Which spare inner tube size to look for?

[Soliminal]

I'm trying to get a spare tube in case I run into a tire situation on the road. I see the front and rear tire dimensions are 80/90-17 (not really sure what that means though hah). I found the attached inner tube on Amazon but there aren't any reviews, would these be the correct size or should I look for something else? Should the tube match the tire size or be a bit bigger or smaller, I'm not really sure how it works. Thank you folks, any insight would be appreciate! Also if you have a preferred tube brand/manufacturer please let me know.

amazon.com/MOTORCYCLE-TIRE-TUBE-2-50-17-90-17/dp/B000WOCRQO/ref=sr_1_2?crid=154OIG5L09K47&keywords=80%2F90-17+inner+tube&qid=1661468098&sprefix=80%2F90-17+%2Caps%2C68&sr=8-2

 

[dmonkey]

That Amazon page is literally the same model tube as the OEM one that came in my 2021 Honda Trail 125, so that IRC #‎T20049 would be fine.

Personally I don't like that the OEM tubes are a mix of butyl and natural rubber, and instead run natural rubber (also called latex) tubes. Right now I'm running these: https://www.revzilla.com/motorcycle/bike-master-performance-motorcycle-tube?sku_id=1087209
Rubber cement doesn't adhere to butyl if you ever want to patch a tube. Natural rubber tubes are more flexible and more puncture resistant, BUT they are also more porous meaning that you need to check and air up your tires more often with them.
Don't sweat it either way though, tubes are a wear item and should be replaced each time the tire is replaced.

 

[Soliminal]

Thank you very much dmonkey! I'll get a pair of the bike master's you've got. I also didn't know to look out for the natural vs butyl rubber, and the pros/cons between each - Good to know. Thanks again!

 

[Kev250R]

Thank you very much dmonkey! I'll get a pair of the bike master's you've got. I also didn't know to look out for the natural vs butyl rubber, and the pros/cons between each - Good to know. Thanks again!

I'll be honest, I didn't know about the diffrences either. This explains why my Adventure bike looses air pressure at a faster rate then some of other bikes. Good info!

 

[Backwoods]

I just ordered two, as I have a set of 241s on the way. I like a new tube with a new tire and a quality made tube like this one dmonkey post a link for, thanks, you making it easy for me to get the right parts.

 

[Shoot870p]

And I continue to learn tips on these posts! Thanks for the info on tubes.