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Stem sizes??????

Being completely untechnical, apparently the stem on my bike is 130mm. Bike fitting yesterday showed I needed a shorter one (100mm). Looking at Wiggle, they advertise Oversize stems. What does this mean? And will it fit my bike? The size shows it as 31.7 but what measurement is this?


  • agent_tiagent_ti Posts: 306
    The 31.7 is the diameter of the handlebar that the stem takes, most modern bikes are this size now and it is referred to as oversize. The normal one is 27.9 (i think, might be wrong!)
  • TTX PROTTX PRO Posts: 225
    31.8mm for oversize and 25.4mm for normal
  • Thanks, makes sense now..... and it is oversized that I need
  • sfullersfuller Posts: 628
    if you are looking for a decent cheap stem I bought this for my bike.

    Ritchey Stem
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