I would say Nitro Gear but they pissed off a lot of people including myself recently. They ran a sale and did not honor a lot of sales and people's cards were hacked.
Check revolution gear and axle or east coast gear supply.
ECGS has nothing...
this question was simple is anyone running Black hawk or Supperior radius arms and what info you have on them.. JMAX is another company's radius arms I am interested in.
not opinions on oem arms caster plates how strong alum is over steel...