Precisely fitting reduction for inserting a 1-1/8“ stem into a 1-1/4” headset. Sleeve length 80 mm, Ø outer/inner 28.6 x 25.4 mm. (30 g/ TW). With these reducing sleeves, thinner stems can be fitted in oversize headsets. Caution: The stem must be inserted exactly to the length of the reducing sleeve, otherwise it will not clamp properly and the stem may twist while riding (risk of accident!).