You also have to take HT angle into account. Knowing your trig and given figures (frame and stem dimension) will get the most exact fitting.dcl10 said:Keep in mind that when you have any kind of angle on the stem, the effective length cannot be the same on both sides if one side is the accurate length. Some manufacturers (Pro for example) will assume your using the stem with a negative rise, and so make the stem accurate in that dimension, but short when your using positive rise. Others like 3T and Thomson will make the negative rise side longer, while the positive rise is accurate. So for instance my 120mm -17 3T ARX stem is actually 127mm when using negative rise.
Thank you - that's exactly what I am planning to do.Ventruck said:While I don't want to disrespect the OP that it's "just 5mm" from 130- or 140mm, I think it'd be ideal to work some math out with putting spacers in the equation before the stem hunt goes berserk.
If you're not so math-savy, then I'll cut to the chase saying that you should get the 140mm in worst-case scenario and work with a thin spacer. The extra length will account for more drop*, and hopefully an accompanying spacer underneath can offset that to something very close to having the drop/reach dimensions of 135mm stem.