The Wheele SUP Standup Paddleboard and Surfboard Bike Trailer Bicycle Attachment Board Carrier Designed by a surfer for a surfer, completely hassle-free & ultra light Can hold up to 2 boards at once Exceptional on & off-road stability and maneuverability Heavy duty lightweight storage bag holds gear for hands free riding NOTE: You have a choice of 2 size hitches! Choose standard size which fits most bicycle seat posts. If your seat post is over 29mm, specify the oversize hitch with your order