1515 or 1521?

[Sower]

Well, I started with a 15/44 gearing and it got hot way too quick. This 13/44 setup worked great in my sessions at the track up until the race. I think the big thing was that the track was dampened down for traction and therefore put much more strain on the motor than I had ever had before. The dry dirt is much more forgiving, you know?

I have no problem going with the 1515, but I just want to make sure that it can handle that kind of race situation. If spending a little more on the 1521 will avoid this problem, I'm there. That's what I'm trying to figure out.