Try comparing them here...
[link=http://translate.google.com/translate?hl=en&sl=ja&u=http://www.kyosho.com/jpn/products/rc/detail.html%3Fproduct_id%3D100350&sa=X&oi=translat e&resnum=8&ct=result&prev=/search%3Fq%3D3%2Bsite:http://www.kyosho.com/jpn%26hl%3Den%...%3Dall]Caliber 3[/link]
[link=http://translate.google.com/translate?hl=en&sl=ja&u=http://www.kyosho.com/jpn/products/rc/detail.html%3Fproduct_id%3D100350&sa=X&oi=translat e&resnum=8&ct=result&prev=/search%3Fq%3D3%2Bsite:http://www.kyosho.com/jpn%26hl%3Den%...%3Dall]Caliber 30[/link]
If you can't understand well...
Can anyone read Japanese on their pc ad translate?