ERS Main Metric Dia. 2.36 in Len: 4.72 in Rate: 1370 lbs in Eibach ERS Coil Over Spring Single Spring 9.00 inch L x 2.25 inch dia x Eibach ERS 225mm Length x 70mm ID Coil Over Spring eBay Eibach ERS Race Main Spring Length 7" Inside Diameter 2.5" Rate. 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