SKU: 30773546199

Piston Set by JE - 86.5mm +.50mm Oversize Bore | 9.0:1 CR | Stock Stroke - 85.8mm - S50 BMW M3

Sale price$520.20 Regular price$578.00
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Ships within 48 hours · Estimated delivery Aug 9 - Aug 14

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Description

Piston Set by JE - 86.5mm +.50mm Oversize Bore | 9.0:1 CR | Stock Stroke - 85.8mm - S50 BMW M3NOTE: Image shown not actual parts. JE Pistons is the leader in forged racing pistons. With 70 plus years of experience, in house forging, and industry leading technology, JE Pistons are designed to perform at the top levels of all forms of motorsports. Bore (in) 3. 406 Bore (mm) 86. 5 Top Compression Ring Thickness 0. 0400 Second Compression Ring Thickness 0. 0480 Oil Ring Thickness 0. 111 Forging Type FSR Volume (cc) 24. 20 Series JE Pistons Piston

NOTE: Image shown not actual parts.


JE Pistons is the leader in forged racing pistons. With 70-plus years of experience, in-house forging, and industry-leading technology, JE Pistons are designed to perform at the top levels of all forms of motorsports.


Bore (in) 3.406
Bore (mm) 86.5
Top Compression Ring Thickness 0.0400
Second Compression Ring Thickness 0.0480
Oil Ring Thickness 0.111
Forging Type FSR
Volume (cc) -24.20
Series JE Pistons
Piston Head Type Inv Dome/Dish
Pin Diameter (IN) 0.866
Compression Height 1.291
Make BMW
Wrist Pin Style - floating or press fit Floating
Wall Type CHAMFERED
Wall Thickness (IN) 0.150
Ringset Part Number JG1001-3405
Ring Brand ProSeal
Ringset Included Yes
Retainer Thickness 0.063
Retainer Lock Style Wire Lock
Retainer Lock Part Number 866-063-MW
Retainer Diameter (IN) 0.866
Replacement Single Piston 297180S
Replaced By 288917
Piston Pin Inside Diameter 0.566
Piston Pin Material 5115 LOW CARBON STEEL, CASE HARDENED
Piston Material 2618
Piston Pin Length (IN) 2.250
Piston Avg Wt 301
Pin Offset Yes
Pin Brand JE Pistons
Pin Part Number 866-2250-15-51C
Pin Included Yes
Pin Diameter (mm) 22.00
Oil Rail Support Included No
Deck Clearance 0.030
Brand JE Pistons


OE Part #: 11-25-1-404-961 / 11 25 1 404 961 / 11251404961

Shipping Notes
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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
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SKU: 30773546199

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★★★★★ 5
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It fits perfectly, just what I expected, good quality and it does the job
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Reviewed in the United States on February 9, 2026
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AikenSCGuy
Lexington, US
★★★★★ 5
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This is a great product. I bought a car that had the base installed so I bought one to be able to use it. Holds great!
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Reviewed in the United States on August 2, 2025
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xiTzMoEx
West Palm Beach, US
★★★★★ 1
Use locktight red or blue
Product comes loose frequently and its extremely annoying to tighten it takes forever
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Reviewed in the United States on November 4, 2025
M
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MrRich
Massapequa, US
★★★★★ 2
Metal tab blocks magnetic charging
The set screws are too small and they do not have an adapter that fits the magnet charging rings on the newer phones
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Reviewed in the United States on October 4, 2025
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J&A
Carnegie, US
★★★★★ 5
My favorite BMW car mount.
This is my favorite mount for BMWs. I have them on two cars (X4M and a 328), but I always modify the mount and install a metal ball (purchased here on Amazon) so I can mount an ESR Wireless charger. This combo is the best charging mount and system I have ever tried
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Reviewed in the United States on November 17, 2023

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