Choosing inner tubes

[Monica]

I'm putting together my tool/repair kit for the bike. I'm inner tube shopping and need some help.

Current tires:
Front: Trailwing 39 size 90/100-19
Rear: Trailwing 40 size 120/90-16

Do I need to pick the size of the rim only? Or do I have to consider the width too?

Ex: the specs on https://www.denniskirk.com/bridgest...90-100p-19-tire-142689.p651745.prd/651745.sku compared to the linked Kenda tube which I assume would correspond with it? https://www.denniskirk.com/kenda/economical-19-in-inner-tube-69105278.p53248.prd/53248.sku
What confuses me is the tire says 3.80" wide but the tube says fits 3.25/3.50" tires. Would that make that tube a no go for that tire? I'm having trouble finding tubes in my tire sizes when I use the pull down menus websites too. Am I making it harder than it is? Could use some guidance please.

 

[JQ1.0]

I'm putting together my tool/repair kit for the bike. I'm inner tube shopping and need some help.

Current tires:
Front: Trailwing 39 size 90/100-19
Rear: Trailwing 40 size 120/90-16

Do I need to pick the size of the rim only? Or do I have to consider the width too?

Ex: the specs on https://www.denniskirk.com/bridgest...90-100p-19-tire-142689.p651745.prd/651745.sku compared to the linked Kenda tube which I assume would correspond with it? https://www.denniskirk.com/kenda/economical-19-in-inner-tube-69105278.p53248.prd/53248.sku
What confuses me is the tire says 3.80" wide but the tube says fits 3.25/3.50" tires. Would that make that tube a no go for that tire? I'm having trouble finding tubes in my tire sizes when I use the pull down menus websites too. Am I making it harder than it is? Could use some guidance please.

3.25/3.50 will be fine in that tire. The 3.8" width would be inflated width at the widest point of the tire which will be a little more than tread width. The internal width will be something less than 3.8. The 90/100 metric = 3.54"/3.54" so 3.25" to 3.5" works.

 

[woodsguy]

I'm putting together my tool/repair kit for the bike. I'm inner tube shopping and need some help.

Current tires:
Front: Trailwing 39 size 90/100-19
Rear: Trailwing 40 size 120/90-16

Do I need to pick the size of the rim only? Or do I have to consider the width too?

Ex: the specs on https://www.denniskirk.com/bridgest...90-100p-19-tire-142689.p651745.prd/651745.sku compared to the linked Kenda tube which I assume would correspond with it? https://www.denniskirk.com/kenda/economical-19-in-inner-tube-69105278.p53248.prd/53248.sku
What confuses me is the tire says 3.80" wide but the tube says fits 3.25/3.50" tires. Would that make that tube a no go for that tire? I'm having trouble finding tubes in my tire sizes when I use the pull down menus websites too. Am I making it harder than it is? Could use some guidance please.

good question

 

[Monica]

3.25/3.50 will be fine in that tire. The 3.8" width would be inflated width at the widest point of the tire which will be a little more than tread width. The internal width will be something less than 3.8. The 90/100 metric = 3.54"/3.54" so 3.25" to 3.5" works.

Ok I see. Thank you.

 

[WFO75080]

Pick your rim size Ex: 16, 17, 18, etc. the rest isn't important. Tire size can be VERY important depending on how Particular you are about handling. Lower profile usually means a larger footprint. Taller sidewall gives you a little more play in the tire and a thinner profile.

Motorcycle Knobby Tire Size Conversion Chart
Front Tires​	Rear Tires​
Metric​	Metric​	Inch​	Metric​	Metric​	Inch​
60/100​	90/80​	2.50/2.75​	80/100​	80/90​	2.50/3.60​
70/100​	90/90​	2.75/3.00​	90/100​	110/90​	3.60/4.10​
80/100​	100/80​	3.00/3.25​	100/100​	120/80​	4.00/4.10​
​	110/100​	130/80​	4.00/4.50​
120/100​	140/80​	5.00/5.10​

 

[c_m_shooter]

I only carry a spare front tube on the road or trail. They will stretch to fill a rear tire when you air up. A rear tube will not stretch around the front rim to mount the tire without getting pinched.

 

[Dao]

In addition to the "SIZE", there's a couple things to also consider.

1. Material: Rubber vs. butyl (synthetic)
2. Thickness : standard=2mil heavy duty=3mil or ultra heavy duty=4mil

 

[Monica]

Thanks dudes, I got my tubes ordered, also a couple tire spoons. Trying to be prepared for eventually.