Join Date: Dec 2006
Bikes: Homemade mixte, track, commuter and road, Ryffranck road
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From what I've seen online the quill is 0.065 or 0.058 (Ritchey, Salsa, Cinelli -wall divided by 3-, etc) so hopefully I'm in the ball park. For MTB stem thicker is probably better. Unfortunately the Paterek manual didn't specify the wall.
For the extension, people use 1x0.049 or 1-1/8x0.049 I think. 7/8x0.058 is close to the former in terms of stiffness. I figured since it was a short extension, that it will see laid back bars (that are way flexy).... Hopefully it's okay.
And most stems (aluminum, steel) use a single M6 binder. With a removable face plate and multiple binders I agree it would look big.