Detailed Specifications:
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Brand: Fox Racing Shox
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Model: FLOAT IsoStrut Factory Series A Remote PTL (Push-to-Lock)
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Series: 2021 Factory Series — Genuine Kashima Coat
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Part Number: 972-61-257
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Example Serial Number: 1012985-0030-T (Example Only – may differ per unit)
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Frame Compatibility: Trek Supercaliber / eCaliber Gen 1 (Small frame only)
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Shock Length: 235 mm (strut length)
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Damper Length: 135 mm
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Stroke / Travel: 32.5 mm
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Outer Diameter: 36 mm
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Rotation / Eyelet Angle: 60° (specific to Small frame geometry)
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Spacer Configuration: 0.1 Spacer
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Damper Type: FLOAT IsoStrut with Charger Race Day Remote PTL Damper
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Adjustments: External rebound, 2-position remote compression (Open / Lock)
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Air Spring: FLOAT Air Spring
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Axle / Mount Type: Proprietary Trek IsoStrut integrated design
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Material: Forged aluminum body with Kashima-coated aluminum stanchion
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Color: Gloss black body / Gold anodized stanchion
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Intended Use: Cross-Country / Marathon / Light Trail
Additional Features:
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Factory Series performance: Fox’s premium-level damper with genuine Kashima Coat for reduced friction and superior wear resistance.
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FLOAT air spring provides tunable support and sensitivity for lightweight XC control.
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Remote PTL (Push-to-Lock) system delivers instant lockout and firm platform for sprinting and climbing.
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Integrated IsoStrut design maximizes frame stiffness and improves rear-end tracking precision.
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Race Day Damper tuned specifically for Trek’s Supercaliber/eCaliber Gen 1 suspension kinematics.
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36 mm outer body diameter provides structural rigidity while maintaining low weight.
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Factory-built and serviceable by Fox or Trek service centers worldwide.
Important Usage Notes:
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Fits Trek Supercaliber and eCaliber Gen 1 (Small) frames only.
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60° rotation/eyelet orientation is specific to Small frame geometry and not compatible with Medium or Large.
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Not compatible with Gen 2 Supercaliber or other eye-to-eye rear shocks.
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Requires Fox remote lockout lever and cable (sold separately).
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Installation should be performed by a Trek or Fox-certified technician to ensure proper alignment and function.
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.
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.
