Replacement Clamp Jaw Covers 57.2mm for Master Shop Clamp

Replaceable rubber jaw covers are the wear part on every Unior stand clamp; the rubber takes the daily grip-and-release work, picks up grit and frame cleaner residue, and eventually wears thin or tears at a corner. The 57.2 mm Replacement Clamp Jaw Covers are the cover size sized for the Master Shop Clamp 1693.1M with the shorter round-jaw geometry; the e-bike-era clamp head Unior redesigned in 2021 around heavy-bike workshop reality.

When the rubber wears, you replace the rubber; the clamp itself stays. The covers slip onto the existing round jaws without tools and lock into the retention geometry the Master Shop Clamp uses.

Why this size fits the Master Shop Clamp

Bikerumor's 2021 coverage of the Master Shop Clamp launch framed the design move directly: “Unior has updated their premium repair clamp with a more rugged, more rigid design to work with modern bikes and heavy e-bikes. The narrow 5 cm round jaws with replaceable rubber covers should fit just about any bike, while clamping it securely.” The 57.2 mm cover sits on those 5 cm round jaws; the older square-jaw clamps in the 1693.1 / 1693.1S family use the 96 mm cover, and the Pro Shop QR (1693.1Q) uses the 70 mm cover.

Why fresh covers matter

A worn jaw cover doesn't grip the frame tube the way a fresh one does. On heavy e-bikes (the use case the Master Shop Clamp was redesigned for), this matters more: clamping pressure is higher, and a glazed or torn cover fails earlier under that load. For carbon frames, the failure mode is a cored seat tube; for aluminum, a clamp-shaped dent.

Sizing: confirm before you order

This is the 57.2 mm cover for the Master Shop Clamp 1693.1M. Two other cover sizes exist for different Unior clamp variants:

• 70 mm covers fit the Pro Shop Clamp (1693.1Q) and the 70 mm-jaw variants of the 1693.1 / 1693.1S cam-style clamps.
• 96 mm covers fit the older square-style cam-clamp jaws on the 1693.1 / 1693.1S with the 90 mm jaw height.

The 57.2 mm cover is the right buy if your clamp is the Master Shop Clamp (round jaws, ~5 cm tall, fitted to the 1693EL Electric Repair Stand and sold standalone as the 1693.1M).

Specs

• Article number: 1693.11 (57.2 mm variant for Master Shop Clamp)
• Material: rubber
• Compatibility: Unior Master Shop Clamp 1693.1M (also fitted to 1693EL Electric Repair Stand)
• Sold as: a pair (one set covers one clamp head)

Includes: pair of 57.2 mm replacement rubber jaw covers.

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 Master Shop Clamp's round jaws and replaceable covers were part of the 2021 redesign that took the clamp from “shop floor general purpose” to “e-bike-era workshop standard”; the 57.2 mm cover is the sizing match for that design.

Pro tip from our mechanics

The Master Shop Clamp's covers see more load per clamping cycle than the older square-jaw covers because e-bikes are heavier and demand more pressure to hold. The service interval is faster on a Master Shop-equipped stand running heavy bikes than on a 1693.1S running road bikes; shops typically replace these every twelve to eighteen months in heavy e-bike service, versus every three to five years for a road-bike-only cam clamp. Shopping for the clamp head itself or the stand that carries it? The buying guide makes the e-bike-stand decision concrete: How to choose a bike repair stand →