Highest g-force on a roller coaster

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The highest g-force which can be experienced on a roller coaster today is 5.5 g on Shock Wave at Six Flags Over Texas in Arlington, Texas.

Record table

Rank	G-Force	Name	Park	Location	Manufacturer	Record Held
1st	5.5 g	Shock Wave	Six Flags Over Texas	Arlington, Texas, USA	Schwarzkopf	1978 – September 2001, 2007 - Present
2nd	5.2 g	Boomerang (Vekoma product)	Various parks	N/A	Vekoma	N/A
		Olympia Looping	N/A	N/A	Schwarzkopf	N/A
4th	5 g	Diving Machine G5	Janfusun Fancyworld	Koo-Kung Hsiang, Yunelin, Taiwan	Bolliger & Mabillard	N/A
		Invertigo	Various parks	N/A	Vekoma	N/A
		Rock 'n' Roller Coaster Starring Aerosmith (Disney's Hollywood Studios)	Disney's Hollywood Studios	Lake Buena Vista, Florida, USA	Vekoma	N/A
		Suspended Looping Coaster	Suzhou Amusement Land	Suzhou, Jiangsu, China	Vekoma	N/A
		Typhoon	Bobbejaanland	Lichtaart, Antwerp, Belgium	Gerstlauer	N/A
		Vortex	Siam Park City	Bangkok, Bangkok, Thailand	Vekoma	N/A
		X Coaster	Magic Springs & Crystal Falls	Hot Springs, Arkansas, USA	Maurer AG	N/A
		Xpress: Platform 13	Walibi Holland	Biddinghuizen, Flevoland, Netherlands	Vekoma	N/A
		Avengers Assemble: Flight Force	Walt Disney Studios Park	Marne la Vallée, Île-de-France, France	Vekoma	N/A

Notes

Moonsault Scramble exerted a maximum g-force of 6.5 g on its riders. It operated from 1983 to 2000. Many other defunct roller coasters would appear on this list, however their maximum g-force was never measured or calculated.

Tower of Terror exerted a maximum g-force of 6.3 g on its riders before being refurbished in 2006 - 2007. According to the project manager of the 2006 - 2007 refurbishment, the ride now has "drastically lower levels, now reaching close to 4G in the tunnel".