Adjusting the chain on an S4R

[rjc]

Ok, so contrary to the handbook's recommendation that the bike needs to be booked in for chain adjustment (!!!!) I have realised that it can be carried out by a mere mortal. So here's the question. Once the 2 14mm nuts are loosened on the swing arm what size c-spanner is needed to rotate the spindle?

Anyone know?

[logyk]

I believe a suitable c spanner was provided with the 916/996/998/748 series .
The tool kit (?) with the S4R leaves a lot to be desired.