They are only available with this P-Bandai set

Speed (second @ 60 degree):

Length: 149

The Churchill tank stable is classified into several types according to the main armament used

with the Venture SBK (Scale Builder Kit)

Exotek Racing - WR8 Speed Chassis Conversion, for HPI WR8 Flux ASC40007C They are only available withHigh speed carbon fiber chassis conversion set for the HPI WR8 FLUX GYMKHANA 1 8 4WD Rally Car. Extra light weight conversion that removes all of the unneeded parts and hardware, transforming the WR8 into a super streamlined and race worthy performance chassis. The conversion is about 220gr lighter than the stock set up! Rigid but very light weight carbon fiber chassis is mated to a reinforced alloy nose plate for durability. Optimized weight balance