thanks for all the fabulous reply, i got a very general idea what to do,

here we use 1/10 foam because we ran on rough asphalt surface, also most minis drivers here are also Nitro 1/10 drivers, usually they will use the left over foam on the mini...we really lower down our mini to make it fit the big tyres... our usual foam thickness its about 3 to 4 mm off rims...

as for me, i don play nitro, so free recycle foam tyre for me.....

most driver here drive their mini with ezrun 9 t brushless....so the impact damage its sky high...

as for me, i am still with stock tamiya esc and black can......very slow compare to them... i have all the bl systems also, but god know when i will run them.....

advise taken, will run more practise run to find out....thanks....