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Light bindings that are made well are 5lbs/pair give or take. Tyrolia Peak 15s/09 Head Mojo 15s/4FRNT deadbolt 15s are 5.1lbs and durable, STH 16s are made much better than 12s and 14s and are 5.2lbs. There is a reason the bindings you named are so light. Just take the extra half pound for a much better binding. The older Solly 914s are about 5lbs/pair.
the z12 TIs break all the time, even with skiers who do not ski hard. If they do not break they just pre-release. Griffons have been talked about alot in the past few days, so search. STH 12s and 14s are also made somewhat similar to z12s, so just get STH 16s or S912/S914s if you want a solly.
Haha I will just throw some on 202 Lotus 138s or 198 XW Labs for my park skis then.
And yes, STH 12 and 14 will pre release all the time along with the whole Z series Solly bindings. S914/914/916/STH 16 are all good though and will work well for park and everywhere. They are all decently light for what they are though. (except 916, like 6.5lbs haha). And Tyrolias are great. Just about any high end Tyrolia(Peak/Mojo, FF, railflex) is a good binding. I can't comment on the superlight Tyrolias though, but think about it, there is a reason good bindings don't tend to be much under 5lbs.