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The beginning of the season is a good time to check our bikes carefully. The last thing we need the evening before a ride is to find out that our chainrings are too worn to work with a new chain, or that our bottom bracket is about to pack up. A poorly maintained bike might leave us stranded on the road, or worse, cause us to crash.
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And a lot more good advice (with pictures) -
http://janheine.wordpress.com/2013/04/09/spring-bicycle-inspection