I am replacing chains on two 2021 Rad Rover 6+. Support said use 120 link chains. HOWEVER when I took old ones off there were 124 links with no master link or quick connect??? SO IS this an update from Rad to use 4 fewer links for some reason like shifting, derailleur tension, incorrect info, or is it common knowledge that all chains have 4 or more extra links above the stated amount that you are expected to remove to adjust?

The replacement chains that I ordered (that stated were 120 links on website) ended up having way too many links lol. Will have to remove 8 links to be at original old chain link count. This new KMC chain that came in box saying Himiway 7 speed Z8.3 EPT does provide a reusable quick link. YEAH!

Thanks for any input to MR CONFUSED 

Need to replace both of our radrover6+ chains. Rad is out of stock. All I can get from support is buy 120 links. Will not advise on best chain or why they say 120 links when all I can find for 7 speed ebike google search is 116 links. I also cannot find info about rust resist chains since we ride the beach a lot. Please give me your experience with different chains for this model bike. Also any info on best tools needed for removing links, master link etc