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with phil wood or white industries titanium axle.
Not worth it titanium are lovely, but a lots of money just to save a bit of weight, and more chance of the axle breaking.
If you really want to keep the weight down, go for a Shimano Hollowtech II chainset, stiff, light and the external bottom bracket can be have for so little, that if you replace it regularly, it still be cheaper than an expensive square taper.
With that in mind if you're still persistent in going for square taper (for reason I can emphasised and understand).
Best to stick to either the trusty Shimano UN55 bottom bracket, for go for the SKF bottom bracket.
The UN55 is in my opinion, the best value bottom bracket and also the most reliables.
The SKF is a massive step up, and I would go as far as to says it'd be better than Phil Woods (especially in value), they have better weather sealing and should last even decades.
My advice is to go for the UN55, because they're so cheap, I have seen and build bicycle whose UN55 (and the previous generation UN54) bottom bracket is still the picture of health after many years.
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Good shout on the White Industries G30, I might get those for my touring bike.
(For what it's worth, I ran a White Industries VBC with the Shimano UN54 as it was called, and the bearing is still smooth after 10,000km, including the 1400k London-Edinburgh-London, 600k Bryan Chapman Memorial, a handful of 400k and dozen of 200k).
For my next touring tandem custom bike, I think I will choose square bb, with phil wood or white industries titanium axle and white industries vbc crankset x2. What do you think about that configuration ?
First I wanted WI G30 crank but the chainine will be not good with the rolhoff for my framebuilder.