I rode all last summer and autumn on an old mountain bike that was too small for my physical size. I'm 5' 10" with a 33" inseam, and the bike had a 16" frame. Other than some knee pain caused by not being able to raise the saddle high enough, I was pain free. I had a great time.
That old bike is gone now, and I've purchased a new mountain bike with an 18" frame. The size feels perfect, and the knee pain is gone. But now I'm confronted with a new issue. I'm getting rubbed raw between my scrotum and thighs. These are not saddle sores, as they're not around the buttocks or perineum. I've never in my life had an issue with saddle sores. These raw spots are up higher, to the left and right of my penis.
Truth be told, I don't wear any sort of specialized bicycle clothing. Just underwear and either jeans or cargo shorts. I'd blame the clothing, but it's the same exact clothing I wore last year. The clothing hasn't changed, and my mileage hasn't changed either. I just take it out for nightly trips to Dunkin' Donuts and back. A total ride of about 4 miles.
I thought it might be the new seat at first, so I tossed on the seat that I used last year. The problem persisted. I have no clue as to what is causing this. The only changes that I can think of are the bike itself and me aging 6 months.
Any good ideas? Saddle tilting? Saddle height? Different distance between saddle and handle bars? Has anybody else experienced excessive rubbing this far up?