“Trust Me” Versus the Data

Two confident answers, opposite directions. The salesperson said trust me. The machine showed its work. I keep meeting this exact problem in my actual job.

I’m buying a bike. I found the one I want, and now I’m stuck on a question that sounds small but isn’t… large or extra large.

So I did what most of us do now. I asked the dealer, and I asked AI. The dealer rep sells these bikes every single day. He’s moved thousands of them. He is 100,000% certain I want the extra large. AI looked at my height, my inseam, the geometry of both frames, and a few of my own quirks, and it landed firmly on the large. Two confident answers, pointing in opposite directions.

Here’s the part that’s been bugging me. The dealer’s whole case was “trust me, I’ve done this all my life.” Which is fair. He has. But so have I. I was top 20 in Ontario racing XC in the late 90s, and I’ve been on a bike pretty much my whole life. I’ve lost touch with where modern geometry has gone, I’ll own that. I’m no expert on the new numbers. But I’m also nobody’s fool when it comes to a bike, and “trust me” was all I got. No reasoning. No why. Just the weight of his experience landing on the table.

AI gave me the opposite. It walked me through long legs, a lower back that tightens up, hamstrings that do the same. It pointed out an old-school instinct where we size up because XC bikes used to be twitchy, a longer wheelbase calming things down on the trail. Then it told me modern bikes have already designed around that, so the old reflex might be sizing me out of the right fit. None of that is proof. But it’s reasoning I could actually hold up against my own situation, and a lot of it resonated.

So I’m sitting here with the salesperson’s conviction on one side and the machine’s reasoning on the other, and the honest truth is there’s no real advantage for either of them to be wrong. AI isn’t trying to sell me a size. The dealer might be running on a reflex that was right ten years ago. I’ve been misled by bike salespeople very recently, so I’m a little raw on the “trust me” front.

This is the pattern I keep running into in my actual work, and I’m only now finding the words for it. We are watching “trust me, I’ve been doing this forever” run straight into a world where anyone can get thorough, contextual, reasoned-out answers in thirty seconds. Experience is real. Intuition is real. But intuition that can’t explain itself is starting to look thin next to reasoning you can actually inspect. The expert who only has “trust me” left is in a tougher spot than they were a couple of years ago.

The funny thing is the one point everyone agrees on. Go ride it. The dealer says it, AI says it, and they’re both right. I haven’t ridden either yet (I wanted to get this down first so I wouldn’t bias myself). At some point a parking lot won’t cut it. I won’t know how it climbs, how it holds a line over jumps, how it actually feels under me on real dirt. At some point I have to trust something.

I genuinely don’t know where I’ll land. So I’m posting this before I decide, and I’ll follow up with what I actually chose and why. My money’s on the data resonating more than the certainty. But feel is a funny thing, and I’ve been wrong before. We’ll see.