TBF they were fragile but very fast and light for the size.
And available with tanwalls.
I gave up on mine once they had over 100 seeping holes between them. Cut them up afterwards and they have the thinnest tread ever, and no breaker layer (I think the Plus version does, but not available in 650b).
Have gone to G-One Speeds. No tanwall though.
@chez_jay started
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TBF they were fragile but very fast and light for the size.