Ergotec Stem Octopus XL (Ahead 50, 28.6/31.8, 50/115mm | Black Sandblasted)OVERVIEW The ergotec Octopus Ahead 50 XL stem is very stable, angle adjustment, 3D forged aluminium ahead stem with 4 screw handlebar clamping, adjustable rise and 31. 8 mm clamping diameter. Proven High Quality though Extreme Strength Tests. In ergotec Test Center, all ergotec handlebars, stems and seat posts are subjected to extreme long term tests, both individually and in combination. In addition to testing in line with European standards, ergotec