In reply to girlymonkey:
Savi {she} pretty much paces herself now, it's just down to her knowledge and experience, pretty much how she's feeling on the day, I don't allow her to take the full load through her harness and always leave a little slack in the line, with that in mind she'll pretty much go full canter about two miles along the beach till she's warmed up then will settle back into an efficient smooth canter till the grass shore at Barassie where she'll explode again into an all out gallop, I'll be onto the mtn bike big ring to keep up.
Her familiarisation took six or more months, when she started she did a funny fast trot, reluctant to canter, only breaking into canter for short periods, but soon that lengthened till it was canter all the way.
The sand and salt water wreck the bikes drivetrain and brakes, but the sand and grassy route is the best I have for her paws and joints, except on hot sunny days when the sand can burn also be aware these energetic, athletic working type dogs will sooner or later over do it, stain a tendon, tear a paw, or twist a wrist, the only thing we can do is be wary of the occurrence, and cease exercise immediately.
I gave you a bum steer. the pipe clip and the lead both secure around the steerer tube spacers, I have three of them just below the stem mounting.