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Tom - Just got confirmation on some things, as follows;

Bend radius we are keeping the same as the non Extreme, MIN of 8".

it is only compatible in the sense that the foot prints and such are the same. The Extreme cable only works with the Extreme helm (you won't get an non-Extreme cable to fit in the Extreme helm, and vise versa). in other words, if replacing and older system you will want to purchase the entire kit.

this is 5-turns lock to lock

the price sounds about right to me, and I agree, for the 15' it is an absolute perfect fit... I see a lot of these Extreme systems being sold in the near future to be hones...