And this conversation is why I enjoy the Riv List in the Winter months. Lots of talk. Lots of opinions. Here's mine :
We talk and talk and talk about fit and sizing. When it comes down to it, if you aren't 100% sure on the fit, don't buy it online. I make many purchases online, but almost never shoes or pants. Those are things where fit matters to me. Someday Soma might either build more or distribute them better and there might be one at a shop near you. Sit on it and see. Realistically though, expecting a small company to make a stock frame to fit short or tall people at the two extremes really isn't going to happen. Like it or not, the world is built around the 5' 9" unisex humanoid. At 6foot and 210# I can shop for clothing at WalMart and bikes from just about anyone. If I was 6' 9" and 350#, I'd be heading to the big and tall shop and riding a custom or tall specific frame from a company like Rivendell. Seriously, how many companies stop at a 60-63cm frame. Be happy with a 65. Cheers, Scott Henry Dayton, OH FTM-PTB On Tue, Nov 12, 2013 at 8:06 PM, Bill Lindsay <tapebu...@gmail.com> wrote: > There are names for both of these measurements and their position in space > is not ambiguous. You don't need to rotate photographs or draw lines on > anything. You do need to look at the numbers and trust that Boulder is > publishing accurate numbers. I do trust them, but it never hurts to > doublecheck with them. > > Referenced from the center of the BB, the tippy top of the seat tube > extension on a 65cm Soma Grand Randonneur is simply 650mm x sin(72.5 > degrees) = 620mm vertically higher than the BB. The tippy top of the > headtube of a 65cm Soma Grand Randonneur is defined as the "Frame Stack", > and is published as 637mm. So the top of the head tube is 17mm higher than > the top of the seat tube extension. It's not level, and it's not lower in > front like a track bike, it's a little bit higher in front. 17mm. > > But nobody really cares where the frame ends. Jim wants to know if he can > get the bars level. For a rider like Jim with a PBH of 99 who maybe has a > SH of 89, that would mean the saddle top will be hovering nearly 850mm > vertically above the BB plane. That's no problem with a longish seatpost. > In order to get the tops of Jim's handlebars equally high, his handlebar > stack would need to be ~213mm higher than the frame stack. Estimate that > you get about 30mm from the headset and steertube stack, meaning Jim would > need a stem that gets him about 180mm of vertical above the min insertion > line. I don't know where the min insertion line is on a 225mm Nitto, but I > doubt that will get your bars to level. A dirt drop would almost certainly > get you there, it has like 200mm of vertical above the min insertion line, > but not much reach. > > The thing to ask Boulder is how much extra steertube there is on the fork. > If there's a lot of extra steertube, allowing you to run a big old stack > of spacers, then maybe your 225mm Nitto at max height might get you up > there. > > For comparison, that 64cm Hillborne would have substantially more frame > stack. By my calculation, the top of the headtube on a 64cm Hillborne will > be (ballpark) 50mm higher than it is on the 65cm Soma. That's 50mm of > elevation you don't need to get from your stem. > > > On Tuesday, November 12, 2013 4:09:20 PM UTC-8, Tom Harrop wrote: >> >> Guys, >> >> Sorry to stick my oar in but it seems to me that the question is how the >> seat tube (frame size) is measured. >> >> If it's measured all the way to the top of the seat tube where the >> seatpost clamp is, then the HT extension will be (roughly!!!) cancelled out >> by the seat tube extension, and the bike will fit (roughly) like it's got a >> level top tube. >> >> On the other hand if it's measured only to where the top tube joins the >> seat tube, then the head tube extension will add some handlebar height with >> respect to the stated frame size (i.e. it will fit like it had a slightly >> up-sloping top tube). >> >> Right? >> > -- > 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 http://groups.google.com/group/rbw-owners-bunch. > For more options, visit https://groups.google.com/groups/opt_out. > -- 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 http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/groups/opt_out.
