The Zed came with a 190/50 and it tended to stand up mid corner over bumps... I've now got a 190/55 on and with the different profile it's way better, more stable while cranked... 6" rim on the Zed... The 190/55 has a profile similar to the 180/55 on a 6" and 5" rim respectively... apparently.
And for the record... the 190/55 is actually narrower than the 190/50 was...
It's an age old debate, on just about every forum I've been on.... Don't think I'll bother with a 180 to be honest...
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