As line thickness increase your use rate on a given circuit goes down, at the same time the amount of line you can carry on a spool before a reload is also reduced.
I use 0.155" not for it lasting longer, but to have more "punch" to take out the larger/tougher stuff easier. I'm not using it on grass. I can take out very small trees with the big stuff.
It only has the punch if your machine can swing it, and you likely need a new head (minimal expense)
My 555RXT has no issues. It comes with both the T55X M12 string trimmer head as well as the Multi 350-3 grass blade. I bought a different bevel gear so I could run a forestry saw blade on it as well.
I have a Stihl store in walking distance of my house, if it were a Husky shop - thats what I'd have.
Interesting on the gearing change.They don't offer it in the states. I had to order it from the UK. They have the 555FX here in the states, but it has the shorter shaft with the saw blade bevel gear. I wanted the longer shaft of the 555RXT (I'm 6'5" tall), which came with the string trimmer head + grass blade. I then found and bought a new 555FX bevel gear and blade to use with the one I bought, so I have three options with it. Problem is, seeing they don't offer the 555RXT here, I can't buy the same size replacement grass blade for it. The 350-3 grass blade is larger than I can find anywhere in the states. All I can find is the smaller 300-3 blade.
Interesting on the gearing change.
Never done that before, just put a blade on and ran it.
The bevel heads are geared differently between what comes with the string head/grass blade vs the saw blade. I was worried about destroying the bevel head by simply throwing a saw blade on it, as I ran across a guy who did just that. I then happened to find a brand new 555FX bevel head for sale on eBay, so I grabbed it. Came with the guard and everything needed. The guards are also obviously different.
View attachment 108060
Whats the reason behind the change?
Bothering to name it a bevel head insinuates the existing head is likely a straight cut gearbox.
The bevel will be quieter and likely less vibration, but a bit less efficient.
I read up on a lot of this "SwampDonkey" guy here on the Forestry forum before I bought mine. He does it for a living. These are two of the posts I could find. Nothing related to what we were discussing though. He talks about the blades and what to buy as well as the Husky harness vs Stihl.
Clearing Saw - Stihl 560 - Husqvarna 555 - Echo 410U ????
Clearing Saw - Stihl 560 - Husqvarna 555 - Echo 410U ????forestryforum.com
Interesting that 555 makes 3.4Nm of torque and my 36V Makita makes 5.4