I decided to replace the 26.8 seat post that came with my Roadini; I discovered that 'Promax' makes a nice and light and high quality seatpost in 26.8 (it is 'SP-1' model and it comes in Red, Blue, Gold and Black (no silver). It has served very nicely. I also had trouble with both of my 26.8 seat posts slipping down over time with the Roadini frame. I ended up using some carbon paste to solve that problem. You can also have a machinist or frame builder put a nice grid pattern into the surface of the seatpost to keep it in place (Chris Kelly in Nevada City, Ca. has done that for me with other frames). At any rate, the Promax seat post is the one to get in my opinion, and although it is kind of long, it only weighs about 9 ounces (and, of course, it can easily be cut down). Cheers, Karl Weimar, CA.
On Tue, Oct 19, 2021 at 10:37 AM lconley <lcon...@brph.com> wrote: > Probably voided the warranty, but the Bombadil would have been useless to > me without the setback seatpost, I have a very long torso. It was on sale > for $1800 brand new (normally $3000 back then) from Rivendell and was the > correct 52cm for my legs, so I was going to make it work. Rivendell > recommended a Hunqapillar for a touring bike for me, but Bombadil on sale > was less expensive. i really didn't have to hone that much, the seatpost is > a little less than 27.2 and the bike was a little more than 27.0, so the > tube thickness removed was less than 1.0 mm. > > Laing > > On Tuesday, October 19, 2021 at 12:24:06 PM UTC-4 Hugh Smitham wrote: > >> I agree the lugs used (no matter the design) accept the same OS diameter >> tubing but Rivendell went with thicker walled tubing. The question is why? >> To me Grant not wanting to ream out the seat tube could effectively be >> solved by choosing a thinner walled tubing. I think it's a structural >> decision as I mentioned before. Laing, I wonder if by reaming out the >> inside of the seat tube you are voiding the warranty? Probably NBD unless >> you ride like Manny and need all the extra gussets and tube wall thickness. >> >> David, basically my issue boils down to lack of availability which >> obviously has been exacerbated by the pandemics supply chain disruption. >> Yet still if I want a 27.2 post NBD. >> >> Eric and Laing, I agree with a lugged post in 26.8mm please! >> >> ~Hugh >> >> “Life is like riding a bicycle. To keep your balance, you must keep >> moving.” ― Albert Einstein >> >> >> >> >> >> >> On Tue, Oct 19, 2021 at 8:45 AM Toshi Takeuchi <tto...@gmail.com> wrote: >> >>> Laing, your point is exactly my point. If you use the same lugs you do >>> not change the OD otherwise the lugs would not work. If you want to use >>> the same lugs and want a thicker tube, then it must get thicker on the >>> inside, so the inner diameter must decrease with a thicker tube. That's my >>> understanding of why the seat post is now smaller in diameter. >>> >>> Toshi >>> >>> >>> On Tue, Oct 19, 2021 at 7:54 AM lconley <lco...@brph.com> wrote: >>> >>>> Lugs attach to the OD of the tube and have nothing to do with the ID of >>>> the tube. My second Sam Hillborne, in orange metalflake, had the same lugs >>>> as my 1st, but used the 26.8 seatpost. >>>> Gotta go - the UPS guy is at the door with my Crust Clydesdale fork. I >>>> am going to call this latest creation Conley's Crustendell Clementine >>>> Clydesdale Cargo Cycle (but sadly awaiting the Cliffhanger rims till >>>> December). I love a good alliteration. The black fork even matches the >>>> black Clementine. >>>> >>>> Laing Conley >>>> Delray Beach FL >>>> >>>> On Tuesday, October 19, 2021 at 10:37:40 AM UTC-4 cycli...@gmail.com >>>> wrote: >>>> >>>>> Hi Hugh, I had my little rant about this same issue back on Nov 24th >>>>> last year. I assumed the change on the Hillbornes was made when they >>>>> changed the style of the seat lug. The ends of the seat stays on my 2015 >>>>> Hillborne (sidepull brakes) where they meet the seat lug are of a >>>>> different >>>>> style than the current models. I assumed that was the reason, but I >>>>> notice >>>>> the Platypus and the Appaloosa use the same style as my Hillborne, but >>>>> both >>>>> those frame take 26.8mm seatposts. Seems odd that the wall thickness used >>>>> in the seat tube of the Hillborne would change after 2015, but I guess it >>>>> did, hence the change to 26.8mm seatposts. Anyhow, I'm with you on this. >>>>> Definitely limits ones options. >>>>> >>>>> On Tuesday, October 19, 2021 at 6:43:25 AM UTC-7 eric...@gmail.com >>>>> wrote: >>>>> >>>>>> I asked Will about this recently and he said something to the effect >>>>>> that Grant didn't want to ream out as much from the seat tube hence >>>>>> thicker >>>>>> tube and thinner post. >>>>>> >>>>>> I'm with Laing and would like that lugged seatpost in a 26.8, please! >>>>>> >>>>>> On Tuesday, October 19, 2021 at 8:05:10 AM UTC-4 lconley wrote: >>>>>> >>>>>>> Rivendell switched over to mostly 26.8 seatposts maybe 5-6 years ago >>>>>>> when they started using thicker tubing across the board. My 1st >>>>>>> Rivendell >>>>>>> (of 13) was a sidepull double top tube all-blue Sam Hillborne in 2011 >>>>>>> and >>>>>>> was 27.2, every other Rivendell with a 28.6 (1-1/8) OD seat tube since >>>>>>> has >>>>>>> been 26.8 except the thin tubed Frank Jones Sr with a 27.2 and the >>>>>>> Bombadil >>>>>>> with a 27.0. I just wish that they would issue the lugged seatpost in >>>>>>> 26.8. >>>>>>> I put a 27.2 lugged seatpost in the Bombadil by honing the ID if the >>>>>>> seat >>>>>>> tube with an automotive brake cylinder hone. I use the hone on all my >>>>>>> frames anyway to smooth the interior of the tube so that the frames >>>>>>> don't >>>>>>> scratch the seatposts. In the case of the Bombadil It just took a >>>>>>> couple of >>>>>>> evenings and an extra set of stones to enlarge the diameter. The >>>>>>> Hubbuhubbuh and Clementine use even larger seat tubes and seat posts. My >>>>>>> custom uses 31.8 OD tubes for the entire main triangle and uses a 29.0 >>>>>>> seatpost (1.4mm thick seat tube) - made for an interesting search - >>>>>>> ended >>>>>>> up with an very cool 30 year old NOS Campagnolo Icarus MTB seatpost. I >>>>>>> grew >>>>>>> up on French bicycles, so alternate component standards were always >>>>>>> part of >>>>>>> cycling to me. Much more pleasurable using Google than telephoning >>>>>>> multiple >>>>>>> bike shops and hitch-hiking across the state in the seventies to get a >>>>>>> 26.4 >>>>>>> Campagnolo Record seatpost. >>>>>>> >>>>>>> Laing >>>>>>> Delray Beach FL >>>>>>> >>>>>>> On Tuesday, October 19, 2021 at 5:57:29 AM UTC-4 Nick Payne wrote: >>>>>>> >>>>>>>> On Tuesday, 19 October 2021 at 7:37:04 pm UTC+11 Nick Payne wrote: >>>>>>>> >>>>>>>>> If you use a seattube with thicker 0.9mm walls (say for a touring >>>>>>>>> bike designed to carry a load), then that will take a 28.6mm seatpost. >>>>>>>>> >>>>>>>> That should have been 26.8mm seatpost, not 28.6. >>>>>>>> >>>>>>> -- >>>> 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/232661c3-d738-4bdc-ac36-393921046a76n%40googlegroups.com >>>> <https://groups.google.com/d/msgid/rbw-owners-bunch/232661c3-d738-4bdc-ac36-393921046a76n%40googlegroups.com?utm_medium=email&utm_source=footer> >>>> . >>>> >>> -- >>> >> You received this message because you are subscribed to a topic in the >>> Google Groups "RBW Owners Bunch" group. >>> To unsubscribe from this topic, visit >>> https://groups.google.com/d/topic/rbw-owners-bunch/PJBZce5BzpY/unsubscribe >>> . >>> To unsubscribe from this group and all its topics, 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/CAGB59xz4nnK7ROH%3DehmQFj1wXcddnCY5C1jV4NP2YQXuzTmNGg%40mail.gmail.com >>> <https://groups.google.com/d/msgid/rbw-owners-bunch/CAGB59xz4nnK7ROH%3DehmQFj1wXcddnCY5C1jV4NP2YQXuzTmNGg%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/2c41341e-5585-4a1a-9da1-38bac5c33bf8n%40googlegroups.com > <https://groups.google.com/d/msgid/rbw-owners-bunch/2c41341e-5585-4a1a-9da1-38bac5c33bf8n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. 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