So Dynalast isn’t just for road shoes anymore, but just what is Dynalast? Introduced last year for the top of the line Shimano road shoes, Dynalast is a new shoe last that was designed to increase pedaling efficiency. Thanks to the new Shimano Dynamics lab portion of their new fit system, Shimano was able to use the data provided to create a last that is .56% more efficient and offers 5% less braking loss. In layman’s terms it means more power to the pedals with less stress to your legs. More than just Dynalast, the new XC line offers improved fit, materials, and typical Shimano quality.
What do the new shoes weigh in at? Find out next.
At the heart of the Dynalast equipped XC90 is a new carbon sole that is thinner (and lighter) than previous models but still just as stiff. Changes to the pedaling efficiency and braking angle were made by decreasing the toe spring and increasing the heel angle. Combined with a one piece heel cup and a Revenica leather upper that won’t stretch, the XC90 promises to make the most of the energy you put to the pedals.
New for the XC90d and their mountain shoes in general is the mountain bike specific Cross X Strap. The middle Velcro strap now travels the opposite direction to better cinch the upper together. The XC90 still features a traditional Shimano buckle for the upper strap and Velcro for the two lower straps. My size 42s weighed in at 337g per shoe or 674g per pair which is just slightly more than Shimano’s claimed 627g. My m315s were slightly more than claimed as well, meaning the XC90s are still probably lighter than the 315s.
Shimano has taken a page from the Pearl Izumi book when it comes to adjustable insoles and the shoes come stock with heat moldable insoles with two interchangeable arch supports.
Like the rest of Shimano’s high end shoes, the shoe itself is heat moldable as well, but has to be done through your local Shimano dealer.
The only exposed carbon on the sole is directly under the cleat (still under a clear, with the stiffness to 11), with the rest of the tread offering translucent lugs and a pedal shank that look like they will hold up well. Replaceable toe spikes will help in muddy climates and include metal spikes in the box.
Dynalast is also extended to the rest of the XC line with the XC70 and XC60’s replacement, the XC61.
Right off the bat, for me the XC90s mark a noted improvement over the m315s. The fit is much better, allowing me to drop a half size due to an improved toe box shape. I will need to get them hear molded to be sure, but so far I’m really liking the new kicks.