Converting Carson Thor (Vulcano) 23 mm to standard 17 mm Hex wheels The Carson Thor (also named Vulcano) has special 23mm Hex wheels which are virtually not available anymore. The solution is to convert it to default 17 mm Hex wheels I've used this hex wheel hubs, they are a litte bit narrower than the original but that's ok https://www.ebay.de/itm/156135350611 below are the exakt same tires in 17 mm Hex Carson part number: 500900077 other alternatives Carson part number 500900106