Since you've measured your stem at 22.2mm and since you perceive the same wiggle with two stems, that rules out an undersized stem. That gives you two choices:
-live with it. It's one of the minor shortcomings of quill stem bikes, made more noticeable with a really tall stem and presumably wide bars. -OR- -pursue the notion that your steer tube inside diameter is larger than it ought to be. If you wanted to pursue the notion that your fork is "out of spec", try inserting one of your test-stems into another 1" fork steer tube and convince yourself that it does not wiggle. Then you will have proven there is an objective shortcoming on your fork. Talk that over with Rivendell and try to make it right. In general, every quill stem, when slid into the steer tube has a small amount of 'wiggle'. That small amount of wiggle is reduced but not eliminated by tightening the bolt that engages the wedge. That wedge-spot is down at some depth, and the stem can still pivot around that point a tiny bit. That is the way it is, to some extent. In the case of a steer tube whose ID is larger, that wiggle will be larger. I don't know if Rivendell has a spec that they guarantee, nor do I know if there's some universally accepted tolerance there. My instinct is that the steer tube ID has to be larger than 22.2mm, and I'd say it probably also has to be larger than 22.225mm (which is the real value of 7/8"). To me, 22.3mm seems reasonable. To me, 22.5mm would seem unreasonable. Where to draw the line...22.4mm? I don't know. For the sake of science I just tried to wiggle the stem on two of my bikes that have a 1" quill stem. On neither do I consider it a problem. On one bike (Bridgestone RB-1), I could see the gap around the stem at the locknut open and close ever so slightly. On the other I saw no change. What I see in your video seems like "more wiggle" than either of my test bikes. Take that for what it's worth. Maybe have a mechanic you trust give it a look. Tell them "I think this is bad, what do you think? If they say "yeah I agree it's bad" then pursue something. If they say "no this looks normal" then maybe live with it. At any rate, if the wiggle makes you unhappy, talk with Riv and find a way to be happy. I'm sure they'll work with you to get you there. Bill Lindsay El Cerrito, CA On Wednesday, September 6, 2023 at 2:57:20 PM UTC-7 rmro...@gmail.com wrote: > Regarding item #1, stem measures 22.2 & of course it is a 1” steer tube. > Seemed unliked Riv would sell a stem for one of their bikes that was the > wrong size, but worth checking for sure. > Regarding item #2, I did remove & replace stem & it did not change. > I remember reading that the minimum insertion point should be at or below > the top of the head tube, not the top of the locking nut. Mine is 2cm below > the top of the lock nut, so pretty close to the top of the head tube. Will > told me the minimum insertion line could be at the top of the lock nut. I > could drop it a few cm to see if the movement gets better, but then it > would be too low for my comfort. > > Sent from my iPhone > > On Sep 6, 2023, at 3:28 PM, Ted W <ted.l...@gmail.com> wrote: > > > > Couple of thoughts right off: > > 1. if you pull the stem out to the minimum insertion line and re-tighten > it, does it still move? Sometimes, if you've inserted the stem too far, you > may encounter this issue. It can be mitigated by getting a shorter stem or > cutting the current one down a bit (advanced mode). > 2. What's the inner diameter of the steerer and what's the outer diameter > of the stem? There are different threaded headset standards. I've provided > a summary below. It's possible you've wound up with a mistmatch: > > *Stem “neck” outer diameter* – measurement units: mm (inches) *Standard > name* > *21.15 (13/16″)* Old American and BMX standard > *22* Old French standard > *22.2 (7/8″)* Standard for most threaded forks with an outer diameter of > 25.4 mm (1″) > *25.4 (1″)* Standard for most threaded forks with an outer diameter of > 28.6 mm (1 1/8″) – not very common > > On Wed, Sep 6, 2023 at 3:07 PM Richard Rose <rmro...@gmail.com> wrote: > >> Greetings folks. I would appreciate any input regarding this. Since new I >> have had some movement in my headset / stem that concerns me, possibly >> unnecessarily so? Please review the attached video link and tell me what >> you see. I felt the headset was a bit loose so tightened it a bit. This >> made no difference. The minimum insertion line for the Faceplater stem is a >> full two centimeters below the headset lock nut. So, the question seems to >> be is this stem quill movement excessive & if so how to eliminate it. I do >> mind the inherent flex. It no doubt contributes to the comfort of the bike? >> I just want to be certain it is safe and causing no harm. >> I appreciate your help. >> Richard >> https://photos.app.goo.gl/ZXVZBrQEVzamDV1H6 >> >> -- >> You received this message because you are subscribed to the Google Groups >> "RBW Owners Bunch" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to rbw-owners-bun...@googlegroups.com. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/rbw-owners-bunch/c6a07a11-796c-4686-acdd-e3212ff0f766n%40googlegroups.com >> >> <https://groups.google.com/d/msgid/rbw-owners-bunch/c6a07a11-796c-4686-acdd-e3212ff0f766n%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> > > > -- > Ted Wood < ted.l...@gmail.com > > > -- > You received this message because you are subscribed to the Google Groups > "RBW Owners Bunch" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to rbw-owners-bun...@googlegroups.com. > > To view this discussion on the web visit > https://groups.google.com/d/msgid/rbw-owners-bunch/CANCvShrk7oDZokhz1qx3K1WQQnJ5WWhPnMShRRzCmc25LefKsw%40mail.gmail.com > > <https://groups.google.com/d/msgid/rbw-owners-bunch/CANCvShrk7oDZokhz1qx3K1WQQnJ5WWhPnMShRRzCmc25LefKsw%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > > -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/rbw-owners-bunch/3d2bc275-e8c8-4e10-8434-be24b750bbf1n%40googlegroups.com.
