SKU: 83420081708

MS1-HDR4 - HD/Race Rigid 4 Pad

Sale price$218.70 Regular price$243.00
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Description

MS1-HDR4 - HD/Race Rigid 4 PadSpecifications: Item Description: HD Race Rigid 4 Pad Product Weight (lbs.): 14. 4 Torque Capacity (ft lbs.): 420 Torque Capacity Over OE: 72% Disc Material: Ceramic Clutch Disc Diameter (Inches): 9. 4 Clutch Disc Diameter (Millimeters): 240 Input Shaft Diameter (inches): 1 Pressure Plate Type: Heavy Duty Warranty: 12 Months Description: The MS1 HDR4 kit features ACT's renowned Heavy Duty pressure plate, optimized for racing applications. ACT Heavy

Specifications:

  • Item Description: HD/Race Rigid 4 Pad
  • Product Weight (lbs.): 14.4
  • Torque Capacity (ft/lbs.): 420
  • Torque Capacity Over OE: 72%
  • Disc Material: Ceramic
  • Clutch Disc Diameter (Inches): 9.4
  • Clutch Disc Diameter (Millimeters): 240
  • Input Shaft Diameter (inches): 1
  • Pressure Plate Type: Heavy Duty
  • Warranty: 12 Months

Description: The MS1-HDR4 kit features ACT's renowned Heavy Duty pressure plate, optimized for racing applications. ACT Heavy Duty pressure plates utilize an exclusive diaphragm design to bolster clamp load, reduce deflection, and extend clutch life. Each diaphragm undergoes a meticulous four-stage heat-treating process for unparalleled performance. Precision cover stampings ensure rigidity and consistency in ACT pressure plates. The 4-pad rigid race discs are engineered with top-tier ceramic friction materials, with a chrome-moly hub heat-treated for maximum strength and durability. The lightweight, rigid design enables quicker shifts and seamless, trouble-free operation. Expect harsher engagement with the 4-pad rigid race disc, but enjoy faster shifting. This disc is particularly suited for smaller disc sizes in compact engines.

Features:

  • Feel: Light to moderate pedal effort, aggressive engagement, increased gear rattle
  • Life: Moderate friction life, extended by ACT's exclusive diaphragm design; rigid design may increase spline wear
  • Quality: Carefully engineered, precisely assembled, accurately balanced, uses select ceramic friction materials for high heat tolerance and maximum performance
  • Recommended Use: Recommended for race use only
  • ACT Difference: 100% clamp load tested and dynamically computer balanced for smooth high RPM reliability

Fitment Info:

  • Application: Engine
  • 1987 Chrysler Conquest Base: 2.6 L4 GAS FI 2555cc | SOHC | Turbocharged
  • 1987 Mitsubishi Starion ESi-R: 2.6 L4 GAS FI 2555cc | SOHC | Turbocharged
  • 1988 Chrysler Conquest TSi: 2.6 L4 GAS FI 2555cc | SOHC | Turbocharged
  • 1988 Mitsubishi Starion ESi: 2.6 L4 GAS FI 2555cc | SOHC | Turbocharged
  • 1988 Mitsubishi Starion ESi-R: 2.6 L4 GAS FI 2555cc | SOHC | Turbocharged
  • 1989 Chrysler Conquest TSi: 2.6 L4 GAS FI 2555cc | SOHC | Turbocharged
  • 1989 Mitsubishi Starion ESi-R: 2.6 L4 GAS FI 2555cc | SOHC | Turbocharged

PROP 65 WARNING: This product can expose you to chemicals including carbon black, glass wool fibers, and silica (in clutch discs), chromium and nickel, which are known to the State of California to cause cancer or birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 83420081708

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Lauren
Waukegan, US
★★★★★ 5
Great fit, truly doesn’t slide off heel
Number of Items: 3, Color: White/Neutral (3-pairs), Size: Medium, Number of Items: 3, Color: White/Neutral (3-pairs), Size: Medium
I’ve scoured all the lands looking for a no-show sock that was 1) thin, 2) quality, soft, breathable material, 3) didn’t dig into my feet/heels, 4) doesn’t shrink, and most importantly 5) stays on the back of my heel without a bulky non-slip rubber piece and these check all the boxes! Perfect for low profile women’s work shoes like Keds, etc. Not low enough for most flats though. I wear a women’s size 9.
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Reviewed in the United States on April 19, 2025
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Elliz
Los Angeles, US
★★★★★ 5
So good - I’m buying MORE.
Number of Items: 3, Color: White (3-pairs), Size: Medium
I’m gonna give you more detail than you need about why I’m buying these socks again. I’ve been the mom of girl athletes. I’ve been a model and a fashion director. I’ve worn every brand of shoe on the planet and never found a shoe that did NOT find a vulnerable spot on my foot to rub raw. Even my beloved white Jack Purcell sneakers. With that said - I don’t like socks. I’ve bought a TON of them in 35+ years.....all major brands. They shift. They lose their shape. They get holes in them and wear out too fast. Not these. I retired this year, and knowing I’d be in sneakers a lot, traveling, sightseeing ...... I bought these 6 months ago and have worn them constantly. I’ve traveled with them. I’ve washed them in hot water and bleach. The socks are like brand new. They are exactly the right cut so as not to be seen in a basic sneaker. The little silicone patch on the heel stays put. Not once have I had to dig down into my shoe and pull the sock back up. The socks have stayed soft and EXACTLY the same as the day they were new. Like I said - I am back to buy them again. Great quality!
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Reviewed in the United States on January 20, 2021
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Judy Fletcher
Draper, US
★★★★★ 5
No slip low socks
Number of Items: 3, Color: Black/White (3-pairs), Size: Medium
Perfect! ❤️ these!
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Reviewed in the United States on February 16, 2026
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Susan
Grantham, US
★★★★★ 4
Stay put!
Number of Items: 3, Color: White/Neutral (3-pairs), Size: Medium
Nice and thin, soft, and stay put. I wear an 8 shoe and don’t like a thick sock taking up room. These socks are a bit tight on big toe. Wish they came in large.
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Reviewed in the United States on October 10, 2023
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Stephanie Robnett
Birmingham, US
★★★★★ 5
The best
Number of Items: 3, Color: White/Neutral (3-pairs), Size: Medium
The best no show socks I have found. Stay in place very well and hold up wash after wash. I have tossed all the other brands I’ve bought over the years and stocked up on these as I was tired of digging through the drawer hoping to find a clean pair.
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Reviewed in the United States on December 8, 2024

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