[lincpimp]

More load is more load, no way around that.

If the batteries can handle the addl load and draw the 25t pinion requires all should be ok. No idea on motor temps though, with the stock flux tires (which are probably out of balance to begin with) and the tall gearing on 6s lipo it will place quite a load on the flux motor.

I have not seen much raw data on what batteries were used with the cooked escs that ran 6s with the 20t pinion. Cheap batteries that cannot perform will cause all kinds issues with these high power setups, we all know that by now...

The 20t pinion on 6s should yield speeds around 50 mph. I see no reason that would cause issues. I run MMM escs on 6s lipo geared for those speeds in heavy trucks and my escs do not fry... I also use top notch batteries and know what I am doing.

Yet again I have a feeling that people who are not very knowledgeable with brushless are having the majority of the problems. These are the same people who cannot tune nitro, and most likely pay the LHS staff to replace the broken parts on their trucks... Some failures of the escs are going to happen regardless of the use, that is just how it is with electronics.

And the gearing chart in the flux manual is just that a GEARING CHART. It shows what speeds you can get with the various pinions and battery combos. I read it a while back and did not take it as a recommendation or requirement (although its existence in the manual does indicate that the listed gearing can be used).