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Almost all bearings are measured in metric and coded. The code is laser or acid etched into the race. Understanding the code helps make bearing selection easy.
Example:http://www.bearing-king.co.uk/images...re-bearing.jpg
The bearing type design that you need is a single row deep groove ball bearing with the following dimensions and suffix.
d = 25mm
D = 52mm
B/T = 15mm
Result = 6205
The bearing also has a seal either side of the bearing.
2RS1 = 2 Rubber seals
2RSR = 2 Rubber seals
DDU = 2 Rubber seals
2Z = 2 Metal shields
ZZ = 2 Metal Shields
Result = 6205 2RS1
This link gives more detailed information. http://www.gizmology.net/bearings.htm
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Make sure u don' t overtighten the spanner nut just get it past the hole enough to get the cotter pin back in. Too tight will smoke your new bearings
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Mike can you change out the whole hub. I did that to mine got them from Northern tools. Napa has the bearings to fit them.
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I bought a complete hub-in-a-box kit from Bass Pro, everthing you need to fix it up on the roadside ( except spindle...lol ) i haul it every where i go, just in case. I like that it comes in a neat little plastic carry box.