Spring rate is spring rate. Does't matter if the spring is made of steel, or plastic, or banana, or even titanium. If you use a 450 lb spring, you use a 450 lb spring period.
The weight of titanium is about 60% of the weigh fo steel depending on the alloy. Titainum is more 'elastic' than steel so in some applications, less material can be used when a spring is made of steel
General rule of thumb: ti spring will weigh about half of your steel spring.
I think half is about the best you can hope for, usually it will be somewhere between 1/3 and 1/2.
On the Ti spring note, another thing (that I was just told about recently) is that RCS branded Ti springs are significantly heavier than the progressive and manitou ones. RCS do make those two as well, however those two must be shorter and have significantly less winds than the RCS branded ones.
The difference was apparently 100-150g on a 300x3.0 spring, so I think it's definitely something to think about - when you're spending that much money! I'd feel ripped!
I didn't read all of what the previous posts said...
However from what I learned from the school of hard knocks as well as Engineering School is this:
since Ti is lighter and more elastic it reacts a lot quicker in suspension than steel...
and that helps the moments of intertia transfer the forces of impact through the suspension quicker and w/less sluggishness... and hence makes for a more "active" feeling suspension...
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