Any preference between 6-bolt and center lock rotor for polo? Is one better than the other in terms of robustness, weight, set up?
I read somewhere 6-bolt is better because it doesn’t require a cassette lockring tool and big wrench.
What about the unused disc mount on the rear hub? Is 6-bolt or CL better or worse for polo in terms of weight or getting damaged being on the bike without a rotor mounted?
rear doesnt matter , ive never heard of damages on the hubshell
for the front 6 bolts allows you to run the cheapest rotor discs ( 5£ clarks works great for me and the metal pads)
center locks discs are more expensive / linked with heat dispersion systems its a bit useless and expensive if you bend them often at polo
are you also dusting off dillman and halvoersen ?
There is always play wtih center lock after a moment,
If you are buying a rear hub and are wondering whether to get centrelock or ISO disc mount I would consider which one has the greatest distance between the flanges as that will make for a stronger wheel. When deciding which onyx rear to buy, given there is currently no non-disc option, I went for centrelock as it slightly increased the flange to flange measurement…
Yeah, Im actually leaning toward getting a set of Paul hubs with a WI freewheel. Paul actually makes a single speed non disc rear hub. So the flanges are wider spaced than a disc hub…. But the flanges are low and don’t match the front disc hub 
Good point about cheaper to replace rotors on the 6 bolt
I talk to Dillman and Kremin often yeah we probably should dust those guys off
this flange spacing theory is def not to take in account, there is loads of builds on 11 speed cassettes hubs and ive never seen a failure due to this
what ive seen a few time tho, is a freewheel stripping the threads clean on a hub ( or is it the opposite ?)on some repeated joust acceleration.
also cassettes allow to ride different ratio easily ! some courts are wide some are narrow , and no one wants to spin around big cities on a polo ratio so commuting gears are common
the only good thing about the paul hub / wi setup is the weight , and ive seen them last 15 years too