Billet 11" Rack11" Mini Sand Rail Rack & Pinion Steering Unit The Desertkarts.com 11" Rack and Pinion Steering Unit is well suited for all light weight karts and mini buggies. Any off-road kart running ATC type tires will benefit from this unit. Originally designed as a sand rail rack and pinion unit it is very strong for our application and for use as a "Mini Baja" rack and pinion. The 11" and 14" racks are both used by many universities. The 11" is measured from center to center of the adjustable rod ends. (Included) This rack has a 5/8" 36 spline input shaft. The ratio of the rack and pinion is 12:1 this equals 1.5 turns of the wheel is 4 inches of rack travel "lock to lock". 11" Mini Sand Rail Rack & Pinion Steering UnitThe Desertkarts.com 11" Rack and Pinion Steering Unit is well suited for all light weight karts and mini buggies. Any off-road kart running ATC type tires will benefit from this unit. Originally designed as a sand rail rack and pinion unit it is very strong for our application and for use as a "Mini Baja" rack and pinion. The 11" and 14" racks are both used by many universities. The 11" is measured from center to center of the adjustable rod ends. (Included)This rack has a 5/8" 36 spline input shaft.The image below should answer most of your questions concerning this item.The ratio of the rack and pinion is 12:1 this equals 1.5 turns of the wheel is 4 inches of rack travel "lock to lock". This Buggy Rack & Pinion measures 11" from eye to eye and weighs approx. 2-1/4 lbs.. The pinion will travel 3/4 of a turn from center to lock. The rack will travel 2-1/4" from center to lock. Distance between mounting holes is 1-5/16". The width of the body is 1-1/4". Has 5/8" x 36 spline input pinion shaft.