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 sponsors professional road and mountain-bike race 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? →.