Speedline Parts | Speedline Carbon MATRIX BMX Pro Racing StemThe Speedline Carbon Matrix Pro Stem is the first of it's kind. A complete carbon fiber pro size BMX Race stem sporting a 31. 8mm Clamping area Its designed to pair seamlessly with your Pro Carbon Handlebars & Pro BLK Carbon Race Forks The carbon on carbon clamping area creates a more efficient bond leading to less slippage of your carbon bars while simultaneously protecting your carbon components. Available in 48mm 54mm 60mm Still cant decide on the