The job
A double-ended counterhold for matching slotted nuts, used with a separate bolt driver.
Park Tool · Chainring-nut counterhold
Park Tool CNW-2 Chainring Nut Wrench
A double-ended counterhold for matching slotted nuts, used with a separate bolt driver.
$9.99Nov 7, 26, 12:53 AM · New York
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- Function Slotted chainring-nut counterhold
- Format Double-ended
- Outer width 12 mm nominal at both ends
Function
Slotted chainring-nut counterhold
Inspect the back of the bolt set
This tool needs an accessible matching slotted nut. Confirm the actual nut arrangement before adding it to the kit.
What this choice changes
Hold a slotted chainring nut while its bolt turns
The CNW-2 is useful when the slotted nut on one side of a chainring bolt turns with the bolt instead of staying still. It holds the nut while you operate the appropriate driver on the opposite side. This makes it a complementary tool to the bolt driver, rather than another way to engage a direct-mount chainring lockring.
Its two ends offer different tip widths for fitting the nut slots. Both have a nominal 12 mm outer width; the individual tips are 2.7 mm at one end and 3.8 mm at the other, with a nominal 1.35 mm blade thickness. Those contact dimensions help you compare the slot and access instead of assuming that every chainring bolt system accepts the same counterhold.
Choose it for the matching slotted-nut arrangement described by Park Tool. The supplied item is one wrench; chainring bolts, nuts and their driving tool are separate. Use the component’s tightening instructions, since this small counterhold does not measure the applied torque.
Specifications & supplied details
| Detail | Specification |
|---|---|
| Function | Slotted chainring-nut counterhold |
| Format | Double-ended |
| Outer width | 12 mm nominal at both ends |
| Individual tip widths | 2.7 mm at one end; 3.8 mm at the other |
| Blade thickness | 1.35 mm nominal |
| Supplied | One CNW-2; bolt driver and fasteners separate |
Choose for your actual setup
Inspect the back of the bolt set
This tool needs an accessible matching slotted nut. Confirm the actual nut arrangement before adding it to the kit.
Allow for the opposite-side driver
The counterhold prevents the nut turning; a separate correct driver turns and tightens the bolt.
Fit checks & limits
- Not a torque wrench or direct-mount chainring-lockring tool.
- Slot width, nut geometry and access must match; no universal chainring-bolt coverage.
Questions before you choose
Why does a hex key alone sometimes not finish the job?
On a matching slotted-nut assembly, the nut can turn with the bolt. The CNW-2 provides a counterhold while the separate bolt driver turns.
Are the 2.7 mm and 3.8 mm dimensions bolt sizes?
They are widths of the individual engagement tips at the tool’s ends, not the bolt diameter or hex-key size.
Does it replace the LRT-4?
They serve different fasteners. The CNW-2 holds slotted chainring nuts; LRT-4 engages a specific direct-mount chainring lockring.
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: B000OYFF2K.