You’ve got a pretty standard road bike that comes stock with 25mm tires. The rims are less of a concern than the frame/fork/brake caliper clearance. I’d be surprised if you fit larger than a 28mm tire on there, maybe a 30mm if you’re okay with some rub (which you shouldn’t be okay with).

Don’t bother getting new rims/wheels for this bike, it won’t change clearance issues (and the 200+ price of any decent wheelset is gonna be a lot better toward a new ride). Try finding some 28mm gravel-style tires, or a different bike.

I’m not gonna let the intruder in my home (who keeps hitting me) stay there because I refuse to break my lamp over his head.

Russians in Ukraine is a much larger threat than less shrubbery.

Based off all that, I’d run the 18-32. Besides, assuming you’re not buying in bulk, and you’re not doing rural bike-packing, then getting a flat or other mechanical won’t be too catastrophic or costly. Try em out a lil, and report back on how you like them :)

I usually recommend people run the larger size tube. If it’s not too big to install, then it will stretch less and be slightly more puncture resistant.

However, why are you getting into TPU? If it’s for weight or rolling resistance, then definitely run the smaller tube.

I don’t like using tubes on the end of their spectrum; just bc the box says it’ll fit, doesn’t mean it always will. Surely there’s another brand of tubes with a better size range? That’s my best answer tbh.

(Are tpu extra stretchy? 18-32 is a crazy range by butyl standards)

Zyn is growing quick in popularity. Them and other nicotine pouches very well may be taking some of the market.

No body really confidently said. Yes, the direction matters, the arrow should point in the forward direction, if situated at the top of the tire. If there is a front/rear labeling, their respective arrows differ based on being mounted on the front or rear wheel.

That said, if you’re not an avid cyclist, you’ll likely not notice incorrect mounting. I wanted to find a lil something to help me better explain, but this post goes into pretty much all major aspects of tire direction all by itself. Here on MTBR