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AST AST Linear Race Springs - 140mm Length x 90 N/mm Rate x 61mm ID - Single
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AST Linear Race Springs - 140mm Length x 90 N/mm Rate x 61mm ID - Single

AST
ASTAST-140-90-61
astAST-140-90-61
Coilover Springs
2 Units In Stock - Ships Next Business Day
$ 95.00 $ 85.50
$ 85.50

SKU: AST-140-90-61 | UPC: astAST-140-90-61

AST Linear Race Springs - 140mm Length x 90 N/mm Rate x 61mm ID - Single for Porsche 911 BMW M3 Miata

AST Linear Race Springs provide exact 90 N/mm rates in a compact 140mm length with 61mm inner diameter for demanding coilover applications. These springs suit Porsche 911 GT3 BMW E92 M3 Mazda MX-5 Miata NC and similar track cars requiring stiff precise suspension. Drivers gain sharp turn-in reduced squat and sustained grip during extended sessions.

Key Features

  • 90 N/mm Linear Rate: Delivers steady progressive force buildup for neutral balance and driver confidence on track
  • 140mm Free Length: Fits compact strut assemblies without binding maintains ride height under load
  • 61mm Inner Diameter: Matches standard coilover perches secures firm seating eliminates play
  • Chrome Silicon Steel Construction: Resists fatigue endures heat cycles lasts through racing seasons
  • Shot Peened Preset Finish: Ensures roundness removes stresses prevents sagging over time

Product Notes

  • Sold as single spring order pairs or sets as needed for front rear setups
  • Confirm perch and damper dimensions match before install
  • Packaged to prevent distortion during transit

Installation Notes

  • Professional installation recommended.
  • Use heavy-duty spring compressor rated for race springs
  • Compatible with AST coilovers and aftermarket perches matching 61mm ID

This Part Fits

Year Make Model Submodel
2007-2013 BMW M3 E92 E90 E93
1999-2008 Porsche 911 GT3 996 997 Carrera
2006-2015 Porsche Boxster Cayman 987 981 S RS
2006-2015 Mazda MX-5 Miata NC Track Models

Why Choose AST?

  • Track-tested in GT3 endurance series worldwide
  • CNC-wound from premium imported steel meets motorsport standards
  • Engineered by suspension specialists for repeatable results

Frequently Asked Questions

  • Q: Will this spring fit my Porsche 911 coilover kit?
    A: Yes fits AST 503 530 series and compatible perches on 997 991 GT3 Carrera models verify damper thread length
  • Q: What material and finish does it have?
    A: High-tensile chrome silicon vanadium steel shot peened stress-relieved with ground flat ends for precise seating
  • Q: What warranty coverage applies?
    A: Lifetime against manufacturing defects sagging or breakage when used in approved applications register for full terms

Shipping & Handling

  • Method: UPS Ground
  • Availability: In stock - ships same or next business day
  • Packaging: Protective cardboard tube 6in x 4in x 4in
  • Weight: 2.2 lbs

Request For Information

Have questions about AST Linear Race Springs - 140mm Length x 90 N/mm Rate x 61mm ID - Single? Fill out the form below and we'll get back to you by the next business day.
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