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Varsity Squad
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751 Posts
You really only need to replace the hub assemblys one at a time, and kevin is right that you can't just replace the bearing as they are part of the sealed hub assembly. People recommend doing them in pairs because they are wear items and if one went then the other probably isn't far behind, but if you hit a ditch on that side then that can cause problems for the bearing also. The reason your gas milage went down is because you went with shorter tires so your wheels are spinning faster to get where you are going.
 
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