700c x 25 Tube Question
08-26-23, 01:30 PM
#1
Junior Member
Thread Starter
Join Date: Aug 2021
Location: Southwest Florida
Posts: 77
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 41 Post(s)
Liked 26 Times
in
14 Posts
700c x 25 Tube Question
I have 700c x 25 tires in my older model Bianchi Giro.
When shopping for tubes online I see tubes sized 20-25 and 25-32.
It would seem the 20-25 would be lighter and easier to mount but am I missing something?
Is there an advantage and/ or disadvantage between the two?
These are labeled Continental Race.
Your thoughts?
Thanks
When shopping for tubes online I see tubes sized 20-25 and 25-32.
It would seem the 20-25 would be lighter and easier to mount but am I missing something?
Is there an advantage and/ or disadvantage between the two?
These are labeled Continental Race.
Your thoughts?
Thanks
08-26-23, 01:57 PM
#2
Senior Member
Join Date: May 2003
Location: Mountain Brook. AL
Posts: 4,002
Mentioned: 14 Post(s)
Tagged: 0 Thread(s)
Quoted: 303 Post(s)
Likes: 0
Liked 136 Times
in
104 Posts
The 20/25 tube will start with a smaller diameter, which when inflated will stretch the tube more. If the tube
has any imperfection/scratch/thin area then that will provide a potential trouble area. The 20/25 tube will be
easier to install and lighter as you note. The risk of potential trouble area is low, but not insignificant. A patch
on the smaller tube will result in more distortion of the tube in the larger tire, again mostly insignificant.
Stuffing a 25/32 tube in some tires (especially those that are hard to mount anyway) can be a challenge.
has any imperfection/scratch/thin area then that will provide a potential trouble area. The 20/25 tube will be
easier to install and lighter as you note. The risk of potential trouble area is low, but not insignificant. A patch
on the smaller tube will result in more distortion of the tube in the larger tire, again mostly insignificant.
Stuffing a 25/32 tube in some tires (especially those that are hard to mount anyway) can be a challenge.
Likes For sch:
08-26-23, 02:15 PM
#3
Junior Member
Thread Starter
Join Date: Aug 2021
Location: Southwest Florida
Posts: 77
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 41 Post(s)
Liked 26 Times
in
14 Posts
The 20/25 tube will start with a smaller diameter, which when inflated will stretch the tube more. If the tube
has any imperfection/scratch/thin area then that will provide a potential trouble area. The 20/25 tube will be
easier to install and lighter as you note. The risk of potential trouble area is low, but not insignificant. A patch
on the smaller tube will result in more distortion of the tube in the larger tire, again mostly insignificant.
Stuffing a 25/32 tube in some tires (especially those that are hard to mount anyway) can be a challenge.
has any imperfection/scratch/thin area then that will provide a potential trouble area. The 20/25 tube will be
easier to install and lighter as you note. The risk of potential trouble area is low, but not insignificant. A patch
on the smaller tube will result in more distortion of the tube in the larger tire, again mostly insignificant.
Stuffing a 25/32 tube in some tires (especially those that are hard to mount anyway) can be a challenge.
08-26-23, 06:32 PM
#4
Senior Member
Join Date: Apr 2009
Location: New Rochelle, NY
Posts: 38,725
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Mentioned: 140 Post(s)
Tagged: 1 Thread(s)
Quoted: 5793 Post(s)
Liked 2,584 Times
in
1,432 Posts
You're on the fence and could opt for either. Your best choice would depend on the details.
The first and most important depends on reality vs. markings. Since tubes are basically butyl balloons, there's plenty of stretch, so there's plenty of latitude of actual size among different brands marked the same.
IMO, you want the flat width to be equal to or slightly greater than the tires width. This allows some expansion when inflated without being stretched thin. I prefer this because it allows the tube to expand down into the rim space without overstretched, which happens with narrow rims.
The first and most important depends on reality vs. markings. Since tubes are basically butyl balloons, there's plenty of stretch, so there's plenty of latitude of actual size among different brands marked the same.
IMO, you want the flat width to be equal to or slightly greater than the tires width. This allows some expansion when inflated without being stretched thin. I prefer this because it allows the tube to expand down into the rim space without overstretched, which happens with narrow rims.
__________________
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
Likes For FBinNY:
08-26-23, 06:39 PM
#5
Really Old Senior Member
Different makers will give a lot of sizing options.
Example a 23-25mm which would be my choice, everything else being equal. (which may or not)
https://www.amazon.com/Kenda-Super-7...s%2C151&sr=8-7
Example a 23-25mm which would be my choice, everything else being equal. (which may or not)
https://www.amazon.com/Kenda-Super-7...s%2C151&sr=8-7
Likes For Bill Kapaun:
