It does sound like a lot for a M10 nut, but the Bandit has a similar spec (60Nm) so the 69Nm is probably right.
It is possible to be too careful with a torque wrench, and overtighten the nut. If you try to approach the final torque setting a bit at a time you are likely to overtighten. On a rear sprocket I'd do the criss-cross business to about half the torque setting, then tighten each nut to the final torque setting in one go. Never had any problems that way.
It is possible to be too careful with a torque wrench, and overtighten the nut. If you try to approach the final torque setting a bit at a time you are likely to overtighten. On a rear sprocket I'd do the criss-cross business to about half the torque setting, then tighten each nut to the final torque setting in one go. Never had any problems that way.