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Vintage Shimano Hyperglide Bearings

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Vintage Shimano Hyperglide Bearings

Old 09-07-11, 10:52 PM
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OldRoadman
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Vintage Shimano Hyperglide Bearings

Hi... I'm re-furbing a 90's Shimano Hyperglide freewheel (14-28 Singapore) and need to determine the ball bearing sizes for replacement. Can't seem to find a post in search. This one has almost perfect gears and just about zero wobble. No black 28 gear. Almost looks like a new IRD. I know these are cheap but I like this one and I got plenty of time!

Thanks, Bill
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Old 09-07-11, 11:11 PM
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When I took one apart without trying I recall they were small like 5/32 and there were very many of them.

https://www.bikeforums.net/showthread...ewheel+rebuild

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Old 09-07-11, 11:40 PM
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I think there is an exact size designation and a bearing grade for these. Metric or American!
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Old 09-08-11, 04:29 AM
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In my experience the balls in Shimano, Suntour, and Regina freewheels are all the same size. Specifically, I have not measured them. But when I needed a spare ball or two I simply went to my Ball Bearing kit from Loose Screws and used the smallest balls, which happen to be 1/8s.

L-R: Suntour, Shimano, Shimano



Regina Corsa for comparrison


Loose Screws Ball Kit
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