BMX stems are 22.2mm
MTB stems are 25.4mm
you can shim bmx bars to fit into a MTB stem but you can shim a smaller opening to fit a larger bar just doesnt work that way.
Profile also list their stem as the lightest front mout 6 bolt stem on the market @ 9.0oz or 255 grams ( With Titanium bolts )
The Nemesis Stem weigh's in at 9.9120 or 281grams ( weighed by Sicklines.com) and fit's either MTB bars or BMX size bars . Sicklines review of Nem-Pro street stem
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