ERS Linear Main Spring Dia. 1.88 in Len: 8.00 in Rate: 300 lbs in ERS Main Metric Dia. 2.36 in Len: 4.72 in Rate: 1370 lbs in Eibach ERS 18.00 in. Length x 3.00 in. ID Coil Over Spring eBay Eibach 1000.1880175 Eibach ERS Coil Over Main Spring 803050111807 eBay Eibach 120 60 0220 Eibach ERS Coil Over Main Spring 803050352545 eBay. Eibach's ERS line has evolved over the years to be the world's most prominent, comprehensive and superior Race Spring System. Eibach Race Springs are all manufactured in series production, often repeated, with a strong manufacturing experience. Thus, Eibach constantly achieves the most linear spring characteristic (rate) while maintaining the lowest tolerances and the highest quality in the industry. Eibach's ERS line has evolved over the years to be the world's most prominent, comprehensive and superior Race Spring System. Eibach Race Springs are all manufactured in series production, often repeated, with a strong manufacturing experience. Thus, Eibach constantly achieves the most linear spring characteristic (rate) while maintaining the lowest tolerances and the highest quality in the industry. Standard Features Eibach Coilover Springs Designed Specifically for Quarter Midget Racers Maximum Travel in Combination with Smallest Block Heights Ultra Lightweight for Reduced Unsprung Mass Each Spring Individually Tested Highest Linearity and Guaranteed Consistency Specifications Part Number 0350. 163. 0115 Part Name Coil Spring Length 3. 5 in. Diameter 1. 63 I. D. Spring Rate 115 lbs in Block Height 1. 06 in. Travel 2. 44 in. Block Load 280 lbs. Spring Type Linear Individual Motorsport Spring Notes Without QuadraSteer