For bashing i would say that a 13.5 would be too slow to be honest, you'd be better with something like an 8.5.
I have a 13.5 in my b44 and racing indoors, i gear at about 6.0 ratio with a 78 spur and roughly at 32 or 33 pinion. The car isn't that quick outdoors with a 4200 lipo but for our small indoor track it is ok. I will be upgrading to a 10.5 soon though.
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