Double Sided Spoke Wrench 3.3mm x 3.45mm

The 1633/2P is the two-in-one spoke wrench for the two nipple sizes you'll see most often in road and gravel wheelsets: 3.3 mm and 3.45 mm. Similar in form to a traditional combination wrench, this configuration lets one tool cover both common sizes without the bench shuffle of switching wrenches mid-build.

For most road wheelsets manufactured in the past decade, the nipples are either 3.3 mm (lighter, lower-spec rim builds) or 3.45 mm (the standard for high-end Mavic, DT Swiss, and similar premium builds). A wheelbuilder rarely commits to one size only; the 1633/2P keeps both sizes within reach without dedicated tool slots. Each side has a four-flat engagement, plastic-dipped grip on the handle, and the same tight nipple-fit tolerance as the single-size Pro wrenches.

The double-sided form factor is the right answer when bench space matters or when one wheel in front of you has 3.3 mm spokes and the next one has 3.45 mm. We carry three configurations of double-sided wrench (3.3/3.45, 4.0/4.4, and 4.3/4.4) to cover the road-and-gravel range and the MTB / heavier-rim range from two tools.

Compatibility

• Nipple sizes: 3.3 mm (one side), 3.45 mm (other side).
• Engagement: four-flat on both sides, to fit standard 3.3 mm and 3.45 mm internal spoke nipples.
• Wheels: most road, gravel, and lighter-spec MTB builds.

Specs

• Two nipple sizes on a single combination-wrench-style body.
• Plastic-dipped handle for grip.
• Companion sizes available in the 4.0/4.4 mm and 4.3/4.4 mm variants.

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 1633/2P double-sided wrench is a workshop-economy tool: one piece, two sizes, fewer dedicated wrench slots in the parts drawer. Smart compact tools are part of why the Unior wheelbuilding line shows up in event-mechanic kits and home workshops alike.

Pro tip from our mechanics

The two-in-one wrench has a small downside: you have to keep track of which side is which. We mark our 1633/2P with a band of colored tape on the 3.3 mm end and leave the 3.45 mm end bare; in the heat of a build, the visual cue lets you grab the right size without checking the stamping. The wheel-truing workflow is in How to true a bike wheel →