Just doing some research on the TB-01 chassis, here's a description from a website I found. Interesting, huh?! Looks like it was meant to be a rally car to begin with. Very interesting!
Designed from the ground up to tackle off-road terrains
, the TB01 is yet another shaft driven entree from Tamiya. Aimed at the rally driver in all of us, the TB01 in its stock form comes with extremely durable steel gears. Hey, they're heavy yes, but for off roading they can take all the punishment and come back ticking.
The TB01's tub chassis has been designed to be fitted with foam pieces all over the entry ports to prevent particles from polluting the insides of the chassis. Not shown in the picture is a rally dust cover which totally surrounds the TB01. The rally block tires also grip great in sandy conditions.
The TB01 can be used for touring races too, simply lower the ride height, and swap on racing slicks and you are ready to go! For the more competitive racer who'd like to really soup up their TB01s, get the TB01 Long Arm Suspension set and TB01 Carbon Frame Set. To further lighten the drive train, a lightweight aluminium centre shaft is available, and the differential ring gears do come in light weight versions.