Peter, Thank you for your insight on this. I weigh about 180lbs and run my Marathons at around 25 psi and 32 psi front a rear respectively (a little more depending what I'm carrying). I don't know if these lower pressures are a culprit, but it doesn't seem so according to what you've said. Velocity has been great about offering to replace the rim with a more suitable one (Cliffhanger).
On my mountain bikes, I've run Mavic 719s forever with 2.25 tires. These rims seem to have a similar width as the Dyads, and I've never split a rim with fat tires. I got a set of wheels that are almost 20 years old and they still ride true after being beat to hell and back on my hardtail. Cheers, John On Monday, June 22, 2020 at 4:01:11 PM UTC-7, Peter White wrote: > > I'm a Velocity distributor. But their recommended tire sizes make no sense > to me. > > The problem with fat tires isn't that they're fat. It's that the tire > manufacturers give pressure ratings that only take into account the tire's > ability to stay on the rim, rather than a tire pressure that actually > delivers a good ride, and doesn't put excessive force on the sidewall of > the rim. For example, Schwalbe says that if the rider weighs 240 lbs, a > 50mm wide tire should be inflated to 70psi. This is absurd. At the same > pressure (psi) the larger the tire, the more force is applied to the rim's > sidewalls. It's POUNDS PER SQUARE INCH, and when you increase the square > inches of the tire's surface area, you increase the load on the sidewalls > of the rim. So it's no wonder that we see rims failing due to cracks in the > sidewalls, and cracks under the rim strips. > > Peter White > > On Mon, Jun 22, 2020 at 1:50 PM John Rinker <jwri...@gmail.com > <javascript:>> wrote: > >> Good morning, >> >> Just wondering if anyone else has had an issue with Velocity Dyad rims >> splitting on the sidewalls while running fatter tires. I have been running >> some Schwalbe Marathon Mondials (28x2.0) and muy rear rim recently split. I >> am told by Velocity (who has been very helpful, indeed) that the tires are >> too big for these rims. >> >> I love the tires and the rims, but perhaps I need an alternative to the >> Dyad to run these tires. Any recommendations? >> >> Cheers, >> John >> >> -- >> 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-owne...@googlegroups.com <javascript:>. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/rbw-owners-bunch/a6341cc6-94fa-4b99-88f5-1652f198c93fo%40googlegroups.com >> >> <https://groups.google.com/d/msgid/rbw-owners-bunch/a6341cc6-94fa-4b99-88f5-1652f198c93fo%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> > > > -- > Peter White > -- 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/34b5b1d4-1cf9-4e16-a79b-87f943a894cao%40googlegroups.com.
