Maybe its just me but im not a fan of the hd ball cups i like the rpm ones and im not a fan of the big bores on the 210 i need a little more time with them and im sure ill get a good setup but i have smallbores on my 210 atm and lovin my 410r with a few upgrades biggest is metal suspension hangers but lik the small bores on it but to b fair i havent raced it on a bumpy or outdoor track yet but will l8r in the year