The job
A Y-tool with long low-profile shafts for 3.2 mm square,5 mm hex and 5.5 mm hex contacts.
Park Tool · Spoke-nipple wrench
Park Tool SW-15 Internal Nipple Wrench
A Y-tool with long low-profile shafts for 3.2 mm square,5 mm hex and 5.5 mm hex contacts.
$18.95Nov 7, 26, 12:58 AM · New York
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- Working drives 3.2 mm square;5 mm hex;5.5 mm hex
- Shaft length 50 mm
- Square-end shaft OD 6 mm
Working drives
3.2 mm square;5 mm hex;5.5 mm hex
Check drive shape and surrounding access
The working profile must fit the nipple, and the outer shaft must pass the rim opening.
What this choice changes
Three internal drive profiles with separate access checks
The SW-15 addresses spoke nipples driven from inside the rim. Its three working profiles—3.2 mm square,5 mm hex and 5.5 mm hex—are different from an open wrench engaging external nipple flats. Choose it after identifying both the internal drive shape and the available access through the rim.
Each shaft is 50 mm long, but shaft length is only one access check. Park Tool also gives outside shaft diameters of 6 mm for the square end,7.5 mm for the 5 mm hex end and 8 mm for the 5.5 mm hex end. An opening large enough for the drive size may still be too small for the shaft around it.
The three ends share one Y-shaped handle. It is useful when the toolkit needs these internal contacts, rather than as a general replacement for every spoke wrench or an initial-loading driver. No spoke tension is measured by this tool, and a wheel-brand name alone does not establish that the required internal profile is present.
Specifications & supplied details
| Detail | Specification |
|---|---|
| Working drives | 3.2 mm square;5 mm hex;5.5 mm hex |
| Shaft length | 50 mm |
| Square-end shaft OD | 6 mm |
| 5 mm-hex shaft OD | 7.5 mm |
| 5.5 mm-hex shaft OD | 8 mm |
| Supplied | One Y-tool with three ends |
Choose for your actual setup
Check drive shape and surrounding access
The working profile must fit the nipple, and the outer shaft must pass the rim opening.
Separate internal and external contacts
A conventional open nipple wrench serves a different receiving surface.
Fit checks & limits
- No universal deep-rim cavity or wheel-brand compatibility.
- Shaft length does not by itself establish usable reach in every rim.
Questions before you choose
Why are both 5 mm and 7.5 mm listed?
The 5 mm value is the working hex drive;7.5 mm is that shaft’s outside diameter. Both may matter for access.
Does it measure or set tension?
It turns a matching nipple. A tension meter supplies a separate measurement.
Can I use an ordinary external spoke wrench instead?
Only if the nipple provides the required accessible external flats. SW-15 serves the stated internal profiles.
Guides for this choice
Selected listing details, manufacturer information and source images were compared. No hands-on trial or universal fit is claimed. Product identifier: B001B6LO16.