Park SW-40 Four-Sided Spoke Wrench - 3.23 mm
The iconic Park Tool spoke wrench design with a unique four-sided wrench shape for a precise, secure fit. Sized for spoke nipples with 3.23 mm (0.127 in) wrench flats.
The SW-40 is one of the tools that actually lives on our bench in Georgia. Park Tool design and manufacture it in Minnesota; ProWheelBuilder is an independent wheel builder in Georgia and a Park stockist, not the manufacturer.
What it does
Nipples are soft and the flats are small. A wrench that is a size out will round one on the first hard turn, and then the spoke has to come out.
Which size is this one?
This one is 3.23mm. Park list several sizes because the parts really do differ; using the next size up is how flats get rounded. If you are guessing, measure across the flats first.
What Park say about it
- Unique four sided jaws provide extra support on nipple flats
- Helps prevent slipping and deformation of aluminum nipples
- SW-40 (black) .127" nipple / 3.23mm
- SW-42 (red) .136" nipple / 3.45mm
Specifications
| Model | SW-40 |
|---|---|
| Park name | Four-Sided Spoke Wrench - 3.23 mm |
| Type | Spoke wrench |
| Size | 3.23mm |
| Brand | Park Tool |
About this listing
Sold here as a single tool. Unlike the rims and hubs we list, nothing gets built around it — it ships as it comes.
How we use it at ProWheelBuilder
Everything Park we stock is something we use ourselves. We would rather carry a short list we trust than a long one we have never opened. Unsure whether the SW-40 fits your parts? Ask first. We will tell you if something else suits it better, even if it is cheaper.
Park's kit is the industry default largely because it is documented. Their repair guides reference these exact tools, and they keep making them.
Park Tool's videos
Warranty
Park's warranty. Most Park Tool products carry a limited lifetime warranty against defects in material and workmanship. Pumps, stools, torque wrenches, electronic tools, motors and power supplies are covered for one year. Normal wear, misuse and damage from improper use are excluded.
ProWheelBuilder. ProWheelBuilder's one-year wheel warranty covers the wheels we build and does not apply to tools and accessories, which carry their manufacturer's cover.
Full terms are on our Policies & Warranty page.
SW-40 questions
Do you ship tools on their own?
Tools ship alone, usually the same day the order lands.
Is this the right one for my wheels?
Tell us what you are working on and we will tell you straight. A spoke wrench has to fit the part exactly; the wrong size does damage rather than work.
Not sure? Text or leave a voicemail on 470-253-0929 or email info@prowheelbuilder.com — you will be talking to the people who build the wheels.
