and on hubs 150mm has been round for yonks as a DH standard.
135/142 is essentially the same hub with different axle configs for different dropouts.
The choices are
135 QR – probably what you have
135 10 (and maybe 12)mm axle – if you put a bolt on normal dropouts instead of your QR
142 12mm for a dedicated 142mm setup which is bolt only and a little wider.
If you are going Hope the 135/142 is the same hub with different end caps for Pro II Evo and later. Pro II is 135 but can have the innards swapped to make it 142.
Ah, well that’s all nicely explained. Cheers for that 🙂 yes sounds like a reasonably simple process going to bolt through from qr – pop end case off, swap axle, new caps on and go ride! Have to love hope for that bit of cleverness