Looking to build a dynamo hub wheel that I can swap between two bikes - one with 15mm thru-axel, the other a traditional 9mm QR. Is there a model that is easily converted (via end caps, etc) between 15mm and 9mm?

SHutter Precision PD-8X Power 6-Bolt Disk.
This is supplied as a 15mm bolt through with a reducer for QR included for about 150 quid.
Nuf said!

With the SP you also get the opportunity to flip a coin and either get a million miles of sturdy service or 5 minutes use before it seizes up or the bearings disintegrate.

I'd go for a Son next time.

That's true. But you'd need to buy 2 SONs because they don't convert between dropout standards. At least mine doesn't but it's an old Klassic.

I've been using one of the SP reducers in my Son 15mm hub with no problems at all. Not sure how easy they are to get hold of by themselves though? My local bike shop had a spare that they kindly let me have.

mje25 wrote:I've been using one of the SP reducers in my Son 15mm hub with no problems at all. Not sure how easy they are to get hold of by themselves though? My local bike shop had a spare that they kindly let me have.

Lots of brands do them. I have a ritchey one and CRC sold them branded as Nukeproof or one of their other in-house firms.

*edit*
An engineering firm would also be able to knock you up one without too much hassle. My mate had a 12mm one made.

Sounds like problem solved then. I hadn't realised they were so readily available. I suppose it's not really something you look for that often!

Both my SP's have been fine but my son puts out a lot more power at lower speed's. I'm about to try an Alpkit one shortly to see what they are like, but ideally I would go with son.