Runwell GAUGE42S Track Chainline Gauge
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NJS CHAINRING GAUGE measures the "42mm±2mm standard" in NJS Keirin track bikes. As shown in the photo, place the V-groove of the gauge on the seat tube and check length (42 mm wide) from there to the center of the elongated hole on the right side.
– SUS304 stainless
– Edges are smoother than previous version
– Improved: When checking the bending of the chainring teeth, the old model hit the crank and could not confirm the bending of the teeth on the back of the crank, but by downsizing, it is now possible to turn the chainring. In addition, by widening the V-groove that touches the seat tube, it can also be used on frames with wide seat tubes.