Because Gravity have specced 4mm bolts throughout, fitting the Grid stem is a one-tool affair. The large bolts hold the faceplate securely in place and it feels nice and stiff on the trail. The upper bar clamp bolts have to be done up all the way first, which takes the guesswork out of clamping the bar evenly and makes it easier to adjust bar roll. There’s a 35mm length option too. With the bolts tightened to the recommended 6Nm, it was just possible to twist the stem on the steerer in our static test. Its 168g weight is mid-pack rather than class-leading. Price $105