Bastion Cycles Teases Crankset Equipped With 3D Printed Titanium SRM

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As an early adopter of titanium 3D printing in the bicycle industry, Bastion Cycles has been well positioned to benefit (and possibly suffer) from the increased adoption of the new manufacturing technology.

It was at last year’s Handmade Bicycle Show Australia that the local Melbourne-based company announced its first matching fork and cockpit, and now the company has teased a matching crankset with an SRM spider-based power meter. Origin.

Currently, the ‘BC01’ crankset is in an advanced prototype stage, with the 12-employee company using the Handmade show to get a feel for demand. With a third 3D printer coming in, they will finally have the bandwidth to produce smaller parts like this.

Now Bastion isn’t the first to produce a 3D printed titanium power meter crank – that title belongs to Verve and its InfoCrank 3D Ti. Similarly, UK-based Sturdy Cycles has already released a 3D printed titanium crankset, as has part-time manufacturer Stellar Performance. Bastion also created contract cranks for the Australian track team, a now infamous partnership.

Yet this crankset represents another example of continued integrated design from the next generation of niche custom bike makers. And in the case of this Bastion crank, the goal was to achieve both an excellent stiffness-to-weight ratio and consistent aesthetics for Bastion customers. Its design – according to Bastion designer Charlie Cranswick, has a shape inspired by the peregrine falcon – sounds like a perfect match with Silca’s bird of prey that happens to open drinks.

Obviously the use of additive manufacturing allows for a unique shape with a hollow construction, but there are other functional advantages as well. Namely, the unique manufacturing approach means that Bastion can accommodate a wide variety of crank lengths, ranging from 150-180mm in 2.5mm increments.

The hollow crank arms and spindle parts are titanium 3D printed in-house, with all contact surfaces and threads machined after printing. Likewise, the carbon tube that forms the center of the spindle is made by Bastion, a step away from 3D printers.

Bastion produces the cranks and spindle in-house. This spindle features titanium parts bonded to a carbon fiber center shaft. Photo: Bastion Cycles.

Power metering comes in the form of a Spider-based SRM Origin unit – a well-respected product, but without true independent left-right power metering (yeah… just opened that box of worms). The Spider features a 4-bolt 110BCD design that is intended for use with Shimano chainrings or Carbon-Ti (4-bolt) chainrings for SRAM AXS and Campagnolo users.

The spindle and cranks weigh 390 grams (172.5mm in length), a figure that excludes the spider and power meter rings. Bastion has yet to put the crankset through ISO testing, but it will do so in the coming weeks. The company currently estimates that the power-equipped crankset will cost AU$4,800 (about US$3,500), plus shipping and taxes. There’s no denying that’s a big number, however, it’s significantly less than Verve’s offering.

More information should be available soon on bastioncycles.com

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