The job
The selected red SW-2 is one conventional nipple wrench; colour is an identifier, not the fit test.
Park Tool · Spoke-nipple wrench
Park Tool SW-2 Red Spoke Wrench
The selected red SW-2 is one conventional nipple wrench; colour is an identifier, not the fit test.
$9.95Nov 7, 26, 12:58 AM · New York
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- Nipple flats 3.45 mm /0.136 in
- Contact Conventional external-square wrench
- Construction Heat treated; nickel plated; vinyl dipped
Nipple flats
3.45 mm /0.136 in
Measure the flats
Use the actual nipple, not the spoke gauge or a bicycle category, to select the wrench.
What this choice changes
A 3.45 mm external-square contact
The selected offer is the red SW-2, sized for 3.45 mm (0.136inch) nipple flats. It is a conventional external-square spoke wrench, rather than a tool for internal sockets or a proprietary spline. Measure the actual flats before choosing it; the spoke diameter, bicycle price or wheel brand is not a reliable sizing rule.
Park Tool specifies heat-treated, nickel-plated construction with a vinyl-dipped grip. This is the manual turning tool. It does not measure tension, identify a target tension or hold the spoke against rotation by itself.
Compare the selected black SW-40 only after checking its different 3.23 mm size and four-sided contact. These two offers demonstrate a real construction choice, but are not interchangeable same-size alternatives. If the spoke needs restraint during adjustment, a suitable holder is a separate tool.
Specifications & supplied details
| Detail | Specification |
|---|---|
| Selected model | SW-2 / red |
| Nipple flats | 3.45 mm /0.136 in |
| Contact | Conventional external-square wrench |
| Construction | Heat treated; nickel plated; vinyl dipped |
| Supplied | One wrench |
Choose for your actual setup
Measure the flats
Use the actual nipple, not the spoke gauge or a bicycle category, to select the wrench.
Check the whole receiving profile
An external square wrench does not substitute for internal hex or proprietary splines.
Fit checks & limits
- The selected SW-40 has a different 3.23 mm fit; no direct substitution.
- No universal wheel target tension or tool-torque rating is established.
Questions before you choose
Is this the black SW-0?
No. The selected ASIN/variant is red SW-2 with 3.45 mm flats.
Can I choose it from spoke thickness?
No. It matches nipple flats, which are a separate dimension.
Does SW-40 fit the same nipple?
The selected SW-40 is 3.23 mm and uses four-sided contact. It is not a same-size replacement for this 3.45 mm tool.
Guides for this choice
Buying guide ↗
Match the Component Contact Before the Drive Handle
Separate the surface that touches the bicycle from the interface that accepts your wrench, then check access and any required retaining accessory.
Buying guide ↗Choose Wheel Tools for Runout, Dish and Spoke Tension
Decide which wheel measurement is missing, then match the support arrangement, spoke data and actual nipple profile.
Other equipment to consider
Selected listing details, manufacturer information and source images were compared. No hands-on trial or universal fit is claimed. Product identifier: B000C15EMG.