Tony, There seems to be a silver DH-3N80 with 36 holes available here (in Germany). There's also an XT dynamo hub (Silver, aluminium axle, 36 holes. DH-T780.) but I don't know how it compares to Shimano's other dynohubs.
These pages are in German, I'm afraid: DH-3N72<http://www.bike-components.de/products/info/p20545_Nabendynamo-DH-3N72-.html> DH-3N80<http://www.bike-components.de/products/info/p17322_Nabendynamo-DH-3N80-.html> DH-T780<http://www.bike-components.de/products/info/p30868_XT-Nabendynamo-DH-T780-.html> I can't see any mounting points for disc brakes on any of the photos, and they all say they're designed for rim brakes (Bremssystem: Felge). You might be able to use those product numbers to find websites in English where the hubs are sold, but if not Google translate will do a job for you. Just let me know if you need any help with the DE pages! Tom -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/groups/opt_out.
