Regardless of your crop tillage practices, look to Unverferth for the extensions you need to center your wheels down the middle of the row. From dual and triple axle spacers, to MFWD hub extensions, your Unverferth dealer can put you and your wheels on track. Standard extensions for spacing dual wheels further apart or adding triples are available in 5-, 8- 10-, 13-, 15- 19.5- 21 and 29.5-inch lengths for keeping your wheels running down the rows. A wide variety of other wheel extensions are also available to space out M.F.W.D. fronts, self-propelled sprayers and a variety of popular tractor makes and models. Custom-built extensions can be designed and manufactured in lengths from 4-inches to 40-inches with a wide variety of bolt patterns. - Less