Originally Posted by cyccommute

I think that people have been leading you astray. I doubt, highly, that a modern aluminum bike would have a 1" steer tube. Measure the diameter of the quill you have now. If it is a 1" it will measure 22.2 mm. If it is a 1 1/8" it will measure 25.4mm. I'll leave it up to the reader to do the conversion. If you don't have a caliper to measure with, you can use a quarter. 25.4mm...oh, alright, it's an inch...is just wider than a quarter. 22.2mm is significantly narrower.