Would you like to have your stem length changed by a professional mechanic? No problem! With the interchangeable T-Bar CP0018, stem lengths from 70 to 130 mm are available in precise 10 mm increments. PLEASE NOTE: - If you change from a 70-90 mm stem to a longer one (100-130 mm), you will need size L drops. - Conversely, if you change from a longer stem with 100-130 mm to a shorter one (70-90 mm), you will need size S drops. However, if you stay within the 70-90 mm or 100-130 mm size range, you can continue to use your existing drops. Stem length 70-90 mm: Drops in SMALL required. Stem length 100-130 mm: Drops in LARGE required. NATTENTION: This product is intended exclusively for installation by a trained bicycle mechanic, not for the end customer. Incorrect assembly of the complete bike, components, spare parts and accessories can lead to danger! Not interchangeable with CP0048. Danger to life! New brake lines must be installed from a stem extension of >10 mm!