I have been suspecting the tiniest bit of slippage on my Clem H, but I have been playing with position and saddles so it has been hard to tell. I marked the seat post with a sharpie the other day to find out once and for all. I also cranked the bolt down pretty tight, so hopefully that helps.
I had the level of slippage that you are describing on a Rawland with a Thompson seat post. A well respected bike mechanic told me to regrease the seat post and rub some dirt in it. Lo and behold, it worked! While I am sure some people are whingeing, it seemed so much more ingenious tome me than the coke can method. If there is slippage on my Clem, it will get the dirt! Good luck, Joe in SF On Monday, November 22, 2021 at 11:19:42 AM UTC-8 Patrick Moore wrote: > Good luck! I've experienced seatpost slippage enough that I know the > discouragement that accompanies it. > > Aside, anecdote, non-essential, FWIW, ignore safely: The last time my post > slipped was on the inaugural ride of the Monocog 29er (late Oct 2020, in > fact) that I'd traded onlist for an unsellable frameset. I was 3 miles in > and things were not going well: the riding position, the tires, the Q, the > grossly overwide bar -- all was just wrong, wrong, wrong. Add to that that > it was a raw, cold day (late 2020) and the trails were half-frozen ruts > mixed with just-thawed mud. And I was out of shape, and it was a grey, raw, > humid, cold winter day. > > So when about the 3-mile point I realized that I was now 1/2 to 1" lower > than before, the sordid unpleasantness of the situation dug itself further > into my brain. I stopped and raised the post, rode, slipped, stopped etc > again; finally made it back home thinking, "This trade was a huge failure." > > I solved the slippage with a beefier clamp, and as you've heard, after > much tweaking the Monocog is now a beloved part of my 4 1/2-bike stable, > and only needs a new frame and new wheelset to make it perfect. (Rear > triangle to accommodate true 76 mm/3" tires with air, and new wheels to > accommodate the 3" WTB Rangers without either tubes or the anxieties of > "ghetto" tubeless tire installation *AND* that let the Rangers expand > 5-10 mm more to their true potential; the OEM wheels are made of Alex 24 mm > outside rims not designed for tubeless tires.) > > On Mon, Nov 22, 2021 at 11:43 AM Ben Mihovk <bjmi...@gmail.com> wrote: > >> Thanks for the thoughts, Patrick. After talking with Will today, I'm >> going the knurled seat post route through Rivendell. >> >> Ben >> On Monday, November 22, 2021 at 11:46:23 AM UTC-6 Patrick Moore wrote: >> >>> I've had seatposts slip and fixed them in 4 ways: >>> >>> 1. Clamps with integrated bolt: Lots of blue Loctite, tho' I think there >>> may be a (green?) version meant just for this. >>> >>> Fiber gel meant for CF seatposts also seemed to work, but I didn't rely >>> on that as long as I did the blue Loctite. Blue L did work, but use it >>> liberally. >>> >>> 2. Separate clamps: Buy a stouter one and tighten it harder. This worked >>> with my Chauncey Curtrivroadclone with elegant, delicate, relieved external >>> clamp that would not tighten down hard enough -- in fact I cracked it, then >>> bought a beefy one and that has worked fine. >>> >>> 3. Shim. Beer can (soda cans are not worthy of Rivendells) metal did >>> work, but this is cheesy. >>> >>> 4. Get a new seatpost (see immediately below). My ultra-expensive and >>> ultra-light and ultra-elegant Syncro ti seatpost kept slipping, about 1/2" >>> per mile, on one of my road bikes, and after playing with shims and Loctite >>> I replaced it with an American Classic in aluminum that fit fine. Both 27.2 >>> mm. >>> >>> While seatpost and seattube combinations have the infinite variety of >>> personality types and sand grains on the beach, this problem does come up >>> often enough on this list that I'd think Riv would want to add the matter >>> to their FAQ page. >>> >>> On Mon, Nov 22, 2021 at 7:33 AM Ben Mihovk <bjmi...@gmail.com> wrote: >>> >>>> I'm having the same issue on two bikes, a 2019 Atlantis with 26.8mm >>>> tube and a 2013 Sam with 27.2mm. Kalloy posts on both bikes. I reset my SH >>>> last night, marked it with a sharpie, and the sharpie mark was buried in >>>> the seat post after a my 3 mile ride. Now...I'm 210 pounds so I get that >>>> I'm going to stress that connection more than most folks. But...I unweight >>>> the saddle on rough spots and bumps and try to keep a lot of weight on the >>>> pedals.With my saddle on the bikes, if I loosen the bolt, the post sinks >>>> in. This is getting a little annoying...I popped the head off a bolt on >>>> the >>>> Sam Saturday and it scared the crap out of me (even though I knew it >>>> *could* happen). >>>> >>>> Is there anyone willing to swear by a particular friction grease to >>>> solve this issue? >>>> >>>> Ben, slipping in Omaha. >>>> >>>> >>>> >>>> >>>> >>>> On Thursday, September 9, 2021 at 2:40:07 PM UTC-5 ack...@gmail.com >>>> wrote: >>>> >>>>> Anybody else have issues with their seat post slipping on their Clem H >>>>> or any other Rivs? This is driving me crazy. I am infatuated with this >>>>> bike. Favorite ride of all time. I have a perfect 30 mile SF-Marin >>>>> Headlands-SF loop that keeps me sane. What is driving me insane >>>>> however >>>>> is that my seat post slips down about 1-1.5 inches every time I ride this >>>>> ride, which involves quite a lot of fire trail. I have cleaned the >>>>> inside >>>>> of the seat tube, I have applied friction grease, I changed the seat bolt >>>>> and greased and regressed it. I have heard that maybe a Coke can might >>>>> work as a shim, but I'd rather resolve the issue without hodging and >>>>> podging. Any thoughts? Advice? Commiseration? Thanks all. I've >>>>> ridden >>>>> on a Kalloy and a Thomson seat post, and it doesn't matter which seat >>>>> post >>>>> I use, there is slippage. >>>>> Alex >>>>> >>>> -- >>>> >>> 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/acfb0779-766e-460c-8ab4-cfd1ce2fe81dn%40googlegroups.com >>>> >>>> <https://groups.google.com/d/msgid/rbw-owners-bunch/acfb0779-766e-460c-8ab4-cfd1ce2fe81dn%40googlegroups.com?utm_medium=email&utm_source=footer> >>>> . >>>> >>> >>> >>> -- >>> >>> ----------------------------------------------------------------------- >>> Patrick Moore >>> Alburquerque, Nuevo Mexico, Etats Unis d'Amerique, Orbis Terrarum >>> >>> -- >> 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/43d5a4e2-9780-4371-8003-3039933f82b8n%40googlegroups.com >> >> <https://groups.google.com/d/msgid/rbw-owners-bunch/43d5a4e2-9780-4371-8003-3039933f82b8n%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> > > > -- > > ----------------------------------------------------------------------- > Patrick Moore > Alburquerque, Nuevo Mexico, Etats Unis d'Amerique, Orbis Terrarum > > -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. 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