Hi all,

I have a rad city 5 plus step-thru that I purchased last April. Naturally just after my warranty is up... I get an error 21 issue. Thought it was the cracked top battery mount, but after replacing that today I still have error 21.

I think it's a controller issue, and I think it's most likely a cable failing because the controller is so crammed into the space in the bottom of the bike's frame.

So my question would be, since the bike is out of warranty now anyway, is the Area13 upgrade kit working on anyone's radcity? The product page says it's not officially tested by them on it. Do I go with area13 or buy yet another rad controller? Maybe I'll ask for two so I can replace it in another 8 months lol