This stem cap is where your bike fashion sense and the weight weenie in you collide... light, sexy and with a Wolf on it. This Ultralight and ultra-sleek stem cap integrates a 5mm, 10mm or 15mm headset spacer with your stem cap in finely machined piece. Why have extra steer tube requiring spacers on top of your stem you ask? Well, many carbon steerers require that the steer tube extend above the stem. Also, riders may want the flexibility to move handlebar height up and down for different types of riding or for bike re-sale. Compatibility: 1 1/8" top (straight 1 1/8" or 1 1/2" to 1 1/8" taper) steer tubes only Complementing products: Check out our other Wolf Tooth Small components and Merchandise. Tech Specs: Design and manufactured in Minneapolis, MN USA 1 1/8" top (straight 1 1/8" or 1 1/2" to 1 1/8" taper) steer tubes only 6061-T6 Aluminum 5mm, 10mm, and 15mm internal cylinder wall heights Black aluminum bolt included Colors - red, black, orange, gold, blue, green, purple, silver Total weight (cap + bolt): 5mm= 12g, 10mm= 14g, 15mm=16g. Compare to a standard flat stem cap and steel bolt at 20 grams + spacers add even more.