Review on ODIER Bike Headset Spacer Set – 6Pcs Aluminum Alloy Bicycle Stem Headset Spacers for 1 1/8-Inch Stem – Compatible with MTB & Road Bikes – 2mm, 3mm, 5mm, 10mm x 3 – Black by Bill Pool

Just what I need to replace stems on a Cannondale Quick 6 and Giant road bike. Before spacers were used, a carbon fork could not be tightened when installing a new stem. Thanks to the wide variety of spacer sizes, I was able to make up the difference and get the perfect result. They fit perfectly on a threadless rod (the diameter matched perfectly). If you're replacing a stem on a bike for a better fit, make sure you get some of these spacers as well. If I hadn't read the questions and reviews about this product, I would never have known this was happening. I was able to fix two bikes for a few dollars - not bad. Very happy with product, value and fast delivery with Revain Prime.