[RBW] Re: Thomson Elite Seatpost -- 26.8 -- with New Sam H.: Seems... Small...?
Hey, Michael: When all else fails, of course, there's the old 'beer can' shim trick. That *always* works, plus you get to drink the beer! BEST REGARDS / Jock Dewey On Monday, March 26, 2018 at 1:18:25 PM UTC-4, Bill Lindsay wrote: > > I have a few thoughts. First off, when in doubt, call Riv. Second, I have > experience with many Rivendell seat lugs. They are very stout and so it > does take some force to get the seatpost clamp bolt tight. Also, it is > possible for the head of the bolt to bind in its hole, making it feel > tighter than it is. The classic indicator of that type of binding is it > will kind of chirp at you as you loosen it. Make sure there’s greas on that > interface under the head of the bolt. Finally I’ve heard anecdotal stuff > about Thomson having tolerance issues. Try any other 26.8mm post, > preferably another brand. If a different post behaves better, then you > Thomson post is more likely the issue. > > Bill Lindsay > El Cerrito Ca -- 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 post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at https://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
[RBW] Re: Thomson Elite Seatpost -- 26.8 -- with New Sam H.: Seems... Small...?
A couple of things that have helped me in the past with slightly small posts: Use no-slip instead of grease or use very VERY little grease, especially where the seatpost clamp is. On one post that wouldn't stop slipping no matter what I put a piece of clear vinyl framesaver/helicopter tape where the seat post was clamped. I quit slipping and also made it easier to tell if it slipped a little. I used a piece that was about 3" vertically, 1-2" wide. Steve On Monday, March 26, 2018 at 11:44:36 AM UTC-4, Michael Doleman wrote: > > Just wanted to get some advice, here. > > I am building my new Sam Hillborne, which takes a 26.8 seatpost. For the > size of frame I use, unless I get a ridiculously short stem (like, 6cm), I > need a zero-setback seatpost. Especially if I want there to be space behind > the saddle to use my Carradice Bagman uplift. I tend to like the feel of a > zero-setback post, anyway, though. > > The only really nice, zero-setback post that I know of, in a 26.8 size, is > Thomson, so that's what I got. It looks great on the bike, but -- man -- > does it ever seem a bit narrow in diameter. I can tighten it down such that > it does, indeed, seem to be properly static in the slot, but I *really* > have to tighten the bolt down hard. Enough so that I'm slightly worried > about it and wanted to know if anyone else has had similar experiences with > Thomson posts. I can almost imagine that sizing-up, to a 27.0, might > actually work, but then I'd be worried about it getting hopelessly stuck. > > Maybe I shouldn't worry, I guess. All things being equal, I think I'd > rather have a seatpost that's a little too tight than a little too snug. > > Anyone have any words of advice and/or reassurance? > -- 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 post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at https://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
[RBW] Re: Thomson Elite Seatpost -- 26.8 -- with New Sam H.: Seems... Small...?
For whatever it's worth, now, just to confirm: last night I tried the two Dajia posts that I have, in a 26.8 size, and those both fit about the same as the Thomson. Which is to say: probably fine in every way. I still feel that the fit is a bit looser than I'd like, but it also seems totally within proper tolerance. And, as someone here already suggested, with the binder bolt properly greased, it ought to be totally fine. On Monday, March 26, 2018 at 8:44:36 AM UTC-7, Michael Doleman wrote: > > Just wanted to get some advice, here. > > I am building my new Sam Hillborne, which takes a 26.8 seatpost. For the > size of frame I use, unless I get a ridiculously short stem (like, 6cm), I > need a zero-setback seatpost. Especially if I want there to be space behind > the saddle to use my Carradice Bagman uplift. I tend to like the feel of a > zero-setback post, anyway, though. > > The only really nice, zero-setback post that I know of, in a 26.8 size, is > Thomson, so that's what I got. It looks great on the bike, but -- man -- > does it ever seem a bit narrow in diameter. I can tighten it down such that > it does, indeed, seem to be properly static in the slot, but I *really* > have to tighten the bolt down hard. Enough so that I'm slightly worried > about it and wanted to know if anyone else has had similar experiences with > Thomson posts. I can almost imagine that sizing-up, to a 27.0, might > actually work, but then I'd be worried about it getting hopelessly stuck. > > Maybe I shouldn't worry, I guess. All things being equal, I think I'd > rather have a seatpost that's a little too tight than a little too snug. > > Anyone have any words of advice and/or reassurance? > -- 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 post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at https://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
[RBW] Re: Thomson Elite Seatpost -- 26.8 -- with New Sam H.: Seems... Small...?
Yep, I meant 0.2mm and carelessly left off the decimal (and same for the other differences mentioned.) My mistake but glad you understood what I was suggesting. On Monday, March 26, 2018 at 12:58:06 PM UTC-4, Michael Doleman wrote: > > Well, it would be a 0.2mm difference, not a full 2mm, but point still > taken: I agree that in a perfect world I don't want to do anything as > drastic as using a wrong-sized seatpost. > > I don't know that I'd trust my reading of my analog/non-dial calipers to > accurately reflect what would likely be far less than a half millimeter > difference. > > I definitely don't see any eyeball-noticeable deformation of the binder, > as I tighten it up, and I can say with fairly strong assurance that there's > nothing amiss with the threading of the actual bolt. That all seems fine. I > just don't care for how much I seem to have to tighten things up to make it > work. Reason being, of course, the looser the post in the slot, the more > the constriction pressure is directed against one particular circumference > of the post, and that introduces what could be a higher-than-desired stress > riser on the post (I would assume). > > I've had a similar issue with other bikes, in the past, and ultimately it > was all fine. But I am mainly wondering if anyone else has had similar > experiences. I'm more used to some very small amount of force being needed > to install the seatpost, even when the binder is completely loose. In the > case with the Thomson/Sam, there is absolutely no force at all needed. The > post would simple fall straight down if you dropped it into the tube -- and > that just doesn't *seem* quite right to me, for whatever reason. > > > > > > > > > > On Monday, March 26, 2018 at 9:37:41 AM UTC-7, Coal Bee Rye Anne wrote: >> >> Hi Michael, >> >> If possible, I'd take a caliper measurement of both the post outer >> diameter and the seatube inner diameter to be sure if either (or both) are >> slightly out of spec. >> >> Going up 2mm would not likely work in your favor if the seatube is spec'd >> correctly at 26.8. >> >> I also wonder if the binder bolt and nut could be contributing somehow >> and binding or somewhat cross threading? Riv seatbinders take easy to find >> metric bolts so you could try an alternate of the same size. >> >> Out of curiosity, do you notice the ears of the seatlug binder pinching >> or deforming such that they get close to touching and bridging the gap when >> tightened enough to hold the post sufficiently? Wondering as I have >> experienced too small posts before (not posts manufactured out of spec... >> but undersized posts that had been used on frames designed for larger >> diameter posts.) >> >> One was a hand-me-down frame that came into my possession with a 26.2 >> installed and a heavily deformed seatbinder. This frame turned out >> to require a 26.8 post after spreading the binder back apart and the 6mm >> difference was significant and easily noticeable. >> >> On the other hand, another frame called for a 30.9 post and the stock >> post was too short for me. I had a much longer 27.2 post and a 27.2-30.8 >> shim available and the 1mm difference of the 30.8 shim vs 30.9 >> seatbinder was minimal enough to not cause any noticeable deformation but >> definitely noticeable when tightening since it required much greater effort >> to get it nice and snug. >> >> Brian Cole >> Lawrenceville NJ >> >> >> >> On Monday, March 26, 2018 at 11:44:36 AM UTC-4, Michael Doleman wrote: >> >>> Just wanted to get some advice, here. >>> >>> I am building my new Sam Hillborne, which takes a 26.8 seatpost. For the >>> size of frame I use, unless I get a ridiculously short stem (like, 6cm), I >>> need a zero-setback seatpost. Especially if I want there to be space behind >>> the saddle to use my Carradice Bagman uplift. I tend to like the feel of a >>> zero-setback post, anyway, though. >>> >>> The only really nice, zero-setback post that I know of, in a 26.8 size, >>> is Thomson, so that's what I got. It looks great on the bike, but -- man -- >>> does it ever seem a bit narrow in diameter. I can tighten it down such that >>> it does, indeed, seem to be properly static in the slot, but I *really* >>> have to tighten the bolt down hard. Enough so that I'm slightly worried >>> about it and wanted to know if anyone else has had similar experiences with >>> Thomson posts. I can almost imagine that sizing-up, to a 27.0, might >>> actually work, but then I'd be worried about it getting hopelessly stuck. >>> >>> Maybe I shouldn't worry, I guess. All things being equal, I think I'd >>> rather have a seatpost that's a little too tight than a little too snug. >>> >>> Anyone have any words of advice and/or reassurance? >>> >> -- 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] Re: Thomson Elite Seatpost -- 26.8 -- with New Sam H.: Seems... Small...?
I have solved a few slipping post issues by sizing up the post by .2mm. Oddly enough all 3 of them have been Reynolds tubing. If I were you I'd buy the next size up and see what it does. Clayton Scott SF, CA -- 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 post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at https://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
[RBW] Re: Thomson Elite Seatpost -- 26.8 -- with New Sam H.: Seems... Small...?
Yeah, I hear you. My hunch is that it's totally fine and 10 minutes into my first ride I'll have forgotten all about it. Main thing is I just wanted to see if someone had some sort of definitive information to the effect of it definitely not being advisable to use a Thomson seatpost with a Sam, or whatever... I had an older Sam, with a 27.2 post, and that also was a Thomson. No issues. I can't seem to recall the "looseness" factor on that one, though. On Monday, March 26, 2018 at 10:33:52 AM UTC-7, Bill Lindsay wrote: > > For the money, if it’s wrong, they’ll replace it for free with no > questions asked, I would wager. Cross that bridge when you get to it. > Regardless, it should be ‘right’ so you can stop thinking about it, and > move on to enjoying your bike. > > Bill Lindsay > El Cerrito Ca. -- 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 post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at https://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
[RBW] Re: Thomson Elite Seatpost -- 26.8 -- with New Sam H.: Seems... Small...?
For the money, if it’s wrong, they’ll replace it for free with no questions asked, I would wager. Cross that bridge when you get to it. Regardless, it should be ‘right’ so you can stop thinking about it, and move on to enjoying your bike. Bill Lindsay El Cerrito Ca. -- 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 post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at https://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
[RBW] Re: Thomson Elite Seatpost -- 26.8 -- with New Sam H.: Seems... Small...?
Yeah, that sounds reasonable. For the money, it's annoying to have to think that the Thomson post would be the problem. The bike came with a Dajia post, which I'm fine with using, were it a zero-setback post. I can't right now recall that it was like, pulling it out. I will check, with it. Also totally agree about the bolt binding -- that could definitely be part of the issue. I didn't disassemble it to specifically apply grease to the interface points. I'll do that and see what happens. The way the binder area on the Sam is reinforced, I have very little worry about any damage, there. It's more about not wanting to have to over-tighten anything, and not wanting to have to be thinking about it while I ride. I've had saddles move, on me, while riding, and it's unnerving. Anyway, thanks for the tips. I'll check it out with the Dajia and see what I can see. On Monday, March 26, 2018 at 10:18:25 AM UTC-7, Bill Lindsay wrote: > > I have a few thoughts. First off, when in doubt, call Riv. Second, I have > experience with many Rivendell seat lugs. They are very stout and so it > does take some force to get the seatpost clamp bolt tight. Also, it is > possible for the head of the bolt to bind in its hole, making it feel > tighter than it is. The classic indicator of that type of binding is it > will kind of chirp at you as you loosen it. Make sure there’s greas on that > interface under the head of the bolt. Finally I’ve heard anecdotal stuff > about Thomson having tolerance issues. Try any other 26.8mm post, > preferably another brand. If a different post behaves better, then you > Thomson post is more likely the issue. > > Bill Lindsay > El Cerrito Ca -- 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 post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at https://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
[RBW] Re: Thomson Elite Seatpost -- 26.8 -- with New Sam H.: Seems... Small...?
Well, it would be a 0.2mm difference, not a full 2mm, but point still taken: I agree that in a perfect world I don't want to do anything as drastic as using a wrong-sized seatpost. I don't know that I'd trust my reading of my analog/non-dial calipers to accurately reflect what would likely be far less than a half millimeter difference. I definitely don't see any eyeball-noticeable deformation of the binder, as I tighten it up, and I can say with fairly strong assurance that there's nothing amiss with the threading of the actual bolt. That all seems fine. I just don't care for how much I seem to have to tighten things up to make it work. Reason being, of course, the looser the post in the slot, the more the constriction pressure is directed against one particular circumference of the post, and that introduces what could be a higher-than-desired stress riser on the post (I would assume). I've had a similar issue with other bikes, in the past, and ultimately it was all fine. But I am mainly wondering if anyone else has had similar experiences. I'm more used to some very small amount of force being needed to install the seatpost, even when the binder is completely loose. In the case with the Thomson/Sam, there is absolutely no force at all needed. The post would simple fall straight down if you dropped it into the tube -- and that just doesn't *seem* quite right to me, for whatever reason. On Monday, March 26, 2018 at 9:37:41 AM UTC-7, Coal Bee Rye Anne wrote: > > Hi Michael, > > If possible, I'd take a caliper measurement of both the post outer > diameter and the seatube inner diameter to be sure if either (or both) are > slightly out of spec. > > Going up 2mm would not likely work in your favor if the seatube is spec'd > correctly at 26.8. > > I also wonder if the binder bolt and nut could be contributing somehow and > binding or somewhat cross threading? Riv seatbinders take easy to find > metric bolts so you could try an alternate of the same size. > > Out of curiosity, do you notice the ears of the seatlug binder pinching > or deforming such that they get close to touching and bridging the gap when > tightened enough to hold the post sufficiently? Wondering as I have > experienced too small posts before (not posts manufactured out of spec... > but undersized posts that had been used on frames designed for larger > diameter posts.) > > One was a hand-me-down frame that came into my possession with a 26.2 > installed and a heavily deformed seatbinder. This frame turned out > to require a 26.8 post after spreading the binder back apart and the 6mm > difference was significant and easily noticeable. > > On the other hand, another frame called for a 30.9 post and the stock post > was too short for me. I had a much longer 27.2 post and a 27.2-30.8 shim > available and the 1mm difference of the 30.8 shim vs 30.9 seatbinder was > minimal enough to not cause any noticeable deformation but definitely > noticeable when tightening since it required much greater effort to get it > nice and snug. > > Brian Cole > Lawrenceville NJ > > > > On Monday, March 26, 2018 at 11:44:36 AM UTC-4, Michael Doleman wrote: > >> Just wanted to get some advice, here. >> >> I am building my new Sam Hillborne, which takes a 26.8 seatpost. For the >> size of frame I use, unless I get a ridiculously short stem (like, 6cm), I >> need a zero-setback seatpost. Especially if I want there to be space behind >> the saddle to use my Carradice Bagman uplift. I tend to like the feel of a >> zero-setback post, anyway, though. >> >> The only really nice, zero-setback post that I know of, in a 26.8 size, >> is Thomson, so that's what I got. It looks great on the bike, but -- man -- >> does it ever seem a bit narrow in diameter. I can tighten it down such that >> it does, indeed, seem to be properly static in the slot, but I *really* >> have to tighten the bolt down hard. Enough so that I'm slightly worried >> about it and wanted to know if anyone else has had similar experiences with >> Thomson posts. I can almost imagine that sizing-up, to a 27.0, might >> actually work, but then I'd be worried about it getting hopelessly stuck. >> >> Maybe I shouldn't worry, I guess. All things being equal, I think I'd >> rather have a seatpost that's a little too tight than a little too snug. >> >> Anyone have any words of advice and/or reassurance? >> > -- 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 post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at https://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
[RBW] Re: Thomson Elite Seatpost -- 26.8 -- with New Sam H.: Seems... Small...?
Hi Michael, If possible, I'd take a caliper measurement of both the post outer diameter and the seatube inner diameter to be sure if either (or both) are slightly out of spec. Going up 2mm would not likely work in your favor if the seatube is spec'd correctly at 26.8. I also wonder if the binder bolt and nut could be contributing somehow and binding or somewhat cross threading? Riv seatbinders take easy to find metric bolts so you could try an alternate of the same size. Out of curiosity, do you notice the ears of the seatlug binder pinching or deforming such that they get close to touching and bridging the gap when tightened enough to hold the post sufficiently? Wondering as I have experienced too small posts before (not posts manufactured out of spec... but undersized posts that had been used on frames designed for larger diameter posts.) One was a hand-me-down frame that came into my possession with a 26.2 installed and a heavily deformed seatbinder. This frame turned out to require a 26.8 post after spreading the binder back apart and the 6mm difference was significant and easily noticeable. On the other hand, another frame called for a 30.9 post and the stock post was too short for me. I had a much longer 27.2 post and a 27.2-30.8 shim available and the 1mm difference of the 30.8 shim vs 30.9 seatbinder was minimal enough to not cause any noticeable deformation but definitely noticeable when tightening since it required much greater effort to get it nice and snug. Brian Cole Lawrenceville NJ On Monday, March 26, 2018 at 11:44:36 AM UTC-4, Michael Doleman wrote: > Just wanted to get some advice, here. > > I am building my new Sam Hillborne, which takes a 26.8 seatpost. For the > size of frame I use, unless I get a ridiculously short stem (like, 6cm), I > need a zero-setback seatpost. Especially if I want there to be space behind > the saddle to use my Carradice Bagman uplift. I tend to like the feel of a > zero-setback post, anyway, though. > > The only really nice, zero-setback post that I know of, in a 26.8 size, is > Thomson, so that's what I got. It looks great on the bike, but -- man -- > does it ever seem a bit narrow in diameter. I can tighten it down such that > it does, indeed, seem to be properly static in the slot, but I *really* > have to tighten the bolt down hard. Enough so that I'm slightly worried > about it and wanted to know if anyone else has had similar experiences with > Thomson posts. I can almost imagine that sizing-up, to a 27.0, might > actually work, but then I'd be worried about it getting hopelessly stuck. > > Maybe I shouldn't worry, I guess. All things being equal, I think I'd > rather have a seatpost that's a little too tight than a little too snug. > > Anyone have any words of advice and/or reassurance? > -- 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 post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at https://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
