Hello good people

Background: I have a Time Edge frame with HTA = 72 degrees and 100mm length, 86 degrees (-4 degrees) down facing Newton 31-86 stem. I think I need a slightly longer stem, 110mm. Therefore, I am thinking of buying 110mm Newton 31-86 stem.

Can anyone tell me how this +10mm longer 110mm stem is going to change my bar height, if at all? I suspect it will raise the bar a tiny bit (since 86 > 72 degrees) but by how many mm, exactly, over 100m stem?

Related question: to save money I already have a longer (110mm) stem but it is -8 degrees, instead of my current 100mm stem of -4 degrees. If I swap -4 degree 100mm stem for -8 degree 110mm stem, on my 72 HTA what will the bar height change be (up, down and how many mm up or down)?

Many thanks in advance

Try here:

http://bikeforest.com/CAD/old/index.html

With your 72 deg ht angle

100mm/ -4deg 110mm/ -4deg 110mm / -8deg

reach 97mm 106.7mm 108.4mm

vert rise 24.2mm 26.6mm 18.7mm


These distances are horizontal and vertical distances from the centerpoint of the stem's clamp on the fork steerer tube. You can easily see the effects of the changes you are contemplating.

If you post your email I can send you a great little spreadsheet I created that will allow you to check it all very easily, including factoring in handlebar reach and drop and the effective top tube of your frame to see how things are affected by changing components and will give you a ready comparison of reach changes from a fixed point, namely a vertical line through the bottom bracket.

Geoff

With your 72 deg ht angle

100mm/ -4deg 110mm/ -4deg 110mm / -8deg

reach 97mm 106.7mm 108.4mm

vert rise 24.2mm 26.6mm 18.7mm


These distances are horizontal and vertical distances from the centerpoint of the stem's clamp on the fork steerer tube. You can easily see the effects of the changes you are contemplating.

If you post your email I can send you a great little spreadsheet I created that will allow you to check it all very easily, including factoring in handlebar reach and drop and the effective top tube of your frame to see how things are affected by changing components and will give you a ready comparison of reach changes from a fixed point, namely a vertical line through the bottom bracket.

Geoff

thanks. acidroadrider@hotmail.com

let me see if I understood your reply:

vert rise:
100/-4 110/-4 110/-8
24.2mm 26.6mm 18.7mm

Therefore going to 110mm in same -4 angle stem I get +2.2mm bar up and going to 110mm in -8 (sharper) angle I actually drop the bar down by -5.5 mm from my current bar height?

thanks

Here's my estimates, close to Bdaghisallo's:
110/-4: +2.4mm higher, +9.7mm longer reach
110/-8: -4.2mm lower, +10.9mm longer reach

Note. Assuming that all three stem steerer clamps have the same height.

Here's all you need to know:

http://www.habcycles.com/fitting.html