Pro Repair Clamp, Manually Adjustable

The manually-adjustable clamp head for the Unior 1693 Pro Repair Stand family. A hand-turned screw on the side of the clamp body sets the jaw opening to the frame tube's exact diameter, and the closing pressure is dialed in by the same screw; no wrench needed, no measure-the-tube step against a published spec. The deliberate, fits-anything clamp for the workshop where the frames coming in vary widely.

The wider jaw range (24-40 mm vs. the auto-adjustable 1693.1-US's 24-32 mm) is the load-bearing difference. A 40 mm clamping width covers the oversized top tubes on some BMX frames, the oversize aluminum frames on DH bikes, and the dropper-post hardware on MTBs in retracted position. The cases that fight the auto-adjustable's range are exactly the cases the manually-adjustable's range covers without fuss.

Where the screw matters

The screw is on the side of the clamp body, accessible without a wrench. Turn it counter-clockwise to open the jaw; turn clockwise to close. At the working position, the screw also sets the closing pressure: more screw turns past first contact = more clamping force on the frame tube. For a thin-walled or paint-sensitive frame, the mechanic sets a light closing pressure; for an aggressive DH frame that needs to hold against torque-wrench work on the cassette, the pressure goes up.

The manual adjustment is slower than the auto-adjustable per setup, but the trade-off pays off in two cases: frames at the upper end of the diameter range (above 32 mm) and frames where the mechanic wants to set a specific closing pressure for paint or carbon protection.

Compatibility

• Frame tube diameter: 24 mm to 40 mm
• Fits the Unior 1693 Pro Repair Stand family
• Replaceable rubber jaw covers (1693.11) for grip and frame protection

Specs

• Clamp type: manually adjustable via side-mounted screw
• Jaw width range: 24-40 mm
• Pressure adjustment: hand-turned screw (no wrench required)
• SKU: 1693.1S-US (629232)

Built in Zreče, Slovenia

Unior has been forging hand tools in Zreče since 1919, and is the official technical partner of multiple World Tour and downhill teams. The 1693 Pro Repair Stand series spans single-arm, double-arm, electric-assist, and stationary variants; the manually-adjustable clamp is the spec choice for shops working on frames outside the 32 mm auto-adjustable range, or workshops where the mechanic prefers the closing-pressure control on every clamp event.

Pro tip from our mechanics

For a carbon frame, the manually-adjustable clamp lets you set a lighter closing pressure than the auto-adjustable's spring delivers. The auto-adjustable is calibrated for steel and aluminum frame integrity; carbon has a lower compression threshold before paint cracks or layup damage appears. A carbon-specific workshop tends to run the manually-adjustable on at least one stand for the bikes where the mechanic wants closing-pressure control.

For the picture on tool-kit inventory and where a manually-adjustable clamp earns priority on a carbon-frame or oversized-tube workbench: What bike tools do I need? →.