Skip to main content

Sea Otter 2012: Praxis Works add new chainrings and BB adapters

Image 1 of 17

Praxis Works announced new time trial chainrings at the Sea Otter Classic. Just a single 54/42-tooth combination is available now but a 55/42t set is coming soon

Praxis Works announced new time trial chainrings at the Sea Otter Classic. Just a single 54/42-tooth combination is available now but a 55/42t set is coming soon (Image credit: Jonny Irick)
Image 2 of 17

This is how a Praxis Works forged chainring begins its life

This is how a Praxis Works forged chainring begins its life (Image credit: Jonny Irick)
Image 3 of 17

The chainrings on Praxis Works' new Turn carbon fiber crankset are actually one piece of aluminum, attached to the stout arms and chainring by five bolts

The chainrings on Praxis Works' new Turn carbon fiber crankset are actually one piece of aluminum, attached to the stout arms and chainring by five bolts (Image credit: Jonny Irick)
Image 4 of 17

The burly chainring spider and one-piece dual chainrings should make for incredible stiffness and fantastic shifting on Praxis Works' new Turn carbon crank

The burly chainring spider and one-piece dual chainrings should make for incredible stiffness and fantastic shifting on Praxis Works' new Turn carbon crank (Image credit: Jonny Irick)
Image 5 of 17

Target weight for Praxis Works' awesome new all-carbon road crankset is a feathery 600g with chainrings and bottom bracket

Target weight for Praxis Works' awesome new all-carbon road crankset is a feathery 600g with chainrings and bottom bracket (Image credit: Jonny Irick)
Image 6 of 17

The monstrous carbon fiber crankarms and huge 35mm-diameter spindle of Praxis Works' ultralight new road crank suggest incredible stiffness

The monstrous carbon fiber crankarms and huge 35mm-diameter spindle of Praxis Works' ultralight new road crank suggest incredible stiffness (Image credit: Jonny Irick)
Image 7 of 17

Praxis Works fitted this prototype set of modular carbon fiber cranks with a Truvativ GXP splined spindle

Praxis Works fitted this prototype set of modular carbon fiber cranks with a Truvativ GXP splined spindle (Image credit: Jonny Irick)
Image 8 of 17

Praxis Works also showed off a new set of Turn modular cranks with carbon fiber arms

Praxis Works also showed off a new set of Turn modular cranks with carbon fiber arms (Image credit: Jonny Irick)
Image 9 of 17

Praxis Works' director of marketing and sales Adam Haverstock wouldn’t disclose the fabrication process for the new Turn hollow-forged aluminum cranks but it looks like there's some sort of internal mandrel that's later melted out through a drain hole near the bottom bracket end of the arm

Praxis Works' director of marketing and sales Adam Haverstock wouldn’t disclose the fabrication process for the new Turn hollow-forged aluminum cranks but it looks like there's some sort of internal mandrel that's later melted out through a drain hole near the bottom bracket end of the arm (Image credit: Jonny Irick)
Image 10 of 17

Praxis Works' sister company Turn debuted new hollow forged aluminum cranks at Sea Otter with modular spiders for use with various chainring standards

Praxis Works' sister company Turn debuted new hollow forged aluminum cranks at Sea Otter with modular spiders for use with various chainring standards (Image credit: Jonny Irick)
Image 11 of 17

Praxis Works showed what we feel is the most thoroughly designed BB/PF30-to-24mm bottom bracket adapter currently on the market

Praxis Works showed what we feel is the most thoroughly designed BB/PF30-to-24mm bottom bracket adapter currently on the market (Image credit: Jonny Irick)
Image 12 of 17

The Praxis Works BB/PF30 bottom bracket adapter uses a collet system that wedges itself tightly inside the shell with even pressure throughout

The Praxis Works BB/PF30 bottom bracket adapter uses a collet system that wedges itself tightly inside the shell with even pressure throughout (Image credit: Jonny Irick)
Image 13 of 17

New from Praxis Works is a range of single chainrings with one-tooth jumps from 32-38 teeth

New from Praxis Works is a range of single chainrings with one-tooth jumps from 32-38 teeth (Image credit: Jonny Irick)
Image 14 of 17

Praxis Works' new mid-compact 52/36t chainring set is scheduled to ship by June 1

Praxis Works' new mid-compact 52/36t chainring set is scheduled to ship by June 1 (Image credit: Jonny Irick)
Image 15 of 17

Color matching on the Praxis Works chainring bolt caps for Shimano Dura-Ace 7900 cranks isn't quite perfect but it's pretty close and much better than just leaving the tabs bare

Color matching on the Praxis Works chainring bolt caps for Shimano Dura-Ace 7900 cranks isn't quite perfect but it's pretty close and much better than just leaving the tabs bare (Image credit: Jonny Irick)
Image 16 of 17

Praxis Works have released a new chainring set for Shimano Dura-Ace 7900 cranks, complete with profiled caps and special bolts for a finished appearance

Praxis Works have released a new chainring set for Shimano Dura-Ace 7900 cranks, complete with profiled caps and special bolts for a finished appearance (Image credit: Jonny Irick)
Image 17 of 17

External bottom bracket cups allow the 35mm-diameter spindle of the new Turn carbon crank to fit into a bike with a conventionally threaded bottom bracket

External bottom bracket cups allow the 35mm-diameter spindle of the new Turn carbon crank to fit into a bike with a conventionally threaded bottom bracket (Image credit: Jonny Irick)

This article originally published on BikeRadar

Praxis Works' impressive range of forged chainrings grows by several models for 2013. In addition to the new Shimano Dura-Ace 7900 and single-speed rings covered a few weeks ago, the company have released 130mm BCD time trial chainrings in 54/42-tooth combinations (with 55/42t to follow) and a new mid-compact, 52/36t set. Also in development are 29er-specific mountain bike chainrings with lower ratios to help offset the bigger wheels.

The company aren't only about chainrings, however – they also make the most thoroughly thought-out BB/PF30-to-24mm bottom bracket adapter we've seen yet. Far from just a pressed-in sleeve with threads for conventional cups, the Praxis Works adapter builds the sleeve and one of the cups as one piece. The end of the sleeve is internally threaded but also slotted several times around so that when the other cup – which is slightly tapered – is threaded in, the sleeve expands against the inside of the shell like a collet, locking it in place and preventing creaking like simpler press-fit designs. Larger-diameter PressFit 30 bottom bracket shells require only an additional aluminum sleeve, which is included at no additional cost.

New cranks, too

Praxis Works have a sister company, Turn, who design and manufacture their own cranks. New for 2013 are fully modular models with either hollow forged aluminum or carbon fiber arms, both of which can be used with different chainring spiders as necessary. Target weight for the hollow forged aluminum cranks is under 750g for a complete compact set with bottom bracket. Swapping in carbon arms will shave off 50g.

Far and away the most intriguing model in the range, however, are the prototype all-carbon Turn road cranks with huge arms, a massive chainring spider supporting a clever one-piece dual chainring, and a gigantic 35mm-diameter carbon fiber spindle rotating on externally located bearings.

According to Praxis's director of marketing and sales, Adam Haverstock, target weight for the all-carbon cranks is around 600g – about 100g lighter than the previous iteration, which was all machined aluminum. The real draw, however, will be their incredible stiffness. Pedaling efficiency should be among the best in the industry with the enormous arms and spindle but the stoutly reinforced spider arms – plus the hidden fourth arm design – combined with Praxis Works' well-engineered chainring pins and ramps should yield fantastic shifting, too.

Haverstock wouldn't even guess on a timeline for the all-carbon cranks and suffice to say we don't expect these will be cheap. That being said, we're still looking forward to trying them out someday regardless.

Target weight for Praxis Works' awesome-looking all-carbon road crankset is a feathery 600g with chainrings and bottom bracket