In a 20" --- GB PowerTech or in O-brand ProLite --
(1) do you have the skill to replace a nose when you break it off? If your answer is wha?? or better h3!! no, the idea of a replacable nose is just BS. If you don't intend to go slop-lunging your bar into plunge cuts on 30" plus trees and snagging your nose in a kerf pinch from an opposing cut, at today's $$ the replacable tip on a 20" bar has no advantage. Everything else you can to do to destroy a smooth tip, can also be done to destroy a replaceable tip.
(2a) in 050 gauge, PowerTech and ProLite bars run smoother than replacable tips IMHO. The replacable noses are all 063 gauge (running 068) and when the chain is running 050, the 050 driver links have to sling around the 068 sprocket pretty much unguided and with decreased lateral support, and then suddenly re-align themselves upright at the mass produced joint on the underside of the bar. Look at that joint carefully ... the two grooves never line up exactly, unless you spend extra money on getting the joint "faired" in. Look at the leading edge of the drivers on a 050 replacable sprocket nose after a full day's use and you'll see the leading edges and tips are wearing down. Look at the same on a "full groove" bar, such as PowerTech. Why the difference?
(3) in a 20" bar, the "full guidance" bars, such as GB PowerTech (solid stock) are just as strong, but hte chain is held in close guidance with good lateral support for the drivers all the way around the bar. Reportedly, the laminated bars like ProLite can bend and pop rivits I am told--but never happend that I saw. IMHO, the continuous groove makes for a longer lasting chain and longer lasting bar. If you munge the sprocket or nose on either bar, you're just going to replace the whole bar anyway! Fact is, if they made full groove support bars at 24", I'd be using them instead of replaceable tips.
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re the alleged 2 /10,000 th part titanium in the GB titanium bars -- I've never used one, but on principle, I will say that depending on the metalurgical design of the steel, that is not necessarily an insignificant amount. So your competitive spew is just FUD. Those kinds of percentages might easily be enough to significantly improve the metalurgy of the entire bar, or of specifically treated areas. For example, the metalurgical treatment of a nikasil cylinder *wall *only might be about the same percentage (not including cooling fins etc. of cylinder body.)