The Park Tool ISC-4 Internal Seat Tube Clamp, click to enlarge
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Item # ISC-4

(discontinued) / Tools / Frame & Fork

Internal Seat Tube Clamp

Clamping directly to freshly painted or ultra thin-walled frame tubing can cause inadvertent damage. The ISC-4 securely holds most bikes without clamping on any frame tube. To use, simply insert the ISC-4 into the frame’s seat tube, tighten the knob, and clamp into any Park Tool Repair Stand. The ISC-4’s hex-shaped shaft resists twisting while clamped in the stand. Works with a huge range of seat tube sizes—anything with an inside diameter of 24mm to 32mm.

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