated at the contact area of the nipple and bicycle rim, making the nipple prone to cracking over time.

For this reason, it is our recommendation to use internal nipples instead. Due to the internal design, forces are equally divided over the nipple, making it more resilient. The contact patch internally in the rim is doubled because the whole required to accommodate the spoke alone much smaller. This decreases the stress on the rim.

 

Internal nipple design

For our super-stiff option, we use an extra nipple washer for an even bigger contact area. This makes the wheels strong enough for the heaviest riders under the toughest conditions.

Internal nipples also provide an aerodynamic advantage as the air passes more smoothly around the much smaller spoke.  It also raises the aero portion of the spoke closer to the rim profile.