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Just so you're not surprised when you begin working on your hubs, the 770 series only requires a 5mm allen key and a 17mm spanner for loosening the hub axles. Keep the 13 and 15 for when you're working on your friends' older gear.

The Shimano technical documents website is wonderful resource. If you have any series specific maintenance questions, it is the first place I look.

In this case this page had the information you needed:
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