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Speedplay is our best-selling brand of pedals by a ratio of 3:1. And that's 3:1 over all other pedal brands combined. With that thought in mind, we're excited about this Speedplay-specific version of the DMT Radial Shoe. The Radial is DMT's top of the line shoe for riders who eschew mechanical buckles, and this version of the Radial's CX carbon sole is specific to Speedplay cleats. That means no more 3-bolt to 4-bolt adapters! This lowers your stack height and gets your feet closer to the pedal spindle -- giving you better pedaling efficiency and a lower likelihood for hot spots.
Please Note: When mounting Speedplay cleats directly on these shoes it is imperative to use Speedplay’s Carbon Sole Wear Protector Shim. Failure to do so may damage the sole and will void the warranty. We also recommend using Speedplay's Long Cleat Screw Kit to ensure that your thread interface is sufficient to keep the cleats attached to the shoes during hard efforts.
Like the Look version, the Radial 's CX carbon sole is made from Toray MR60, which is a 40 Ton high modulus carbon fiber. That means it has a tensile strength of 40 tons per square cm. In other words, it's got stiffness in spades. Toray is one of the top manufacturers of carbon fiber world-wide -- it's the same stuff used by Pinarello in the Prince Carbon and Montello FP8. The lay-up of the carbon and the shape of the sole are exclusive to DMT.
The soles are made from 9 layers of carbon fiber molded at 0°, 45°, and 90° angles. Of course the sole must be looked at as a whole, but each angle in the carbon lay-up will offer strength in different ways:
- 0°: Maximum stiffness and responsiveness. This carbon fiber runs the length of the sole providing the stiffness overall for the entire sole.
- 45°: Torsional rigidity allowing a responsive and firm steering feel. It provides stiffness to prevent twisting of the sole due to pronation or supination. During the typical pedal stroke your foot will exert different forces at different vector angles to the sole. Without the torsional rigidity afforded by this layer, the sole would be able to twist along its axis leading to a loss of efficiency.
- 90°: Strength and durability for long life and consistent high performance. This layer of carbon fiber helps strengthen the overall form of the sole. Without it the sole wouldn't have the strength to withstand lateral forces. It also helps in increasing the torsional rigidity.
Another area where these soles excel is in their thickness - or in this case thinness. Keeping the distance between the bottom of the foot and the pedal interface as thin as possible increases the maximum transfer of power to the pedals through more of the stroke. The DMT CX carbon sole uses varying thicknesses in different places. But at the critical cleat interface it is a wispy-thin 3.5 mm allowing for an optimum foot to pedal distance.
The DMT Radial Shoe keeps the uppers wonderfully light and fairly traditional with a three strap system. The upper's microfiber combined with the soft mesh guarantees a comfy fit with a maximum amount of circulation. The bonded toe and heel protectors guard against those nasty scuffs that can result from a bit of clopping around the coffee shop parking lot. The Radial weighs 255g in size 41.