GAUGE42Si Gold chainline tool by Runwell

***Now in beautiful titanium coated Gi gold finish!***

The NJS CHAINRING GAUGE measures the "42mm±2mm standard" chainline on NJS Keirin track bikes. You can also use it to check the chainrings, which may bend due to an impact after a fall.

• Total length 80x35mm
• Weight 28g
• Material stainless steel

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. If the installed chainring is positioned within the elongated hole, it meets the inspection requirements. Especially when using a tapered crank, the tapered part may rub too much and be pushed deeper than necessary.

-Notes-

*This product was made as a gauge to measure the chain line with a tapered crank. Please note that it may not be possible to measure correctly depending on the design width of the BB shell. Also, depending on the hub of an overseas manufacturer, the rear sprocket may protrude, and the appropriate chain line may not be obtained even if you check it with this product.

*Please refrain from installing Sugino cranks on HATTA bottom brackets. Due to the difference in taper angle, the cranks will not fit in properly and the chain line will not be properly aligned. Excessive tightening may damage the bolts.