I haven't tried Lucas Xtra I noticed it was polyurea vs Red N' Tacky which is lithium complex.
I know both will probably work for bearing applications but I'm wondering what the differences are going with the different chemistries.
There are 2 applications I would like to use them on:
1. The Idler pulley on the car's belt (which is currently using Red N' Tacky) this is a highspeed high heat application as it's mounted on the engine and tends to run at high RPM. The Red N' Tacky seems to be working sufficiently however most of the grease seems to be flung out by the end of a 2 year interval.
2. Bicycle wheel hub bearings. These spin at a far slower RPM generally aren't subjected to high heat but might experience slight impact loads from the road surface. Also a requirement must withstand winter riding conditions so -15C (5F) -> 35C (95F) operating range is about normal right. Also might be some riding in the rain so slight water resistance would be a plus however riding while in the rain and slush is generally avoided so this might not be a big deal. Not a racer so a tiny bit of additional drag by grease won't really affect daily riding.
I'm mostly looking for durability in people's experiments how do the two do in terms of durability? Currently the bicycle also runs red N tacky on the wheel hubs only would it be worth it to overhaul and replace with polyurea based grease? In terms of technical specs from lucas they list the following relevant differences.
Red N Tacky: 10%
Xtra HD: 5%
Red N Tacky: 5%
Xtra HD: 10%
Those separation and washout numbers aren't very impressive, I'd look at other greases.
For your bike in the cold, I'd test the grease in a freezer first. I just tried a tube of Amalie grease that says -40 on the tube. Put a blob of it in the freezer [-10] overnight and it was like a solid piece of soft rubber, couldn't even stir it with a kinife. No way I'd want to ride a bike with that stuff in the bearings. I had three other greases with the Amalie and they all did much better even though they were not rated as low.