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There are several varieties of these straps but the ratchet type is easier to compress the suspension than the pull strap type, and they are available at most home centers and discount stores. Pay attention to the Working Load Limit of the straps you get and choose a strap that has a working load limit of at least half the weight of your motorcycle. For instance, if your bike weighs 650 pounds, find a strap with a working load limit of at least 325 pounds each. Most one-inch nylon straps will have this rating. A wheel chock is a sturdy material made of metal or hard plastic that is placed around the front wheel of the motorcycle to inhibit it from moving. While the wheel chock is not a requirement to trailer your bike, it certainly makes the chore much easier, especially if you are loading and strapping without the assistance of a friend. If you do not have a chock then park the bike at the very front of the trailer. If there is a rail on the trailer your front tire should be pressed against the rail. Push the bike up the ramp into the bed of the trailer, placing the front wheel into the wheel chock. Place the front wheel of your motorcycle into the wheel chock. A general rule for strapping anything is to attach the straps as high as possible on the bike and as low as possible on the trailer for the greatest holding power. Use an "X" pattern for maximum stability.  Start with the front left strap (as viewed from a sitting position on the bike). Secure one end of the strap to the trailer and the other to a rigid point on the frame or triple tree. Tighten the front left strap until it is taut. Next, attach the front right strap in the same manner as the front left strap. Since your bike is on the side stand it will be leaning to the left but in the end, we want the bike to be perfectly vertical when secured. You may want to use some soft loops on the motorcycle end of the strap, to protect the bike, then attach the ratchet strap to the soft loop. Secure the other hook end of the strap to a secure spot in your truck or trailer, preferably on an angle. Pull the slack out of the strap and ratchet it a few times. Repeat this same process for the right side. Tighten each ratchet strap so that the bike will sit in the upright position on its own.  You will notice the bike start moving into a vertical position and your front suspension compressing. Once the bike is vertical you will want to tighten the left and right sides equally until the suspension is completely compressed. Don't strap the handlebars. Most manufacturers say that it's not safe to attach ratchet straps to the handlebars because they are simply not designed to take the pressures that will be exerted by the straps and a bouncy road. Remember to secure the straps rearward of the motorcycle so that the rear straps put counter tension on the front straps, making your bike an immovable fixture on the trailer. Do not tie the straps to guards on saddle bags or trunks as it is likely you will pull the guards off during transit. Again you will want to compress the suspension as you ratchet the straps.
Get some ratchet straps. Get a wheel chock for the front of the trailer. Use the ramp to load the bike. Put the side stand down and attach the straps. Secure the straps to the trailer and ratchet them down. Strap the rear of the bike.