28mm innertube into a 25mm tyre ?

[gbb]

As the title says....
Somehow ive ended up with a Continental 28mm innertube .

Any issues with putting it into a 25mm tyre ? Will its larger diameter allow me to get sufficient pressure into it, within a smaller tyre ?.

Any thoughts appreciated.

 

[Landslide]

I reckon you'll be fine. It's the tyre that limits the pressure - you could easily inflate a 23c tube to a greater diameter than a 23c tyre.

 

[jimboalee]

Think about it.
A 28mm inner in a 25mm outer won't stretch as much as a smaller tube.

http://www.ribblecycles.co.uk/productdetail.asp?productcatalogue=CONTTUBE400

Read and smile.

 

[gbb]

Hmmm...i see the 28 Race does 18/25...but mines 28 Tour, for 38/37

No matter, i'll try it and see.

Thanks for the input all

 

[maurice]

You may get a bulge in the tyre, had it with MTB tubes being too big for the tyre.

 

[tyred]

You may get a bulge in the tyre, had it with MTB tubes being too big for the tyre.

You must surely have had a damaged/weak point on the tyre.

 

[maurice]

Tyre looked fine to me. With a tube specified for it's width range it doesn't bulge.

 

[Steve Austin]

if its meant for a 38/37 (i guess you mean 28/37) and you pump it up to a decent pressure it will blow the tyre off the rim. It will make a loud bang and it can wreck the tyre and the rim. Get the correct size and use that.
I've used the wrong size to get me home, but i wouldn't use it for everyday riding

 

[gbb]

if its meant for a 38/37 (i guess you mean 28/37) and you pump it up to a decent pressure it will blow the tyre off the rim. It will make a loud bang and it can wreck the tyre and the rim. Get the correct size and use that.
I've used the wrong size to get me home, but i wouldn't use it for everyday riding

Deep down, thats what is worrying me. Think i'll not bother then. Keep it for one of the hybrids

 

[andrew_s]

If the tube is too big for the tyre, you get the following possible problems:
a) It makes fitting the tyre more difficult
It's easy to get part of the tube trapped between the rim and the tyre bead. This will be why the tyre can get blown off. It's not because a bigger tube puts more pressure on the tyre or anything.
c) You can get a crease in the tube inside the tyre, which may eventually rub through against the tyre and cause a puncture.

So, not ideal, but if it's on and in use there's not much reason to take it off.

If it's a 28-37 tube, it's 28 more or less unstretched, and not much bigger than the 25mm tyre. Problem (a) is the only one that's really likely.