Gen 1 Supercaliber/eCaliber Fox IsoStrut, Small Frame, 235mm x 32.5mm,Remote PTL

Detailed Specifications:

• Brand: Fox Racing Shox

• Model: FLOAT IsoStrut Factory Series A Remote PTL (Push-to-Lock)

• Series: 2021 Factory Series — Genuine Kashima Coat

• Part Number: 972-61-257

• Example Serial Number: 1012985-0030-T (Example Only – may differ per unit)

• Frame Compatibility: Trek Supercaliber / eCaliber Gen 1 (Small frame only)

• Shock Length: 235 mm (strut length)

• Damper Length: 135 mm

• Stroke / Travel: 32.5 mm

• Outer Diameter: 36 mm

• Rotation / Eyelet Angle: 60° (specific to Small frame geometry)

• Spacer Configuration: 0.1 Spacer

• Damper Type: FLOAT IsoStrut with Charger Race Day Remote PTL Damper

• Adjustments: External rebound, 2-position remote compression (Open / Lock)

• Air Spring: FLOAT Air Spring

• Axle / Mount Type: Proprietary Trek IsoStrut integrated design

• Material: Forged aluminum body with Kashima-coated aluminum stanchion

• Color: Gloss black body / Gold anodized stanchion

• Intended Use: Cross-Country / Marathon / Light Trail

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Additional Features:

• Factory Series performance: Fox’s premium-level damper with genuine Kashima Coat for reduced friction and superior wear resistance.

• FLOAT air spring provides tunable support and sensitivity for lightweight XC control.

• Remote PTL (Push-to-Lock) system delivers instant lockout and firm platform for sprinting and climbing.

• Integrated IsoStrut design maximizes frame stiffness and improves rear-end tracking precision.

• Race Day Damper tuned specifically for Trek’s Supercaliber/eCaliber Gen 1 suspension kinematics.

• 36 mm outer body diameter provides structural rigidity while maintaining low weight.

• Factory-built and serviceable by Fox or Trek service centers worldwide.

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Important Usage Notes:

• Fits Trek Supercaliber and eCaliber Gen 1 (Small) frames only.

• 60° rotation/eyelet orientation is specific to Small frame geometry and not compatible with Medium or Large.

• Not compatible with Gen 2 Supercaliber or other eye-to-eye rear shocks.

• Requires Fox remote lockout lever and cable (sold separately).

• Installation should be performed by a Trek or Fox-certified technician to ensure proper alignment and function.

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Riding Impressions:

The Fox FLOAT IsoStrut Factory Series defines top-tier XC performance with unmatched smoothness and pedaling efficiency. The Kashima-coated stanchion minimizes friction, giving riders a supple yet precise feel throughout the stroke. With the remote PTL lockout, riders can switch instantly between plush control and sprint-ready stiffness. It’s the choice for racers and performance-focused riders seeking the best from their Supercaliber or eCaliber Gen 1 platform.

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Disclosure:

This listing includes one genuine Fox FLOAT IsoStrut Factory Series A Remote PTL Rear Shock (235 mm).
Example serial number provided for reference — actual unit number may differ.
Non-retail packaged – includes only what is shown in photos.
Designed for Trek Supercaliber/eCaliber Gen 1 Small frames only.
Remote lockout lever, mounting hardware, and bolts not included.
Professional installation recommended.