Originally Posted by
fietsbob
shaft of the BHP 20 is 22.2mm 7/8" , keyed shims take it out to the same OD as the fork. 1"
use less , to bury the quill shaft deeper in the fork , add the 1" to 1.125" stem shim.. on the top..
the spacers under the stem would come out from those, a spacer ID of 1" , so you need to buy those in addition,
ie, those made for 1" threadless forks..
I used the BHP 21, on my threadless fork with a too short cut steerer..
http://www.cyclofiend.com/working/im...-5P1010010.jpg
the steerer spacers went over the BBB BHP 21, using all of their keyed spacers.. I still get to use the top cap adjustment..
(I get the aero headwind posture on that bike's Trekking bars)
....
Thanks fietsbob. I understand the first part of your explanation. I didn't realize these were "keyed shims", not plain spacers. So, remove or add keyed shims as needed to get the desired depth of the BHP 20 in the steerer tube. I'm foggy on the second step. You say, "add the 1" to 1.25" (25.4mm to 28.6mm) on top". If I look at the photo below of the BHP 20/21, there doesn't appear to be a 1" to 1.25" shim like you describe. All shims appear to have the same diameter. It's spec'd at going from 22.2mm to 25.4mm, not 28.6mm.
So, I'm assuming that you mean I'd have to buy a shim to take the 1" up to 1.25" separately? And to install that top shim, I'd necessarily have to remove enough of original shims to fit the 1" to 1.25" final, topmost shim. Does the 1" shim have a key slot for the 1.25" shim to slide into with its key? What would be the length of the 1.25" shim?
And do I get this correctly? I.e. that the finishing spacers with 1" ID would slip underneath the 1.25" shim, the end result being that there would be only one diameter (1.25") of tubing top to bottom, not two like would happen with a regular threaded to threadless quill stem extender (7/8" out of the steerer tube then 1.125" top section where stem attaches).
Thanks for the photo, fietsbob. Your stem setup looks fine, and pretty much what I'd want to achieve, and your trekking bar is about the same height I'd need.
Sorry to pester you with what may seem easy and obvious to you. That 1" to 1.25" shim has got me puzzled. I'm hoping that I'm just missing something really obvious, obvious enough to need to respond with "Doh!"