Maybe it depends on the kind? We have the Britax marathon and they say to tether when rear-facing too.
ETA: just did a quick google search, and it looks like it does depend on model. Britax Marathon is one of the few convertible seats that are tested with the tether in rear facing.
Re: Another Convertible Seat Poll
This.
I swear I had never seen a car seat with one before.
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I thought the tether was only for forward facing?
our seats came with tether straps but the manual says to use when the seat is forward facing
LCT - 5.15.14 ~ 9lbs, 22.5 inches
Maybe it depends on the kind? We have the Britax marathon and they say to tether when rear-facing too.
ETA: just did a quick google search, and it looks like it does depend on model. Britax Marathon is one of the few convertible seats that are tested with the tether in rear facing.
This