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Can anyone tell me the differences between an Inferno ST, ST-R, and ST-RR? All are MP777’s? I could be mistaken. Thanks in advance. Here’s what I’m looking at:

Looks like an Inferno ST-R with an upgraded motor. Blue stamped plates are visible, and shocks with clip on collars instead of threaded like the RR. Chassis plate is hard anodized and not stamped blue ano like the base model.

ST-R, The chassis braces on top of what is stated above suggest that. The ST-RR is a longer wheelbase so definitely not that

Thanks for the responses. Are there any problematic areas to upgrade or replace? Diffs, arms, etc

Should be pretty solid, check the diff internals to ensure there are 4 spider gears in there. Some of the RTR models only had 2 (But this one should’ve been kit form originally).

Awesome thank you. And anyone know about the engine? It’s a Picco P3-28 with a pull start.