For year - Google "Giant serial number" or perhaps check the Giant website. I find the Bicycle Blue Book site to be next to useless.
Nobody can tell you the value of your bike without knowing mechanical and appearance condition, and even then it depends on the market you are in, time of year, and how fast you wish to sell it. For more info see my tip:
How to determine the year value etc of your bicycle
I’m happy to help further over the phone at https://www.6ya.com/expert/donald_f2ed37026a3ac881
SOURCE: Chain slips when in 7th
Hi.
If the chain slips when the bicycle is in high gear you need to align the rear derailleur hanger. See the picture below:
See this tutorial links:
rear derailleur video
derailleur-hanger-alignment
How to Check a Bike
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