The job
A spoke-length ruler plus bearing/cotter sizing holes; it does not measure spoke tension or nipple flats.
Park Tool · Spoke and small-component gauge
Park Tool SBC-1 Spoke, Bearing and Cotter Gauge
A spoke-length ruler plus bearing/cotter sizing holes; it does not measure spoke tension or nipple flats.
$12.95Nov 7, 26, 12:58 AM · New York
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- Spoke length scale 0–310 mm /0–12.25 in
- Spoke-head location Oblong opening for stated J-bend/straight-pull use
- Bearing holes 1/4, 7/32, 3/16, 5/32, 1/8 in
Spoke length scale
0–310 mm /0–12.25 in
Identify which dimension is needed
Spoke length, spoke section and nipple flats are different dimensions. This gauge does not replace every sizing tool.
What this choice changes
Size the part before choosing the next tool
The SBC-1 is useful at the identification stage of a repair or wheel build. The oblong end opening locates the head of a J-bend or straight-pull spoke for reading its length against the ruler. This helps compare an actual spoke with a replacement specification without confusing length with spoke gauge or nipple-wrench size.
Its scales span 0–310 mm and 0–12.25inches. Separate holes identify the listed ball-bearing and crank-cotter sizes. These are physical sizing contacts on the same gauge, not tension-conversion apertures or a claim that every bicycle bearing is covered.
The anodized-aluminum ruler has embossed markings. Choose it for the listed length and size checks; a caliper, spoke-wrench sizing check and tension meter address different requirements. No spokes, loose bearings or cotter pins are supplied with the gauge.
Specifications & supplied details
| Detail | Specification |
|---|---|
| Spoke length scale | 0–310 mm /0–12.25 in |
| Spoke-head location | Oblong opening for stated J-bend/straight-pull use |
| Bearing holes | 1/4, 7/32, 3/16, 5/32, 1/8 in |
| Cotter holes | 8, 8.5, 9, 9.5 mm |
| Construction | Anodized aluminum; embossed marks |
| Supplied | One ruler/gauge |
Choose for your actual setup
Identify which dimension is needed
Spoke length, spoke section and nipple flats are different dimensions. This gauge does not replace every sizing tool.
Check the listed hole sizes
Use the actual bearing/cotter size list rather than a general all-bicycle-parts claim.
Fit checks & limits
- No calibrated accuracy or every-spoke-head fit is established.
- Spoke gauge must not be used as a substitute for measuring nipple flats.
Questions before you choose
Which measurement do I need to choose a spoke wrench?
Check the actual nipple flats or other drive profile separately. The SBC-1’s spoke-length reading does not identify that receiving interface.
Does it measure tension?
No. It sizes parts. A tension meter performs a different measurement.
Will it identify every bicycle bearing?
The gauge has the listed ball-bearing holes; no coverage of every bearing type or size is established.
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: B000OZBK82.