![]() ![]() The lower the number after G mark, the closer a ball is to a perfect sphere of a given dimension. The number represents how many 1/1000 inches is maximal deviation from nominal dimension. They are written in the format: G XXXX, where XXXX is a number ranging from 3 to 2000. Grades are noted in numbers, ranging from 3 to 2000. ![]() acceptable deviation) from a perfect sphere of a given diameter. Quality (manufacturing precision) grades of bearing balls Headset (fork bearings) standards explained: Bicycle headset bearings standards – SHIS.Ĭup and cone bicycle hub overhaul tools and procedure: Bicycle hub overhaul.ġ. Post explaining bicycle bearing types and construction: Types and designs of bicycle bearings. This post lists standard ball sizes and gives guides on how to choose a good quality ones, without the need to buy special, branded “bicycle bearing balls”. This is the case with most Shimano hubs (wheels) – they still use the cup and cone system. However, many bicycles still use older, cup and cone system, where balls can (and should) be replaced with new ones when servicing bearings. Modern cartridge bearings come as a closed unit – with balls and races packed in a single unit. ![]()
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