26 or 31.8? This is OK for 31.8 http://www.wiggle.co.uk/bbb-bhs-25-highrise-oversize-stem/ But it is very high rise. A normal 73° stem already gives a lot of rise when you flip it over, e.g. 100mm×73° lifts the bars by 56mm when you flip it over, have a play at http://alex.phred.org/stemchart/Default.aspx to see what you need.
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26 or 31.8?
This is OK for 31.8 http://www.wiggle.co.uk/bbb-bhs-25-highrise-oversize-stem/
But it is very high rise. A normal 73° stem already gives a lot of rise when you flip it over, e.g. 100mm×73° lifts the bars by 56mm when you flip it over, have a play at http://alex.phred.org/stemchart/Default.aspx to see what you need.