Seat tube measures 56cm center to top, top tube is right around 55.5cm. Comes with Deity post clamp & Profile Designs BRC carbon fork.It's used & has some paint chips & scratching, I would consider good condition overall though. It's a 1 1/8 headtube, takes a standard English bottom bracket & 31.6mm seat post. Not quite sure on the year but it's Chehalis Washington made. Please check the pictures and let me know if you have any questions. The item "Vintage Klein Quantum frame with carbon fork" is in sale since Thursday, May 27, 2021. This item is in the category "Sporting Goods\Cycling\Bicycle Frames". The seller is "jrleblan" and is located in Asheville, North Carolina. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, South africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Mexico, New Zealand, Singapore, Switzerland, Norway, Saudi arabia, United arab emirates, Qatar, Kuwait, Croatia, Malaysia, Colombia, Barbados, Bangladesh, Bermuda, Brunei darussalam, Bolivia, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Cayman islands, Liechtenstein, Sri lanka, Luxembourg, Monaco, Macao, Martinique, Maldives, Nicaragua, Oman, Pakistan, Paraguay, Reunion, Uruguay.