Something of a saddle junkie here, so already have a few indoor trainer rides on the Delta 38. Photo below shows it next to the JOF55 (which actually works pretty well for me, but I cant help trying new ones in the quest for ever better comfort.) Anyway, for me, the Delta 38 definitely rides "narrower" than the JOF55. The overall width at the nose is less, but also it feels like the width of each prong is slightly less wide all the way back toward the rear of the saddle (at least up to the farthest rear point I would actually ride it.) The sides of the saddle at the nose are also cut more vertical on the Delta 38 than the JOF55, so no matter how far back I sit on the Delta 38, generally a more roomy feel between saddle and thigh compared to where my thighs might rub slightly on the JOF 55. I am still alternating rides between both saddles, but I think so far, for me, I slightly prefer the somewhat thicker width of each prong on the JOF55 (feels like more total area supporting my weight even when I am trying to ride exactly where each saddles has the same overall width across the saddle, if that makes sense. Maybe if I was lighter, it would help? I'm 6'4 185#) YMMV. FWIW, the firmness of the padding on the Delta 38 does feel just a bit firmer to me, but my JOF55 has a few years of riding on it now. Overall, I can see the Delta 38 being a great option to try for someone who feels the JOF55 is just too wide and/or causing too much thigh rub. For me, I'm curious to try the JCOB Type 5 to see if it feels at all different from the JOF 55. Hope that helps.