The world’s thinnest crank arms to slice through the air.
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.
Quite simply, there is only one company in the world that is technically capable to make a crank this thin, this stiff and this light. Luckily, that's our sister company, THM. After all, they’ve been building the world’s lightest cranks for 20 years right in their German factory.
So together, we built a new carbon factory in Bergamo, Italy, and that is where we produce the Torno from scratch. That means raw carbon fiber and resins come in, and after a series of proprietary technologies and with a lot of craftsmanship, the world’s most beautiful cranks (if we may say so ourselves) ship out to you.
Thanks to this in-house manufacturing, the Torno is the world’s second-lightest crank despite being so thin and aero (THM’s own Clavicula SE is the lightest). That simply would not be possible anywhere else.
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.
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.
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.
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.
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.
Crank Weight (+/- 3%): 300g (175mm, crank arms, axle, spider)
Weight metal part: 30g (bolt, extractor, etc)
Chainring Weight: 79g (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 BCD: Custom aero spider & bolt pattern
Chainrings: 36, 40 & 44 tooth
Chainline: 47mm (optimized for 1x in combination with 142mm rear axle spacing)
Inner crank width: 118mm
WESTBROOK CYCLES DELIVERY NOTICE
FREE when you spend over £50.00 in a single order
Otherwise it's typically £3.99 per order
Delivery should be expected between 2-3 working days unless stated on product page.
Approximately 4-10 working days depending on country
via Parcelforce Signed Delivery (fully traceable service). Please add items to the basket to calculate delivery for desired country.
If your country isn't listed for delivery at checkout please contact us.
Delivery of Bikes
We ship all our bikes free of charge within the United Kingdom (excl. Jersey and the Channel Islands at this time) and all our bikes come pre-assembled with just a few tweaks required (Please see our Bike Build Instruction page for details of assembly required).
All our bikes undergo a safety check before being re-boxed for shipping which can during busy periods take a little longer to complete so whilst we aim to ship all our bikes within two working days of the order please allow for additional time for this process.
All our consignments irrespective of the carrier require a signature upon delivery, deliveries are typically made between 08:00 and 18:00 so please bare this in mind when choosing a delivery address.
We do try when possible to reuse packaging from our own suppliers in order to send purchased items to our customers, we ask if the packaging is still in good condition after you've received your goods then please try to use it again or recycle if not possible.