The Park Tool ISC-1 Internal Seat Tube Clamp, click to enlarge

Item # ISC-1

(discontinued) / Tools / Frame & Fork

Internal Seat Tube Clamp

The ISC-1 has been discontinued and replaced by the ISC-4.

Clamping directly onto frames made from carbon fiber and other ultra-thin materials can cause inadvertent frame damage. The ISC-1 is designed to allow you to hold frames securely without clamping onto a tube and to raise the bike to a more comfortable working height. To use, insert the ISC-1 into the seat tube, turn the knob to expand the tool, and then clamp into any Park Tool Repair Stand. Fits frames with seat tube diameters 25mm to 27.4mm.

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