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It's great to see you in the Community @Genten! Welcome. You can see the details of elevation in your Fitbit.com Dashboard online using a computer, click on Log > Activity > Bike > View Details. Your Setting should be on Centimeters, find the Settings in the upper right corner of your Dashboard. (Settings > Advance Settings). 
Please note that this information is tracked by using the option "Bike" in the shortcust of your Surge, since it requires GPS connection.
I hope this helps, I'll be around! 
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Community Moderator Alumni are previous members of the Moderation Team, which ensures conversations are friendly, factual, and on-topic. Moderators are here to answer questions, escalate bugs, and make sure your voice is heard by the larger Fitbit team. Learn more
Awesome to see you here again @Genten! Got it! You will find the option to delete you old Surge under Account > Tap on the tracker > Trash can. If you have a mobile device is almost the same Account > Tap on Surge > and delete the device.
You can also choose the option "Set up a device" from the Account section and during connecting your Account will recognize that you're replacing the Fitbit. For Setup instructions check this master post.
Have a good one! 
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