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Choosing inner tubes

Monica

Forum Supporter
Joined
Oct 4, 2009
Messages
411
Location
Texas
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/bridgestone/front-trail-wing-39-90-100p-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

Forum Supporter
Joined
Feb 15, 2013
Messages
404
Location
Graham, Texas
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/bridgestone/front-trail-wing-39-90-100p-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.
 
Joined
Aug 15, 2006
Messages
7,055
Location
Huntsville
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/bridgestone/front-trail-wing-39-90-100p-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

Forum Supporter
Joined
Oct 4, 2009
Messages
411
Location
Texas
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

Forum Supporter
Joined
Nov 26, 2009
Messages
55
Location
Greenville
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​
 
Joined
Jan 8, 2009
Messages
171
Location
Paradise
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

Joined
Aug 9, 2012
Messages
442
Location
austin
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

Forum Supporter
Joined
Oct 4, 2009
Messages
411
Location
Texas
Thanks dudes, I got my tubes ordered, also a couple tire spoons. Trying to be prepared for eventually.
 
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