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How do you guys like to bias your tube sizes when border line.?

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How do you guys like to bias your tube sizes when border line.?

Old 03-27-18, 10:26 PM
  #1  
jsidney
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How do you guys like to bias your tube sizes when border line.?

The tires are 700 X 28.

The tubes I want to use are bracket this tire size.

(700 X 18-28c) VS (700 X 28-45c).

How do you guys decide which way to go when in the middle? I am thinking about going to 18-28c route but wanted to hear what others think.

Last edited by jsidney; 03-27-18 at 11:53 PM.
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Old 03-27-18, 11:46 PM
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I considered the same issue when I purchased my bike in 2015. Without doing any research I choose to start at the bottom with growing room so, 700 X 28-45c. I have had zero tire problems to date.
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Old 03-28-18, 12:01 AM
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I generally err on the side of a little small. Makes it easier to deal with the tube when inserting it into the tire.
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Old 03-28-18, 12:33 AM
  #4  
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Small. Easier to fit, lighter, not much in the way of drawbacks.
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Old 03-28-18, 01:02 AM
  #5  
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I go to the smaller size.
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Old 03-28-18, 08:51 AM
  #6  
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I go bigger under the theory that the rubber wouldn't be stretched as thin to fill the tire, thereby improving flat protection due to the slightly thicker tube. I could not possibly care less about the difference in weight.

I have absolutely no proof that my idea is even remotely effective.

-Kedosto
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Old 03-28-18, 10:57 AM
  #7  
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Deliberately smaller for ease of installation.
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Old 03-28-18, 11:18 AM
  #8  
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Originally Posted by SquidPuppet View Post
Deliberately smaller for ease of installation.
I'll bet you say that to all the girls.
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Old 03-28-18, 11:22 AM
  #9  
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larger, less stretch to fill casing = longer air retention.
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Old 03-28-18, 11:25 AM
  #10  
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In this case if your tubes go from 28-45 I would probably personally go with the smaller size as far as installing more easily and carrying around in a seatbag. @fietsbob makes a good point as well but generally with tubes with that much range they are more designed to be easier for wider sizes than the minimum stuff. They will work but can be hard to work with.
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Old 03-28-18, 12:11 PM
  #11  
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As long as the tube is new, as in never installed in a larger tire, I do what Bob does, for the same reason. As long as it hasn't been stretched larger, it will remain smaller!
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Old 03-28-18, 12:22 PM
  #12  
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Smaller.
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Old 03-28-18, 12:26 PM
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What hapeens if the tube is too big and bunches up?

Last edited by mtb_addict; 03-28-18 at 01:03 PM.
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Old 03-28-18, 12:50 PM
  #14  
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Originally Posted by indyfabz View Post
I'll bet you say that to all the girls.
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Originally Posted by chandltp View Post
There's no such thing as too far.. just lack of time
Originally Posted by noglider
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Old 03-28-18, 12:52 PM
  #15  
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I use these Continental Race 28 Training Tubes for everything from 25-32 which is 80% of my tires.
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Old 03-28-18, 06:02 PM
  #16  
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I use 18-25ís in my 32ís. Thereís *almost* no way you donít run into issues if you put something that fits a 45 into a 28.
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Old 03-28-18, 06:44 PM
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Originally Posted by kingston View Post
I use these Continental Race 28 Training Tubes for everything from 25-32 which is 80% of my tires.
+1 on Conti tubes. I usually stock up on those when we do our big Highway Two orders for the shop. I also occasionally will use QBP tubes or Specialized just to keep my stock up. I like the Conti tubes because they have a good range that I feel I can trust and I have used their tires a lot in the past and love them.
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Old 03-28-18, 07:10 PM
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Originally Posted by mtb_addict View Post
What hapeens if the tube is too big and bunches up?
Originally Posted by deapee View Post
I use 18-25ís in my 32ís. Thereís *almost* no way you donít run into issues if you put something that fits a 45 into a 28.
Post #2.
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Old 03-28-18, 07:45 PM
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Smaller, for less weight, both in the tires and in the flat kit. (also takes up less space)
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Old 03-29-18, 09:31 AM
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Originally Posted by mtb_addict View Post
What hapeens if the tube is too big and bunches up?
There are some tubes that I can use interchangeably between my 26"x1-3/8" bikes and 26"x1.75" bike. In the latter, an inflated tube can bunch up a little when installing, so I usually put less air in it first. Smoothing it out once it's inside the tire is no big deal.
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Old 03-29-18, 09:45 AM
  #21  
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Smaller.
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Old 03-29-18, 10:05 AM
  #22  
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Originally Posted by Wanderer View Post
As long as it hasn't been stretched larger, it will remain smaller!
That's what she said.
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Old 03-29-18, 03:05 PM
  #23  
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Count me in on the bigger size, for reasons.

I generally only have tubes that are 4-8mm range or so though, not that wide.
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Old 03-29-18, 03:18 PM
  #24  
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You really can go either way. Each has its pluses and minuses. @mtb_addict, if it bunches up, it bunches up, but it will still inflate. In theory, it could make the wheel imbalanced, but I haven't seen that happen in practice. I've even seen tubes of the wrong diameter used. It's not ideal, but it works.
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