Eric- I believe there were indeed a batch of CR-18s made several years ago that were out of specification; the diameter was larger than 622 mm. I don't know if they were mis-labeled 630 mm (aka 27") rims or just bad quality control.
Perhaps yours were from that batch? Where and when did you get them? In my experience, it's mostly about the rim. Tubeless-ready rims have a tighter fit and are harder to mount tires to. For example, my Pari-Motos are tougher to mount on my Pacenti PL-23 rims (tubeless-ready) than they were on the previous Velocity Synergy rims. Since the CR-18 isn't tubeless-ready, it has to be something else. On Thu, Nov 30, 2017 at 2:26 PM, Eric Karnes <epkar...@gmail.com> wrote: > Hi Bill- > > Yep, I used Stan's tubeless rim tape on the A23s as specified. I don't > remember them being quite as bad as the Sun rims, but they were still > difficult. I'm a pretty mediocre home mechanic and I'm sure I could improve > my technique, but I also rarely require more than on tire lever even on > tighter tires. On the Sun rims, it's just ridiculous. It feels like I'm > trying to stretch a 650b tire onto a 700c rim. If nobody else has run into > this problem, I'm beginning to think that there might be something wrong > with the rims. I did a bit of research and have come across similar > complaints with that rim. Sigh. > > Eric > > > On Thursday, November 30, 2017 at 3:16:51 PM UTC-5, Bill Lindsay wrote: >> >> A-23 rims are tubeless compatible. This means you should/must use >> tubeless rim tape, even if you are running tubes. Stans, or an equivalent >> thin, slippery rim tape is necessary, unless you want to make your life >> miserable. What rim tape are you using? >> >> The very tightest tires take me about a minute to install with my bare >> hands. The very tightest tires might require me to use one tire lever to >> remove in about 15 seconds. I believe it's possible to have defective >> oversized rims that make it unnecessarily difficult to get tires on and >> off. Have a good mechanic remove and install your tires with you watching, >> and decide whether you can make improvements to your technique. >> >> Bill Lindsay >> El Cerrito, CA >> >> On Thursday, November 30, 2017 at 9:32:24 AM UTC-8, Eric Karnes wrote: >>> >>> Hi all- >>> >>> I have a question about the fit of supple tires and the way they fit on >>> rims. >>> >>> I've had only two experience with very supple tires. Pari-motos on >>> Velocity A-23s (650b) and most recently Compass Snoqualmie Passes on Sun >>> C-18s (700c). Both tires are so tight to the rim they're very difficult to >>> get off and damned near impossible to get back on. I recently changed a >>> tube on the Squoqualmie Pass / C-18 wheels and it took me over 30 minutes >>> to muscle the tire on the rim. Frankly, I don't want to ride the bike, >>> because if I got a flat after dark, I honestly don't know if I'd be able to >>> replace the tube/tire in the field. Now, I've changed many, many flats and >>> have never had this issue with 'regular' tires (usually on OpenPro rims). >>> It usually takes me under a minute to get a new tube and tire back on. >>> >>> So...is a normal experience for these super supple casing tires? Or is >>> this a 'correlation not causation' situation and I've just been unlucky in >>> my choice of the rims I paired them with? Any advice would be appreciated! >>> Thanks guys! >>> >>> Eric >>> >> -- > 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 https://groups.google.com/group/rbw-owners-bunch. > For more options, visit https://groups.google.com/d/optout. > -- 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 https://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
