25mm tube in 28mm tyre yes/no ?

[Dave7]

New bike with 28mm tyres......forgot to buy a spare tube.
I have a 25mm tube
Googled it and got lots of opinions but no actual facts.
One one hand it seems reasonable but on the other hand the fact that they make specific sizes says its wrong.

 

[roubaixtuesday]

Yes.

 

[ianrauk]

Yes

 

[OldShep]

Yes

 

[Cycleops]

Oh dear, don't know about that. 😊

 

[Milkfloat]

Yes, think how much weight you are saving.

 

[Kestevan]

Nah, will most assuredly result in the end of the world as we know it...

Fire, brimstone plagues etc...in fact Covid-19 is a direct consequence of someone fitting a 23mm inner tube into a 25mm tyre back in February.

 

[Racing roadkill]

Yes.

 

[Smudge]

Wouldn't worry me in the slightest using a tube of a slightly less size than the tyres. 3mm is no big deal.

 

[DCBassman]

Yes

 

[Dogtrousers]

No! Definitely not!

Only kidding.

Yes

 

[Smokin Joe]

Yes, provided you fit the tyre the right way round.

 

[Drago]

Won't somebody think of the children!

 

[Cycleops]

You might remember the issues being well documented in that film "A three millimetres too far".

 

[Ajax Bay]

28mm tyres

Yes - but anyway share what make/model tyres these are (assume 622-28) and what pressure you're going to run them at and what the rims are.