In discussions of the bicycle seat, we talk about the effect on a rider's butt, but the points of contact are pretty far under, where the ischial tuberosities contact the saddle in much closer relation to the perineum than the big ol' glutes hanging out the back there. It's a much more crotchal than gluteal situation, especially when a long period of longer rides might lead to some abrasion. Then you have to factor in whether you have protuberant parts that flop around in front, or internally folded parts more vulnerable to multiple kinds of friction.
Time changes us. I used to be as comfortable as one can be on a racing bike seat, on saddles shaped like the Sella Italia Turbo or the Avocet Racing II. When I bought a Brooks leather saddle because I was tired of wearing out modern saddles, I picked the Colt, based on the Turbo shape. It worked well until it no longer worked at all. I don't know if it deformed because of an error of mine or an inherent flaw in the design. All I know is that it no longer supported the parts that needed support, transferring pressure to the exact wrong area.
It doesn't seem like much. For decades it wasn't. But in the past three years or so that little arch has led to distracting discomfort on rides longer than about 25 miles.
When I replaced the Colt with the B17 "carved," I was mainly curious about the cutout. The overall width seemed like it might be a problem, because too wide a saddle will push you forward onto the parts you wanted to avoid. I have noticed the width when I'm pushing the pace in a low position, but it hasn't caused a problem. A rider in varied terrain will shift position on the saddle to improve pedaling efficiency at different cadences and intensities. This is the primary reason that racing saddles are narrow. My high intensity efforts are limited to what terrain and traffic demand along my regular routes. They're also limited by being an old fart who will blow right up if I try to pretend that I'm in racing shape. The B17 turned out to have a good combination of features for long-term comfort
for me.
I noted the flat top line right away, but didn't focus on it as a primary feature until I got a B17 Narrow for my sporty road bike. The Colt experiment had been a failure, and it was no longer offered anyway. The dimensions of the B17 Narrow sounded hopeful. It has worked well. The flatness of the frame supporting the seating area at the rear has kept it from developing the painful crest that the Colt did.
Below is the interim seat I dug out of a box of salvaged saddles because it was firmer and flatter than the seat I'd been using on the Traveler's Check. It has less arch than the Turbo, but still has some. So it was better, but still not great. The texture of the covering material also produces a very authentic-sounding fart noise when you shift position on it.
Looking at saddles on the market now, a lot of them have that graceful arch. It has a long heritage in the galaxy of saddle shapes produced by the bike industry since the late 19th Century. However, when you make a point to compare, the flat-top type appears perhaps more frequently. I started riding in the 1970s. My first drop-bar bike had an old and somewhat abused Ideale leather saddle. I replaced that with an Avocet touring saddle on the advice of my expert mentor. For years afterward I bought molded-shell saddles without questioning the concept, wearing through the covers after a few years and replacing them in a conveyor belt to the landfill.
Leather saddles wear out, too, but leather biodegrades completely, and the metal frame either rusts away or can be recycled. They're heavier than molded-shell saddles, but that's only a drawback if it matters to you. I don't know if there's a good alternative for anyone who disapproves of leather because animals were killed for it. If it comes to that, we can just radio tag wild large herbivores and swoop in when they die of natural causes, to harvest some hide before the carcass is dismantled by natural forces. Make saddles out of laminated road-kill squirrel pelts. Or maybe there's a hemp alternative. There always seems to be a hemp alternative.
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