Mavic Spoke Wrenches 6.4mm Nipple & UST Rim Insert

Mavic doesn't use standard spoke-nipple geometry. The brand's premium wheelsets; Ksyrium, Cosmic, and the rest of the high-end Mavic line; use a proprietary 6.4 mm outer-diameter nipple that won't fit a 5.5 mm or smaller spoke wrench. The 1635 is the Mavic-specific wrench, double-sided to cover the 6.4 mm nipple on one end and the Mavic UST tubeless rim insert on the other.

For a workshop servicing Mavic wheels, this is one of the irreplaceable tools. The 6.4 mm engagement is tight to the published Mavic tolerance, which means it doesn't round the nipple on the first hard turn the way an under-sized wrench would. The UST rim insert side handles the tubeless valve seating and removal on Mavic's UST-spec rims; this is the tool a road-or-MTB tubeless setup needs.

If you have R-sys wheels (the proprietary Mavic system with bonded carbon tubular spokes), you need the companion tool: the Mavic R-sys Spoke Wrench 1636, which carries a different fitment than the 1635.

Compatibility

• Nipples: Mavic 6.4 mm outer diameter (standard on Mavic premium wheels).
• Rim inserts: Mavic UST tubeless rim insert (one side of the same tool).
• Brand-specific: this is a Mavic-fit tool; standard 3.3/3.45 mm wrenches do not engage Mavic nipples.

Specs

• Two fitments on a single tool: 6.4 mm Mavic nipple end and UST rim insert end.
• Mavic-specific dimensional accuracy.

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. Mavic is a French wheel-component brand and a long-standing partner in the cycling-tools world. The 1635 is one of two Mavic-specific spoke tools in our catalog (the 1636 covers Mavic R-sys); the engineering choice to commission Unior-made Mavic-fitment tools reflects Mavic's distinct nipple geometry; a generic wrench would round the nipples and damage customer wheels, so workshops servicing Mavic stock the Mavic-specific gear.

Pro tip from our mechanics

Identify the wheel as Mavic first, then reach for the 1635. We've seen new mechanics try to use a standard 5.5 mm wrench on a Mavic 6.4 mm nipple and round the nipple before they realized the size mismatch; the resulting repair is expensive and avoidable. If the wheel has the Mavic logo on the rim or hub, the 1635 is the right starting tool. The full wheel-truing workflow is in How to true a bike wheel →