since we are talking about inserts...

aka more forward bite less side, proline more side less forward..

my older proline foams used a while now get really soft so I just fill the rim with some tape...

Here at my track it is kind of preference, honestly I can't tell unless I have 2 of the same tire mounted on each, and i don't....I just stuff my jc stuff with proline, proline tires with proline, losi with aka, proline doesn't fill em...sweep with aka hot bodies with aka

does anybody actually know what each do different? UGH so many stupid tires...