No it's your scale. asfik there is like 1-2 1:10 in existence and they are limited run custom built. Not much luck there
but look here. 1:16 and 1:8 and you can even push 1:5 if you so wish
http://www.chunwai-model.com/Shop/Sh...asp?ClassID=19
they sell tracks separately. im sure they will sell you sprockets too if not listed on site.