Yeah, if I can have my choice between Super Record and Record, I'll probably take SR every time. Plus, you can see the cup from the nds, and the original vintage one always looks better. just for the perfectly measured offset spindle.
But if I could have easily found a Chorus loose ball bb - even if it's another 50 more grams - I would have grabbed it in a heartbeat. I chose a new $35 Taiwanese bb for my Miyata with its first gen Chorus crank. When it's a keeper, period correctness is almost always important. I know the spindle is the correct taper standard, perfect length on both sides, I trust it, and I'm usually confident it won't be a problem to overhaul, maybe several times during the bike's life. I much prefer the unit actually engineered for that particular crankset. But if this Miyata were an upper-mid-level 912 with an original bb hollow spindle, those 50 grams aren't that big of a deal. For me- this would be an easy place to save weight without ruining the looks of the bike. A more modern cartridge type with aluminum cups would be around 200-250g. All I know is- an all steel loose bearing BB as found on these old mid-range bikes, would be over 300g. How would that last? You're probably right that all the loose ball BB's are steel. I don't know of any vintage steel or ti spindle that actually fits into aluminum cups. They don't actually serve the same purpose of c&v steel cups which secure/adjust the ball bearings. (Or they use other steel parts like cones and lock nuts.) These aluminum (or plastic) "cups" you're referring to simply hold that cartridge in the frame. You're also referring to cartridge bottom brackets where the steel spindle is sealed within a body of two bearing cartridges which are also made of steel. I'm referring to a DA cup & cone bb from the early '80s, not a cartridge unit from 2000.
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