Ok quick update,
I had my wheel rebuilt with another SP hub, it was too complicated for anything else, this solved the problem, however, after the last long ride that I did, I noticed on a subsequent short outing that the wheel was again rubbing on the brake blocks when I was climbing.
The communication from the wheel builder regarding the actual problem with the last hub, was that I had just completely destroyed the bearings in the hub.
Now as the problem has reoccurred in the same type of hub, with every other variable remaining essentially the same, I am assuming that the bearings in this hub have also been destroyed.
The original purchase of the SP is now over two years, and I was assuming that the original guarantee would therefor no longer be valid.
I am left with the choice of either purchasing a brand new SP hub, and accepting that I will probably only get two years from it, using a Shimano hub, and accepting the increase in comparative resistance, or purchasing a Son Delux hub with a wide flange
Would the change in flange size make a difference?
What rim would you use? this is for a old style Audax bike for want of a better description max tyre width is 28mm with mudguards
I like the Archytpe H-plus son rims.
Interestingly, I have another dynamo hub on my commuter (Fixed wheel) that has a USE dynamo hub, which looks the same and I believe its either built by SP or built under license by USE, which gets a lot of abuse (I climb a "strava cat 4 hill" each day on my commute). the rim is a DT swiss 440, again using 28mm tyres, and there is minimal flex in this wheel. this is now two years old, and was secondhand when i purchased it.
The forks on this bike are steel (531 I think).
So is the USE hub of greater strength than the SP hub or could it be the rim/ hub combination or could the difference in fork material have any bearing (Carbon vs steel)?
( I like the fit and forget aspect to dynamo lighting, and regularly forget to charge USB lights and have limited luck with battery lights)