On Wednesday, at the suggestion of The Excellent Wife (TEW), I went out on Al P's Wednesday Allentown ride, with a neighbor, David G, who lives in the same over-55 community that I do.
He did a route to Emery's Farm (see it on the ride page). It's a good route, and it was a good day... but something was off for me about the ride; the Yellow Maserati, my titanium bike, just didn't feel right to me.
When we stopped at Emery's, I found out what the problem was: I'd broken a spoke on my rear wheel, and the wheel had gone enough out of true that it was binding on the caliper brake on every rotation. I'd built this wheel years ago, and had to rebuild it when there was a problem with the rim, so I wasn't either terribly surprised or terribly upset about it.
Technical stuff you can skip: On a rear wheel for a bike that uses caliper brakes, the right spokes are much shorter and tighter than the ones on the left because of the presence of the cassette, where for the corresponding front wheel, the spokes are of the same length and tightness on each side, if the wheel is assembled correctly. (With disk brakes, the front wheel has a similar issue, but the left spokes are tighter, due to the presence of the rotor; the issue with the rear wheel with a disk brake is similar to the issue with the caliper-brake wheel, but less pronounced, having an allowance for the caliper on the right and a lesser one for the rotor on the left.)
More technical stuff you can skip: when I built these wheels, I was taken with a rim that was surprisingly light for a rim of its class. It turned out that the lightness was achieved at the cost of rigidity. I built the wheels three-cross on both sides (that is, each spoke crosses three others on the way from the hub to the rim), and I found every time I put power down (like on a climb), I had the most annoying creaking from the rear wheel. No amount of tightening of the spokes eliminated it, and I ruined another rim trying to get them tight enough to stop creaking. I finally re-strung the left side of the wheel so that the spokes on that side did NOT cross, and that eliminated the problem. But the excessive tightening had affected the rim, so I noticed some cracks when I removed the wheel, and the changes in spoke tension probably ultimately caused the broken spoke.
So there I was at Emery's, with the gang making noises like it was time to depart. I could have tried to true the wheel enough so it would go through the brake (yes, I have spoke wrenches on my bike for that; they're in my multi-tool, and I have used them on a fellow rider's bike)... but that would take time, so I decided just to undo the cable on the rear brake, and use just the front brake on the ride back to the car. (I teach the class in Basic Bicycle Maintenance for Princeton Adult School, and have a unit where I talk about how the front brake does most of the braking, so I was confident I could do this.)
At one point, we had a stop at the bottom of a downhill, and if I'd started braking a second later, we might have had another insurance claim... but I stopped in time, and rode with more braking distance after that. The bike went well with no brake interference in the back!
After arriving home, I popped on another wheel from my supply (it will surprise no one who knows me that I have extra wheels), did the necessary adjustments, and the Yellow Maserati is ready to take on more rides!
(Yet MORE technical stuff you can ignore: the maximum tire size I could get on the Yellow Maserati was 25mm wide, because of the limited clearance at the back brake bridge. The rear wheel I'm using now is wider, and may allow for a 28mm tire, and I would like the ride-quality benefits of a wider tire. I have a 28mm-wide tire on order, and even if it doesn't fit the Maserati, I can use it on my wife's bike, which has much more sensible tolerances.)