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The Shimano BB91 bottom bracket isn't 91mm wide though. It's 86.5mm wide for road bikes, as the Canyon e-mail says, and is effectively the same as BB86. BB91 is the Shimano model designation rather than a different BB spec. The bottom bracket will be 86.5mm x 41mm, so a SRAM BB86 GXP BB will be fine, as @Juggle says.
Brommers
Rotor 4130 bearings squeeze a 30mm axle into a 41mm shell by using double row bearings, listed as suitable for BB86 with road cranks and BB89 and BB92 with MTB cranks. I have no idea whether the road axle is long enough to work with these bearings in a 91mm shell, although it seems very unlikely as the road spec. calls for just 0.5mm spacers each side with an 86mm shell