The system ex ahead 318mm stem is the ideal addition to any rider who is looking for a cheap and reliable replacement for their current stem with a solid build design the ahead stem is ideal for heavy riders with a super secure four bolt clamp the systemex stem ensures that your bar is not only held super securely but also helps reduce the chance of bending or snapping in the bar this stem fits 318 mm bars ensuring that it is suitable for most standard riding styles excellent strength