Detailed Specifications:
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Brand: Fox
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Model: IsoStrut Rear Shock – Factory Series (Kashima)
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Part Number: 972-61-239
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Tune ID: DQ6B
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Model Year: 2020 Series
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Bike Compatibility: Trek Supercaliber & E-Caliber Gen 1 only (Size M–XL frames)
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Travel: 32.5mm
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Damper Length: 135mm
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Strut Length: 235mm
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Outer Diameter: 36mm
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Rotation / Eyelet Angle: 30° (specific to M–XL Supercaliber frames)
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Spacer: 0.1mm
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Actuation Type: Remote PTL (Push-to-Lock)
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Adjustment Type: Remote-operated compression with rebound adjust
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Finish: Black body with Kashima-coated stanchion
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Intended Use: Cross-country (XC) / Marathon
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E-Bike Compatibility: Yes (E-Caliber only)
Factory Series Details:
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Factory-level performance featuring a Kashima-coated stanchion for the smoothest operation and long-term durability.
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Built around Trek’s proprietary IsoStrut suspension system, combining the efficiency of a hardtail with the control of full suspension.
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Optimized for 235mm x 32.5mm travel on Gen 1 Supercaliber & E-Caliber frames (M–XL).
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Lightweight aluminum construction with high-flow damping for consistent performance in racing conditions.
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Remote lockout compatible, allowing on-the-fly control between open and firm suspension modes.
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Tuned by Fox specifically for Trek’s IsoStrut geometry to maintain pedaling efficiency and rear-wheel traction.
Important Usage Notes:
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Designed exclusively for Trek Supercaliber & E-Caliber Gen 1 frames (sizes M–XL).
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Not compatible Gen 2 Supercaliber models.
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Must be installed and serviced by a qualified Trek or Fox service technician to maintain warranty and performance.
Riding Impressions:
The Fox Factory Series IsoStrut (DQ6B) defines efficiency and race-level performance. The Kashima-coated stanchion reduces friction, delivering a plush yet efficient feel, while the remote-actuated design ensures immediate suspension control on race courses. It’s a lightweight, high-performance rear shock built specifically for riders chasing speed and precision on the Supercaliber platform.
Disclosure:
This listing is for a genuine Fox Factory Series IsoStrut Rear Shock (235x32.5mm, Tune ID DQ6B), designed for Trek Supercaliber & E-Caliber Gen 1 (M–XL) frames.
Retail packaged and covered under Fox’s full manufacturer warranty when installed by an authorized Trek or Fox service center.
