Originally Posted by
Kimmo
I'd say the two bolt recommendation is based on the likelihood that some single-bolt designs won't open far enough.
The shape of the one bolt clamps aren't compatible because the rails are oval. zzyzz_xyzzy also has a good point about clamping torque. The torque recommendation for the SLR is 6 ft lb. If I tightened my one bolt clamp to 6 ft lb the saddle would tilt after a short ride.