Ergon's grips were developed to reduce pressure on your hands, namely your ulnar nerve which, in turn, helps to mitigate numbness from long stretches in the saddle. The GS3 grip is the ideal compromise between its lightweight GX race grips and its plusher GP series grips.
The GS grips are a medium size and shape between the GX and GP series. It falls right in-between. The "3" in the name refers to the length of the integral bar end. In this case, it's longer than the GS2 bar end and is ample enough to wrap all four fingers around it.
The wing shaped support is where many glove makers are stitching on extra padding these days, and it provides more support for your hand. You'll perceive less pressure on your palm because of the increased surface area, and the soft kraton rubber gives just enough and allows supreme grip, even with sweat soaked gloves. Textured rubber inserts have been placed on the top of the grips. Ergon uses a softer rubber compound here to help dissipate vibration and jolts on the trail.
The angle of the grip is important and worth the time to find the position that works best for you. The clamp is integral into the molded GFK Composite bar end and should be tightened to a maximum of 5 Nm in order to avoid handlebar damage once you find the right angle. Both the grip and the bar end are independently adjustable, and indexing marks make it easy to get the two grips to line up identically. Ergon has found that most people go with the small size. The smaller diameter is lighter, a bit stiffer, and easy to grab. Those with big hands and those who spend long, long days in the saddle might want to lean towards large.
Please note: when mounting Ergon grips with integrated bar ends to carbon fiber handlebars, it is necessary to confirm that the handlebars are both rated for use with bar ends and are able to accommodate 6-8 NM of clamping force. Most carbon bars are not designed for use with bar ends, which can result in structural failure if applied.
The Ergon GS3 Grip is available in two sizes — Small and Large and in the colors Black or White. The Small features a 92mm cross-section and the Large is 102mm. The set comes with bar plugs and installation instructions.