To know exactly which undersized bearings you need on the crankshaft, it is important that you measure it correctly. Measuring with a caliper is difficult, which is why this tool has been developed.
This metal disc has the exact size of the crankshaft to be measured, all that remains is to place the right side around the crankshaft running surfaces and see which one is suitable.
The disc has 4 sizes: standard 0.00mm, and the 3 most common undersized 0.25, 0.50 and 0.75mm
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