The Rennen Ultralite Stem is an engineering masterpiece. Rennen set forth to develop the lightest mini stem in the world, but they didn’t stop there and made the stem adjustable. The adjustable feature is a interchangeable insert that allows for the stem to grow as your rider grows. Specs: 25mm option weighs a mere 40g making it the lightest mini stem in the world. The Rennen Ultralite Stem is availble in three sizes; 25mm, 27.5mm, 30mm. Additional inserts can be purchased seperately. The stem is made from 7075-T6 Aluminum and it is coupled with custom made 4mm 6AL-4V titanium screws. The custom 6AL-4V titanium screws feature a unique ball socket interface to ensure proper clamping at any angle. 80 lb Weight Limit - Due to the extreme weight reduction design we recommend that this product not be used for a child weighing greater than 80 lb.
