It can work either pushing the chain up or pulling down, depending on what you prefer, and the jockey wheel has sealed bearings, which is a nice touch. As with most single speed kits, this fits standard Shimano freehubs and you use the spacers included to get the chainline right.The item "Singlespeed Conversion with Gusset Squire SS Tensioner, 2 Chains & 2 Sprockets" is in sale since Monday, November 23, 2020. This item is in the category "Sporting Goods\Cycling\Bike Components & Parts\Cassettes, Freewheels & Cogs". The seller is "henkisback" and is located in Bristol . This item can be shipped to United Kingdom, Antigua and barbuda, Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Australia, United States, Canada, Japan, New Zealand, China, Hong Kong, Norway, Indonesia, Malaysia, Mexico, Singapore, South Korea, Switzerland, Taiwan, Thailand, Bangladesh, Belize, Bermuda, Bolivia, Barbados, Brunei darussalam, Cayman islands, Dominica, Egypt, Guernsey, Gibraltar, Guadeloupe, Grenada, French guiana, Iceland, Jersey, Jordan, Cambodia, Saint kitts and nevis, Saint lucia, Liechtenstein, Sri lanka, Macao, Monaco, Maldives, Montserrat, Martinique, Nicaragua, Oman, Pakistan, Paraguay, Reunion, Turks and caicos islands, Aruba, Saudi arabia, South africa, United arab emirates, Bahamas, Colombia, Kuwait, Philippines, Qatar, Uruguay.