I'm late to the party here, but I can't believe there is a serious conversation about reaming out the seat tube enough to change seat post size.
Rivendell does not, as far as I know, divulge their steel specifications, except to state that they mix & match material thicknesses as needed by model and size. But no matter the details, butted tubes come in 0.9/0.6/0.9 mm wall thickness and similar, with 1.0/0.8 considered stout. Let's assume there's a reason for the "butting." It's really a "thinning" of the middle portion of the tube, as straight gauge tubing tends to be of the 1.0 mm variety all the way through. >From a quick internet search, it appears that seat tubes are generally single butted, with the thin part pointing up... meaning we're leaving 0.6 mm wall thickness at the seat post, assuming we started with 0.8 mm... Rivendell states they use air-hardened tubing, which can go as thin as 0.5 mm wall thickness. I'd have to hear it from a frame builder that they think it's OK. I don't believe it. cheers -mathias On Tuesday, October 17, 2023 at 8:17:01 PM UTC-4 Bill Lindsay wrote: > A few days ago Leah said: " Bill Lindsay - I would trust you to do it! And > I would drive to your part of Michigan if you had the tool to make it > happen! No pressure or anything. 😬" > > I spend one week every month in Michigan but I live in a hotel room. I do > not typically carry an adjustable seat tube reamer in my carry on luggage. > :) I also do not own an adjustable seat tube reamer, even though I am > plenty comfortable and experienced with its use*. If I needed that service > performed, I'd pay one of the local old timers, who I know have the tool > and know how to use it. > > *While I'm experienced with its use, I do not recall ever deliberately > reaming out a 26.8mm seat tube to 27.2. It's always been in the initial > frame prep step, or a repair step. I don't doubt that it can be done. I > just don't have a good feel for how long it should take. Like if it's a 2 > hour job, and a tradesperson quoted you $160 for two hours of (strenuous) > labor, would you want to do it? > > Bill Lindsay > El Cerrito, CA > On Sunday, October 15, 2023 at 5:02:54 AM UTC-7 Bicycle Belle Ding Ding! > wrote: > >> John, >> My seatpost actually has setback to 50. I have my saddle at 42 or 43. Now >> that I have these new grips, I could try the old seat post. The new grips >> sit further up the bars and I have more reach now. The feeling of being >> cramped was fairly slight, and I could often ignore it, but it was one of >> those little niggling details I wanted improved. Some people would have >> chopped their Billie Bars - not me! I need allllll that real estate so keep >> 1000 things on my bars! >> >> Eric, I know. I have had this exact thought. Bill Lindsay - I would trust >> you to do it! And I would drive to your part of Michigan if you had the >> tool to make it happen! No pressure or anything. 😬 >> >> Joseph! Oh why bother getting it in silver? Such a magnificent seat post >> deserves to be a focal point: I should just go with the black. 🙃 >> >> Joyce, there’s a woman in product design over at 1 Up, I see! I love my >> RivSisters; they don’t want me to miss out on any of the best stuff. >> >> Leah >> >> On Oct 14, 2023, at 4:48 PM, 'John Hawrylak, Woodstown NJ' via RBW Owners >> Bunch <rbw-owne...@googlegroups.com> wrote: >> >> A Nitto S84 has at least 10mm LESS setback than the IRD Wayback (approx >> 40mm (S84) vs 50mm (IRD) per RBW site). Leah pics shows the IRD to be >> full back. So even if she could use a 27.2 post, the S84 does not have >> the setback she needs. >> >> >> The real question is why didn't RBW design the frame for a 27.2mm seat >> post???? Are they using a straight gauge seat tube vs a butted seat tube >> to save cost??? Or do they need a thicker wall for the lug in the middle >> of the seat tube?? >> >> John Hawrylak >> Woodstown NJ >> >> >> On Saturday, October 14, 2023 at 7:28:07 AM UTC-4 ascpgh wrote: >> >>> The difficulty of less than common seat tube diameters was the indirect >>> subject of another lister's, touched upon a bit ago from a different >>> perspective: >>> https://groups.google.com/g/rbw-owners-bunch/c/ooTGF-OdSws/m/9T6WazuQAAAJ >>> >>> Every bike is different but if feasible on your Platy, it can be done to >>> permit something as nice as the Nitto S84 >>> <https://www.rivbike.com/products/nitto-lugged-seat-post-27-2-x-250-11048> >>> . >>> >>> Love Deb's "pre stock" grips for your Ergons. She's the best. >>> >>> Andy Cheatham >>> Pittsburgh >>> >>> >>> >>> >>> On Thursday, October 12, 2023 at 7:36:47 PM UTC-4 Bicycle Belle Ding >>> Ding! wrote: >>> >>>> I’ve had enough experiences with bike shops to be very hesitant to hand >>>> them my bike for a task that could ruin the frame. What happens if the >>>> hole >>>> is reamed too large? I can’t see that the frame would be salvageable. >>>> >>>> On Oct 12, 2023, at 9:10 AM, Johnny Alien <johnny....@gmail.com> wrote: >>>> >>>> Many here have said that its not a big deal to get a bike shop to ream >>>> it to 27.2 to allow for more seatpost options. I find it frustrating as >>>> well but slightly less so because I don't need the extra setback. >>>> >>>> >>>> >>>> On Thursday, October 12, 2023 at 7:39:10 AM UTC-4 brok...@gmail.com >>>> wrote: >>>> >>>>> Yeah, the whole 26.8 seat tube limitation has got to be one of the >>>>> most frustrating things about this era of Rivendell. >>>>> >>>>> On Oct 12, 2023, at 6:43 AM, Leah Peterson <jonasa...@gmail.com> >>>>> wrote: >>>>> >>>>> >>>>> >>>>> Ryan, >>>>> That seat post is butt ugly. The only ugly thing on the bike. I like >>>>> the setback it offers, and there are zero other options for that. Zero. >>>>> This bike is unimprovable, save this one thing: the seat tube should have >>>>> been 27.2 so I would have some OPTIONS. It’s my one sorrow. >>>>> Leah >>>>> >>>>> On Oct 11, 2023, at 10:54 PM, Ryan <ryte...@mts.net> wrote: >>>>> >>>>> the grips are smashing.but nitto needs to make a 26.8 lugged seatpost >>>>> for that lovely bike.just saying >>>>> >>>>> On Wednesday, October 11, 2023 at 8:57:32 PM UTC-5 Bicycle Belle Ding >>>>> Ding! wrote: >>>>> >>>>>> Raspberry Platypus BEFORE: >>>>>> [image: image0.jpeg] >>>>>> >>>>>> [image: image6.jpeg] >>>>>> >>>>>> >>>>>> AND After… >>>>>> [image: image1.jpeg] >>>>>> >>>>>> [image: image2.jpeg][image: image3.jpeg][image: image4.jpeg][image: >>>>>> image5.jpeg] >>>>>> >>>>> >>>>>> >>>>>> On Oct 11, 2023, at 9:53 PM, Bicycle Belle Ding Ding! < >>>>>> jonasa...@gmail.com> wrote: >>>>>> >>>>>> In the same vein as my Bike Style thread, I’m starting a Bike >>>>>> Makeover thread. >>>>>> >>>>>> >>>>>> Every now and then, I get the urge to change up the look of my >>>>>> favorite Platypus. I have it perfect mechanically, but bags and grips >>>>>> and >>>>>> occasionally, saddles, beg to be changed up. It’s fully autumn here in >>>>>> the >>>>>> Great Lakes State, and my ivory Rivet was looking a little out of >>>>>> season. I >>>>>> was gifted a chestnut Rivet from a dear RivSister, so I decided to pull >>>>>> it >>>>>> out and put it on the bike. I took the brown Ergons from my other >>>>>> Platypus, >>>>>> slapped them on and sent her a photo. >>>>>> >>>>>> “That bike deserves prettier grips. Those are ugly,” she said, giving >>>>>> me the unvarnished truth. >>>>>> >>>>>> I looked again. She was right. Back to the drawing board. I finally >>>>>> found these grips from Rivet Cycle Works - Deb told me she had these but >>>>>> didn’t have them up on the website yet. She had the exact match to my >>>>>> chestnut saddle and days later, I had these gorgeous stamped leather >>>>>> grips >>>>>> in hand. The bike looks positively *tonal.* The colors of the paint >>>>>> throw out so many different shades of pinks and reds, thanks to the >>>>>> abundant glitter in the metallic; adding rich leather accessories only >>>>>> elevates the look. The stamped designs on the leather give the bike some >>>>>> texture and add visual interest at the handlebar area. >>>>>> >>>>>> This Platypus is like a little autumn posey. Perfect and pretty, and >>>>>> wholly appointed to its duty. >>>>>> >>>>>> Now if I can just convince Deb to make these in ivory, so I have a >>>>>> pair to match my ivory Rivet saddle when spring comes… >>>>>> >>>>>> Attached in the next post are the before and afters. >>>>>> Leah >>>>>> >>>>>> -- >>>>>> >>>>>> 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/u_2mo2hU3Xo/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/53c9c0cc-59ef-460c-930e-e0c5301545cbn%40googlegroups.com >>>>>> >>>>>> <https://groups.google.com/d/msgid/rbw-owners-bunch/53c9c0cc-59ef-460c-930e-e0c5301545cbn%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/u_2mo2hU3Xo/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/06a4b08b-ce21-4c71-b988-145c2f52115en%40googlegroups.com >>>>> >>>>> <https://groups.google.com/d/msgid/rbw-owners-bunch/06a4b08b-ce21-4c71-b988-145c2f52115en%40googlegroups.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-bun...@googlegroups.com. >>>>> >>>>> To view this discussion on the web visit >>>>> https://groups.google.com/d/msgid/rbw-owners-bunch/2BE84DFF-C38D-47C9-BBC0-A2A4A32B2843%40gmail.com >>>>> >>>>> <https://groups.google.com/d/msgid/rbw-owners-bunch/2BE84DFF-C38D-47C9-BBC0-A2A4A32B2843%40gmail.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/u_2mo2hU3Xo/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/8c98d636-bd04-4cf9-8f15-ce0d11311d8cn%40googlegroups.com >>>> >>>> <https://groups.google.com/d/msgid/rbw-owners-bunch/8c98d636-bd04-4cf9-8f15-ce0d11311d8cn%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/u_2mo2hU3Xo/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/1d683633-23e9-4b3d-b0e3-214beb3bcf4fn%40googlegroups.com >> >> <https://groups.google.com/d/msgid/rbw-owners-bunch/1d683633-23e9-4b3d-b0e3-214beb3bcf4fn%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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