Fat people are pretty common, they’re not a rare body shape or disability that should require a custom bike.

Bikes are, in general, designed to be as light as they can be for their price point. The reason behind this is that a lighter bike is less weight to move, meaning for the same effort one can potentially go farther or faster than they would be able on a heavier bike. So when a company is designing a bike, they think about the person they believe will buy it and design a bike that will support that rider.

Heavier people weigh more, obviously. Larger loads require more structural strength. Making a bike that can carry a 300lb+ person without breaking involves a redesign if you initially designed for lighter loads. Similarly, building it requires change to your manufacturing processes.

People who have health problems due to their weight, in general, do not buy as many bikes as people whose weight does not negatively impact their health. A company isn't going to go an make a big production run of an expensive product if they don't think there's a market for it, which means it becomes a custom job to get one done.

Want cheaper bikes that can handle 300lb+ riders? Do a kickstarter and see how many customers will put down dollars.

A custom bike sounds expensive, I really wish there were more east-to-buy prebuilt options.

Yes, it can be expensive, but being obese is expensive. Some people have to go out of their way to buy "big and tall" clothing (at a premium), special beds or chairs, modifications to their car, etc.

Fat people are pretty common, they’re not a rare body shape or disability that should require a custom bike.

Fat people may be common, but heavy-duty bikes are not. For a bike to be stronger, you either have to sacrifice on cost, the weight of the bike, frame materials, or hard-to-find/custom gear.

It becomes a problem when someone is looking for a cheap bike, because none are going to be built to carry an enormous amount of weight.

And I do wish higher weight limit tires were more common, I’m not overweight myself but I sometimes heavily load my electric bike with cargo (and a trailer that pushes down on the rear axle), and occasionally I have problems with spokes breaking already.

They are... for a price. You can get tires and wheels built to handle more weight, but you'd have to pay a premium for them, and be willing to sacrifice their size/weight.

You also have to be realistic of what you're getting. If someone weighing 300lbs wants to get a small folding bike, they aren't going to have much luck with anything.

I fitted new wheels on my MTB turned touring-capable bike, and had to get 36 spokes and very beefy schwalbe tires to accommodate the load. I spent a lot more than someone who doesn't have to worry about carrying weight.

I wish heavy wheels were more standardized for both heavy people and cargo bikes.

They will be. E-cargo bikes in particular have really jumped in popularity, and that will be followed by cargo-specific tires, wheels, and accessories.

But to circle back to the original article. Yes, weight limits and all relevant specs should always be listed and easily available. I personally hate having to dig through stuff to find something as important as torque specs for bolts, as an example.

Custom bikes are actually cheaper if you have like $50 worth of tools.