Trickle down tech: Trek brings IsoSpeed decoupler to aluminium Procaliber

Affordable XC racer gets mechanical pivot for better compliance

Trek’s IsoSpeed decoupler has been making the rounds on the brand's range of rigid trail and road frames, and now the American outfit has quietly added the mechanical pivot to is alloy Procaliber XC frames.

The higher end 9-series carbon frames received the IsoSpeed treatment a few years back, but the lower end Procalibers were left out to dry. But, now Trek has trickled the technology down into some of its more affordable models.

For those who have been living under a rock for the past couple of years, the IsoSpeed decoupler is a mechanical pivot that allows the entire seat tube to flex independent of the top tube, to take the square edge off of big and small hits, and all without sacrificing any rigidity or efficiency.

The new frame also sees Boost hub spacing, a PF92 BB, 100mm of travel (except for the 13.5in frame) and updated cable routing

This system works extremely well on Trek’s carbon bikes, though we’re yet to ride it on any of the brand's alloy frames — the Domane ALR4 Disc also has the mechanical pivot.

This comfort technology has made it to the Procaliber 8, Procaliber 6 and Procaliber Women’s. All three models are based around the same Alpha Platinum Aluminum frame in Trek’s G2 geometry and utilise the brand's ‘Smart Wheels Size’ system, with the 13.5in and 15.5in frames on 27.5in rolling stock and the larger sizes on 29er hoops.

The new frame also sees Boost hub spacing, a PF92 bottom bracket, 100mm of travel (except for the 13.5in frame, which has an 80mm fork), and updated cable routing to allow for a 31.6mm diameter dropper with stealth routing.

All three builds see a 2x11 Shimano drivetrain, RockShox forks and a fixed seatpost stock and all the Procaliber aluminium frames have a 300lb / 136kg max rider weight.

Procaliber 8

Trek has brought its IsoSpeed decoupler to the budget friendly alloy Procaliber frames
Trek has brought its IsoSpeed decoupler to the budget friendly alloy Procaliber frames

  • Frame: Alpha Platinum Alloy
  • Fork: RockShox Reba RL, G2 51mm offset, 100mm travel
  • Wheels: Bontrager Duster Elite 23, Boost front and rear
  • Tyres: Bontrager XR2 Team Issue, tubeless ready, 2.20in
  • Drivetrain: Shimano Deore/SLX 11spd w/ Shadow Plus derailleur
  • Cranks: Race Face Next R 36/26
  • Brakes: Shimano MT500 hydraulic disc
  • Bars: Bontrager Race Lite, 720mm width, 5mm rise
  • Stem: Bontrager Elite
  • Seatpost: Bontrager Pro OCLV Carbon, 31.6mm
  • Claimed weight: 11.45 kg / 25.25 lbs 17.5in frame
  • £TBC / $2,199 / AU$2,899

Procaliber 6 Women’s

The women's specific Procaliber 6 is almost identical to the men's/unisex version bar the cockpit and saddle. It also comes in a 13.5in frame size
The women's specific Procaliber 6 is almost identical to the men's/unisex version bar the cockpit and saddle. It also comes in a 13.5in frame size

The Women’s Procaliber 6 is almost identical to the Men’s/Unisex bike with the same G2 geometry, but sees slightly narrower bars, a women’s specific saddle and a 13.5in frame size

  • Frame: Alpha Platinum Alloy
  • Fork: RockShox Recon Gold SL, G2 51mm offset, 100mm travel
  • Wheels: Bontrager Duster Elite, Boost front and rear
  • Tyres: Bontrager XR2 Team Issue, tubeless ready, 2.20in wide
  • Drivetrain: Shimano Deore/SLX 11spd w/ Shadow Plus derailleur
  • Cranks: Race Face Aeffect Cranks 36/26
  • Brakes: Shimano M425 hydraulic disc
  • Bars: Bontrager Alloy, 690mm width, 5mm rise
  • Stem: Bontrager Elite, +/- 7-degree
  • Seatpost: Bontrager Alloy, 31.6mm diameter
  • Claimed weight: 11.43 kg / 25.20 lbs 15.5in frame
  • £TBC / $1,889 / AU$2,499

Procaliber 6

The Procaliber 6 comes in below $2,000 and sees the IsoSpeed decoupler
The Procaliber 6 comes in below $2,000 and sees the IsoSpeed decoupler

  • Frame Alpha Platinum Alloy
  • Fork: RockShox Recon Gold SL, G2 51mm offset, 100mm travel
  • Wheels: Bontrager Duster Elite, Boost front and rear
  • Tyres: Bontrager XR2 Team Issue, tubeless ready, 2.20in wide
  • Drivetrain: Shimano Deore/SLX 11spd w/ Shadow Plus derailleur
  • Cassette: Shimano SLX M7000, 11-42, 11-speed
  • Cranks: Race Face Aeffect 36/26
  • Brakes: Shimano M425 hydraulic disc
  • Bars: Bontrager Alloy, 720mm width, 5mm rise
  • Stem: Bontrager Elite, +/- 7-degree
  • Seatpost: Bontrager Alloy, 31.6mm diameter
  • £TBC / $1,889 / AU$NA

Procaliber frameset

The Procaliber will also be available as a frameset for £TBC / $1,099 / AU$NA and is claimed to weigh 4.4lbs / 2kg in a 17.5in frame.

Colin Levitch

Staff Writer, Australia
Originally from Denver, Colorado, Colin now resides in Sydney, Australia. Holding a media degree, Colin is focused on the adventure sport media world. Coming from a ski background, his former European pro father convinced him to try collegiate crit racing. Although his bright socks say full roadie, he enjoys the occasional mountain bike ride, too.
  • Discipline: Road, mountain
  • Preferred Terrain: Tarmac mountain climbs into snow-covered hills
  • Current Bikes: BMC TeamMachine SLR01, Trek Top Fuel 9
  • Dream Bike: Mosaic Cycles RT-1
  • Beer of Choice: New Belgium La Folie
  • Location: Sydney, Australia

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