It fit perfectly on my mountain bike's new handlebars. I've read a few reviews about fitment but found it to slide in without any issues. I did keep in mind the wedged design and pushed on the bolt rather than the end cap. ID is about 18.40mm (0.7245") which can be compressed a bit more. I got the plastic down to 0.65". If you go by the product description it may be a tight fit going down to 0.62".
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