Attaching at the center of the bicycle gives a more stable ride.
The ball joint rotates freely for a wider arc of motion without off-balancing the bicycle and rider.
MEASURING YOUR SEATPOST
To determine the hitch size, loosen your bicycle seatpost and pull it up and off of the bicycle. Most seat posts have the metric measurement stamped near the bottom of the posts.
For those without the stamped size, measure the exterior diameter (from outside to outside across the middle) using a metric caliper. The bike industry does not use the circumference, which is the measurement that a tape measure around the seat post would give you.
Any bike shop should be able to measure the seatpost for free or for a minimal charge. Accuracy is important. Please call if you need more help.
OTHER CYCLETOTE SEATPOST OPTIONS
If you cannot connect to your seatpost and want a wishbone style tow bar that attaches in the center consider a rack hitch.
If you want to attach on your rear wheel at the skewer.
*If your old hitch had a ball attached to the hitch, you will need to also purchase a Ball Joint Upgrade.
** If you need to do a Ball Joint Upgrade and you also have the Automatic Trailer Brakes, you will need only a ball joint and a hitch nut.