We tested these out for an entire season to make sure they were solid and would not cause handlebars to slip. If you want to keep the handlebar stem that you already have but run MX handlebars for increased strength and a rise taller than 3" MTB bars this is your answer.
Includes 2 pairs of shims used to convert your 31.8 diameter stem to 28.6 for using MX bars with your Surron.