Would that friend be Ray? Sounds like something he told me a couple of years ago. I've seen vids of some people going pretty quick on the M&H, but have no personal or close second-hand experience.

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When people are referring to M/T, please remember they currently have three 275/60R15 offerings:
- ET Street S/S, which is DOT legal and supposed to be like the original ET Street construction, only w/ additional grooves
- ET Street R, which is DOT legal and built more like the ET Street Pro, only "just enough"grooves that M/T still promotes it as a street-legal option
- ET Street Pro, which is not DOT legal for highway although some people run them on the street like GY3 does

The original and the S/S have steel belts in their construction. The R and the Pro do not, which is why their sidewalls behave differently (and likely part of why they hook better w/ what's supposed to be the same compound).

The original ET Streets on my old car never had any balancing or out-of-round issues and were smooth up to 125+ MPH. The ET Street S/S on my 1320 (305/40R18, not 275/60R15) do act a bit "funny" at maybe 90+; not sure if they need to be rebalanced due to possibly spinning on the rims after some track time, or and indication that they don't run true that's showing up on the big end. It's not scary, but it's there... feels like hitting a bumpy section of the track when it starts doing it.

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I don't know what the Nitto NT555RII would do on my old car, although it would probably be "OK" on my 1320. From a few reviews I've seen, they sound like the work decently when new, but get baked from repeated heat cycles and don't grip as well even when there's still a lot of tread on them. The do make a 275/60R15, but I don't know anyone personally that runs that size.



FWIW, tread patterns from left to right: NT555RII, ET Street S/S, M&H