Michael, I believe Grant recently posted that he would make larger Atlantis sizes as a special order.
I own a 64cm Atlantis and love it! Angus On Aug 15, 1:31 pm, MichaelH <mhech...@gmail.com> wrote: > Over the years, Rivendell has trimmed its offering of larger sizes, > independent of tire size. They don't offer anything equivalent to the > Redwood, which went to 68, and have stopped offering the Atlantis in > even a 64. I don't own an Atlantis but if it came in a 64, I would be > tempted. > > michael > > On Aug 15, 1:29 pm, RoadieRyan <rya...@hotmail.com> wrote: > > > Is it possible the "retreat" from larger sized 650b is simply a > > business decision? I get the impression, no hard facts, that there is > > less demand for larger sizes, especially over say 62 cm, than the mid- > > range, so it would follow that demand larger sizes spec'd for a "non > > traditional" wheel size is pretty niche. > > > With a tough economy, constraints on manpower and financial resources > > it would make sense to me that Rivendell would build to meet the > > greatest demand in order to maximize sales and revenue. Not that the > > bottom-line drives their business but it is a big consideration. And > > for those folks who really want a larger size designed around 650b > > there is always a Riv custom, so its not like they are left with no > > options. > > > just my uninformed 2 cents > > > Ryan > > > On Aug 15, 6:47 am, MichaelH <mhech...@gmail.com> wrote: > > > > I think this is right. I don't think Grant has "retreated" from 650B > > > for larger sizes. He has always argued in favor of wider road tires, > > > 28-35 mm, and that it is easier to achieve that on small frames with a > > > 584 rim diameter because the 622 size forces unwanted compromises on > > > the frame design. This isn't true in larger sizes, as shown by the > > > AHH, my Ebisu and SOMA dbl. cross. > > > > I have never felt the need for anything larger than 38 on dirt or > > > even gravel roads However, it is also true that smaller rims are > > > stronger. Our road tandem runs on 559 rims with 1.6 Marathon Racers > > > and carries 380 lbs over dirt roads with remarkable strength and > > > comfort. If you are riding trails, than you are essentially talking > > > mountain bike design for tires that are bigger yet. Grant's focus has > > > traditionally been road bikes that handle trails as well, only > > > recently has he offered a "pure" mountain bike. > > > > michael > > > > On Aug 15, 2:01 am, Bill Gibson <bill.bgib...@gmail.com> wrote: > > > > > I always thought of 584/650B as a way to get more tire in the right > > > > frame size with all the right clearances for fenders, etc. more than > > > > any other reason. And that especially for smaller sizes that even > > > > smaller wheels - 559/mountain bike size or - in my wife's case, for > > > > her mountain bike, 507/24" (she is 4' 10"), are required for > > > > stand-over heights, etc. Seeking optimums in moments of inertia, > > > > various hysterises (is that a word? what is the plural of hysteresis? > > > > hysterii?), aerodynamic resistance, rolling resistance, pneumatic > > > > trail, contact patch shape, and so on has to be a matter of...personal > > > > taste and much further research? Maybe matching to load and road > > > > surface, too... > > > > > Amazing how little changes have such strong real or placebo effects... > > > > > On Sat, Aug 14, 2010 at 9:16 PM, PATRICK MOORE <bertin...@gmail.com> > > > > wrote: > > > > > Rob Perks wrote: > > > > > >> The volume of air that affects rolling resistance is the cross > > > > >> section > > > > >> of air directly above the area of deformation. Therefore it stands > > > > >> to > > > > >> reason that wheel diameter should not play into that. > > > > > > It is, so they say -- I am not an engineer -- the contact patch (a > > > > > sign of > > > > > which is that tire suppleness affects rolling resistance greatly, > > > > > indicating > > > > > that it is the contact patch and not just air volume) that, all else > > > > > equal, > > > > > determines rolling resistance, and that is certainly affected by wheel > > > > > diameter. > > > > > Snip. > > > > >>WRT to smaller wheels and faster acceleration, I have ridden 26" - 29" > > > > >>with all sorts of tires and still feel that the greates factor > > > > >>affecting acceleration is the weight not as much the diameter. e. > > > > > Not quite, I think. First, it is indeed the smaller size that makes > > > > > smaller > > > > > wheels so light. You save 100 grams or so at the circumference on the > > > > > rim > > > > > and 50 more on the tire, ceteris paribus -- my Sun M14A 559s weigh > > > > > 360 gr > > > > > (and are strong enough that I had no problems at all off road) and > > > > > the 559 > > > > > Turbos and Conti GPs weigh just under 200 gr. And then add the > > > > > cumulative > > > > > effect of taking a bit over an inch off each spoke. My old > > > > > Ultegra/nothing > > > > > special 8-9 sp 559 wheelset weighed about 1500 grams with rim tape, no > > > > > skewers or cassette. > > > > > Second, most of that weight is at the circumference and we all > > > > > remember the > > > > > Law of Moments. > > > > > Again, riding fixed, you can certainly feel the difference. > > > > > > -- > > > > > You received this message because you are subscribed to the Google > > > > > Groups > > > > > "RBW Owners Bunch" group. > > > > > To post to this group, send email to > > > > > rbw-owners-bu...@googlegroups.com. > > > > > To unsubscribe from this group, send email to > > > > > rbw-owners-bunch+unsubscr...@googlegroups.com. > > > > > For more options, visit this group at > > > > >http://groups.google.com/group/rbw-owners-bunch?hl=en. > > > > > -- > > > > Bill Gibson > > > > Tempe, Arizona, USA -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To post to this group, send email to rbw-owners-bu...@googlegroups.com. To unsubscribe from this group, send email to rbw-owners-bunch+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en.
