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Pro Bike Check: Hattie Harnden’s Trek Slash w/ prototype RockShox ZEB at EWS Tweed Valley

hattie harnden trek slash tweed valley ews 2021
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Hattie Harnden finished up the 2021 Enduro World Series placed 4th in the Overall, not bad for your rookie season in the Pro category. Following wins at Loudenvielle and La Thuile, Hattie finished the season very strong, coming in 2nd at EWS Tweed Valley, just 00.32 seconds behind winner, Bex Baraona – the tightest women’s racing the EWS has ever seen.

The season finale was on home soil for Hattie, with the weather bringing true British conditions for the riders to contest with; mud of peanut butter-like consistency, high winds and more sniper roots that you can shake a stick at. We got the details on Hattie’s race day setup, including a sneak peak at a certain as-of-yet unreleased RockShox ZEB fork.

Pro Bike Check: Hattie Harnden’s Trek Slash

hattie harnden trek slash 2021 ews tweed valley pro bike check
The Reactiv Thru-Shaft shock on Hattie’s Trek Slash has a Light High Speed Compression custom tune

At 174cm tall, Hattie Harnden rides the M/L 2021 Trek Slash (170mm dropper) with the geometry set to the low-position by virtue of the mino-link at the seat stay-rocker interface. That gives her ride a 64.1° head angle, a 469mm reach, paired with a 437mm rear end and a 345mm bottom bracket height.

hattie harnden pro bike check trek slash
Hattie’s Trek Slash was fitted with an SRAM XX1 AXS drivetrain with a 10-50T Eagle cassette and a 32T chainring fitted with a Quarq PowerMeter to help her manage her efforts on the time neutral liaisons

RockShox suspension delivers 170mm travel up front and 160mm in the rear, the latter delivered by the Trek-specific RockShox Super Deluxe Reactiv Thru-Shaft shock. Weighing 73kg, Hattie runs 175 PSI in the rear shock with 2 tokens. She runs zero clicks of compression damping, with the rebound set to 14 clicks from slowest. 

hattie harnden trek slash pro bike check rockshox zeb 2022 blackbox prototype
Appropriate to the conditions, Hattie opted for an RRP Pro Guard fender up front

Up front, the RockShox ZEB fork was BLACKBOX-marked, indicating a prototype. No, it’s not the recently released Flight Attendant electronic suspension fork in disguise, but it does run the same updated chassis with pressure release valves on the lower legs.

prototype rockshox zeb 2022 lower leg pressure release valves

RockShox are yet to release the complete details on the 2022 range of forks that are to come, but Hattie’s Trek Slash indicates they could be home to a new damper cartridge, as indicated by the new compression adjustment dial seen here. It looks like it will offer external adjustments for both low and high speed compression. RockShox has declined to provide a comment on this.

prototype rokshox zeb damper cartridge 2022 chassis hattie harnden bike check ews tweed valley

Hattie runs 73 PSI in the ZEB with no volume reducing tokens. High speed compression is set to fully open with LSC set to 8 clicks from fully closed. The rebound adjustment is set to 14 clicks out from the slowest.

Tire choice was very important for this race where trail conditions were very muddy and off-camber on some high-speed sections. Hattie opted for the Bontrager Team Issue SE5 (enduro casing) on the rear; the front tire hot-patch was sharpied-out. These were setup tubeless (pressures incoming) on Bontrager’s Line Elite 30 alloy wheelset.

hattie harnden pro bike check trek slash
SRAM’s 4-Piston Code RSC Calipers are paired with 220mm HS2 disc rotors with thermal dissipating paint, front, and rear

hattie harnden trek slash cockpit setup

In the cockpit, Hattie runs a Bontrager alloy riser bar cut down to 760mm, fitted with ODI Grips; for more comfort, she cuts the outboard edge off the top of the grips to make the surface flat all the way to the end. To keep check on timings and her power output, Hattie mounts her Garmin on the top tube via the Bontrager Pro Blendr Knock Block Computer Mount.

Tucked away inside the steerer tube is a Bontrager BITS Integrated MTB multitool, home to 2, 2.5, 3, 4, 5, 6, and 8mm hex keys along with a T25 and flat-head screwdriver. Hattie is able to carry more tools and spares in the internal frame storage cavity underneath the water bottle cage.

vhs chain slap noise damper
To keep everything running quiet, Hattie’s Trek Slash sports a VHS chainstay protector


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