Re: GB Cypress failures I had the same thing happen to one of two Cypress tires. In my case it was the front that developed the bulge, after at most 300 miles of use. The tread still looks like new. It looks like either a few cords in the carcass of the tire have broken or the plies have separated to allow the bulge. The bulge was far from contacting the fork, but it was unpleasant to ride (thump, thump, thump) and I did not want to risk a total failure and blowout. For the record, I weigh between 175 and 180 depending on the phase of the moon, didn't ride the bike with more than a minimal load, and only on pavement.
I rotated the other Cypress to the front and replaced the bad tire with a Maxy Fasty. The MF weighs 360 gm to the GB's 300, but I feel little difference on the road. I'm keeping a close eye on the remaining GB, and keeping the inflation pressure lower than before in case that makes a difference. The GB's fit VERY loosely on the Synergy rims. Looser than the CdLV's on my commuter, looser than any other tire of any size I ever mounted. I have to take special care to keep the bead down into the rim as I inflate the tire. They seem fine once seated, but I'd rather have a snugger fit. I have a another Maxy Fasty standing by for when the second GB goes south, and for now don't plan on going back. It's a little surprising to me that any Riv would have a brake bridge so low that a bulging Cypress could even come close to it. I'd expect any 650b Riv would take at least a CdLV, if not a Fatty Rumpkin. Was this a conversion from a 559 bike? Bill On Apr 25, 11:03 pm, Chicken Sandwich <brons2.li...@gmail.com> wrote: > Yes, that is what I am speaking of when I referring to the failure > mode: a bulge that eventually will not go under the brake bridge > anymore. This has happened to all the rears that I have mounted. > None have lasted longer than 1200 miles. The fronts don't last that > much longer. This is mostly in brevet usage. > > I may be exceeding the weight rating of the tire, I weigh 240 and I > ride a Rivendell with lots of gear along for the ride. The tire > weight limit is 275. You do the math :-) > > I still love the tires and will continue to run them. > > On Fri, Apr 24, 2009 at 2:08 PM, Patrick in VT <psh...@drm.com> wrote: > > > > > > > On Apr 24, 12:32 pm, Chicken Sandwich <brons2.li...@gmail.com> wrote: > >>Failure mode seems to be a large bulge in the tire that eventually > >>>contacts the brake bridge. > > > yikes! what do you mean by "failure?" repeated flatting, blow-out, > > or what? > > > to be clear, you're saying that a bulge develops (presumably near the > > end of the tire's life), then eventually gets so large that it's > > contacting the frame? > > > that can't be very pleasant to ride on, even well before it hits the > > brake bridge! has this happened with more than one tire? > > > i'm curious b/c i get considerably more mileage out of my GB cypres > > and have never encountered this issue. > > > that's a bummer - especially considering the cost of these tires. --~--~---------~--~----~------------~-------~--~----~ 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-bunch@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 -~----------~----~----~----~------~----~------~--~---
