I forgot to add that back 35 years ago rim mfrs manufactured and marketed 13 mm IW rims — there was a whole slew of “semi-aero” very narrow 26” rims made by Sun and Trek among others — explicitly for offroad use on 2” mountain bike tires. No one gave this a second thought and I, assiduous reader of the cycling press, never read of any failures or recalls.
On Fri, Oct 10, 2025 at 2:21 AM Patrick Moore <[email protected]> wrote: > As I’ve said before, I rode 50 mm knobbies on 13 mm IW rims. When I had Co > Cyclist (I think) build my first custom mountain bike rims back circa 1992, > I chose Sun M14A rims, again, 13 mm IW. They worked fine over thousands of > miles with the usual 2” knobbies of the day as long as you kept the > pressure high enough. FWIW, the Suns are very light at 360-370 grams (I use > them as road rims nowadays) but also very strong indeed. More recently I > rode 76 mm tires on 19-21mm IW rims; again, no problems. > > Upshot: a 40 mm tire on an Open Pro might break somebody’s rules but it > will cause no problems, > > On Thu, Oct 9, 2025 at 2:55 PM Brent Eastman <[email protected]> > wrote: > >> I just acquired a soma san marcos with mavic open pro rims, inner rim >> width of 15mm. >> >> I immediately put 40mm tires on it, and have been riding it for a few >> weeks as I dial in the build. >> >> It has a cycle ops power meter rear hub, looks gross, so I was planning >> on rebuilding the rear wheel with a cuter hub, but then realized I was >> fully in violation of the acceptable range of tire width for this rim. >> Should I just get a different wheelset? >> >> the rim widths recommended by rene herse and sheldon seem to be >> conservative at 15mm but then generous at 17mm, idk, is anyone cheating and >> getting away with it? >> >> >> -- >> 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 [email protected]. >> To view this discussion visit >> https://groups.google.com/d/msgid/rbw-owners-bunch/addb054e-edcc-4a6b-98d1-48501aa8966bn%40googlegroups.com >> <https://groups.google.com/d/msgid/rbw-owners-bunch/addb054e-edcc-4a6b-98d1-48501aa8966bn%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> > > > -- > > Patrick Moore > Alburquerque, Nuevo Mexico, Etats Unis d'Amerique, Orbis Terrarum > > ------------------------------------------------------------------------------------------------------- > > Executive resumes, LinkedIn profiles, bios, letters, and other writing > services > > > ------------------------------------------------------------------------------------------------------- > > *When thou didst not, savage, k**now thine own meaning,* > > *But wouldst gabble like a** thing most brutish,* > > *I endowed thy purposes w**ith words that made them known.* > -- Patrick Moore Alburquerque, Nuevo Mexico, Etats Unis d'Amerique, Orbis Terrarum ------------------------------------------------------------------------------------------------------- Executive resumes, LinkedIn profiles, bios, letters, and other writing services ------------------------------------------------------------------------------------------------------- *When thou didst not, savage, k**now thine own meaning,* *But wouldst gabble like a** thing most brutish,* *I endowed thy purposes w**ith words that made them known.* -- 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 [email protected]. To view this discussion visit https://groups.google.com/d/msgid/rbw-owners-bunch/CALuTfgtcXDJcn57w0_oOCvj2oDhcTmLZnkiP_rrrYapvMzLVdA%40mail.gmail.com.
