Leah You asked: " Maybe the 650b wheels will be less floppy with this rack? Maybe the smaller, lighter bike won’t seem as penalized by the heft of this rack?"
The 650B wheel have a minimal effect on Wheel Flop, since the wider tire results in a tire radius close to a 700C x 32 tire (650x48 radius = 344mm vs a 700C x 32 radius = 347mm). Using Jim Youngs on line trial/flop calculator Bicycle Trail Calculator | yojimg.net <http://yojimg.net/bike/web_tools/trailcalc.php> with the following frame geometries from RBW for a 50cm Platy with 650B wheels: HTA, 69.5°, from RBW geo charts Fork Rake, assumed to be 55mm. RBW does NOT publish fork rake and the 55mm is from a 50 Cheviot with 650B wheels. Wheel/Tire, assumed to be 650B x 48, RBW states 50mm as the largest tire. Trial and Flop are solely determined by Wheel Radius, HTA, and fork rake: Flop = Trail x sin(HTA) x cos (HTA), and Trial = (Wheel Radius x cos(HTA) - Fork Rake) / sin (HTA) Here are the results for a 650x48 and a 700x32 tire for the 69.5° HTA and 55mm Rake 650x48 700x32 Trail 70mm 71mm No surprise, RBW models are known to have high trail, due to slack HTA and a nominal 2" fork rake Flop 23mm 23mm High Flop is direct result of the high trial So the Trail and Flop are essentially the same for a 650x48 and a 700x32. If you use 650x42, Trial and Flop are slightly reduced Trail = 68mm & Flop = 22mm Frame weight or bike weight does not affect trail or flop per the above equations. Your lighter custom will handle the same with the basket as your other Platy. IF you reduce the weight carried in the basket, you will notice less side to side motion at low speeds, due to the downward force produced by the lower weight (mass). I hope this helps John Hawrylak Woodstown NJ On Sunday, March 10, 2024 at 12:34:26 PM UTC-4 Bicycle Belle Ding Ding! wrote: > [image: IMG_5598.jpeg][image: IMG_5582.jpeg]Hi Friends, > > I’ve had a Nitto Basket Rack from Rivendell for a few years. I think it > looks awesome, it’s dead useful, but it annoyed me that it was heavy and > made my bars swing around on my mermaid Platy. But as I plan the build for > my 50 cm purple Platy (which is taking a million years) I am considering > putting the basket rack back into service. It pains me to see it sitting, > and it’s so pretty and unique that I just want to give it another try. > Maybe the 650b wheels will be less floppy with this rack? Maybe the > smaller, lighter bike won’t seem as penalized by the heft of this rack? It > would be such an easy experiment if it wasn’t for the dyno light/wiring > that is affected by the decision. It’s not a matter of simply pulling the > rack, because wire length, light mount, etc are affected and will not be an > easy switch. My shop hates soldering and I certainly can’t do it. > > I had started a thread long ago about this and a lot of people reported > similar experiences. Now that some more years have gone by, I’m curious if > opinions have changed, or if more people have these racks and would offer > their opinions. There isn’t much in the way of reviews to read online. > Maybe some here would offer theirs. If more folks are trying and loving > their Nitto Basket Racks, I’ll be likely to install mine. > > Meanwhile, this beautiful Platypus sits in my living room on the shelf, > waiting for its parts to return from the anodizer. And, there’s fresh snow > on the ground. But talking bikes will get me through! > Leah > -- 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/8c0667a7-63a0-478f-a5ae-a8d75c06099bn%40googlegroups.com.
