The crank is one of the most complex parts for aerodynamics; the leading edge of your shape becomes the trailing edge 180 degrees later, you have the major influence of the forward speed and the minor influence of the rotational speed, your feet spin by, the frame is right there, the chain runs over the chainring and can’t really be changed aerodynamically, etc.
Our best aero shape was a knife-like 12mm wide at the pedal, significantly thinner than anything else in existence (cranks are usually 15-17mm at the pedal end). In the other direction, our desired profile was much deeper than usual.
The transition to the spider is another headache area. For structural and stiffness reasons, we want the spider to be integrated with the crank arm and fibers running through both. Yet we also want the chainring to be separated spatially from the drive-side crank arm (not one blended shape) to avoid aerodynamic blockage. The Torno spider offers exactly that and works in unison with the dedicated Wolf Tooth aero rings.
NARROWQ: Narrow is aero and the ultra-thin crank arm blades provide a double advantage: They cut through the air more efficiently and the reduce the Q factor by 4mm, keeping your feet closer together for better biomechanical and aerodynamic efficiency.
DEDICATED 1X: The Torno is optimized specifically for 1x drivetrains. That allows us to use straight crank arms (no need to clear the front derailleur), which makes them more aero and lighter. It also allows for better spider integration. Perfect for your Strada or Exploro build.
LAYUP: Of course we can't reveal the exact layup, but we can say it’s not just a blend of different moduli but also unidirectional and woven materials. Unlike what you often see, this woven is not cosmetic but an integral part of the structure to achieve the Torno's incredible weight & stiffness.
CARBON AXLE: Unique to THM is the carbon axle directly integrated in the drive-side crank arm and spider. This is the stiffest and lightest design possible (and unfortunately, also the most complex and most expensive). But when only the best is good enough, this is the best.
AERO SPIDER: The spider is separated spatially from the drive-side crank for aerodynamic reasons. Structurally however it is integrated with the axle and crank arm as well as the chainring, not only through its four bolts but also via its (patent-pending) countersunk design.
WOLFTOOTH CHAINRING: These 1x-specific chainrings uses Wolftooth’s DropStop tooth pattern for the best performance. The countersunk bolt pattern is dedicated to the Torno spider, transferring your power not just via its bolts but also its shape for optimal power transfer.
Weight crank (+/- 3%)350g (175mm, crank arms, axle, spider)
Weight metal part30g (bolt, extractor, etc)
Weight chainrings79g (36t), 89g (40t), 110g (44t)
BB standards Fits any frame with one of the following BB shells: BB386EVO, BB30, Pressfit 30 (PF30), Shimano Pressfit, BBright, Italian threaded, BSA threaded (bottom bracket not included)
Spider BCDCustom aero spider & bolt pattern
Chainrings36, 40 & 44 tooth
Gear ranges with 3T 9-32 cassette36t chainring equivalent to 48-34 chainrings with 12-30 cassette
40t chainring equivalent to 53/36 chainrings with 12-29 cassette
44t chainring equivalent to 54/36 chainring with 11-26 cassette
Chainline47mm (optimized for 1x in combination with 142mm rear axle spacing)
Inner crank width118mm
Available lengths170, 172.5 or 175mm
Max. permissible total weight(rider+bicycle+luggage): 110kg (264lb)
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