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Will my 17" tube work in/on a 18" wheel?

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Blue_SV650S
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PostPosted: 19:20 - 12 Feb 2010    Post subject: Will my 17" tube work in/on a 18" wheel? Reply with quote
I wanna carry a spare tube with me when 'laning ...

I have a 17" tube, but the rear on my bike is 18" ....

Now clearly these things are made of rubber so will stretch a bit hence thinking it'll do

But has anyone actually tried doing this??? Did you have any problems?? Thinking
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MarJay
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PostPosted: 19:27 - 12 Feb 2010    Post subject: Reply with quote
Won't work. It might fit around the rim but it won't inflate properly meaning yoiur tyre will just come off the rim.
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Imonster
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PostPosted: 19:28 - 12 Feb 2010    Post subject: Reply with quote
Never tried, but heard from the guys at Bikes of Brighton it's a bad idea - don't know why though..

That said, if it gets you home why not?

Though the last tube I bought from wemoto was only 6 quid - would be tempted to make the investment personally...
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.....
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PostPosted: 19:36 - 12 Feb 2010    Post subject: Reply with quote
Carry a 21" so it can be used in either the front or rear.
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The Shaggy D.A.
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PostPosted: 19:47 - 12 Feb 2010    Post subject: Re: Will my 17" tube work in/on a 18" wheel? Reply with quote
Blue_SV650S wrote:
I wanna carry a spare tube with me when 'laning ...

I have a 17" tube, but the rear on my bike is 18" ....

Now clearly these things are made of rubber so will stretch a bit hence thinking it'll do


The inside diameter of the tube is going to have to stretch 1.5" roughly - I wouldn't trust it, but it might handle a low PSI and get you home.
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Blue_SV650S
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PostPosted: 19:49 - 12 Feb 2010    Post subject: Reply with quote
Joe wrote:
Carry a 21" so it can be used in either the front or rear.


Is there not problems with doing that too!?!? Thinking

Imonster, if we are riding Sunday, I might get you to pick me one up when you go to wemoto tomorrow at £6ea! Wink
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Ste
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Joined: 01 Sep 2002
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PostPosted: 19:52 - 12 Feb 2010    Post subject: Reply with quote
Blue_SV650S wrote:
Joe wrote:
Carry a 21" so it can be used in either the front or rear.


Is there not problems with doing that too!?!? Thinking

Using a tube that's too big is less of a problem than using a tube that's too small.
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Blue_SV650S
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PostPosted: 19:59 - 12 Feb 2010    Post subject: Reply with quote
Ste wrote:

Using a tube that's too big is less of a problem than using a tube that's too small.



Why? ... especially where the 17" is only 1" too small and the 21" is 3" too large .... Thinking
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Imonster
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PostPosted: 20:12 - 12 Feb 2010    Post subject: Reply with quote
Blue_SV650S wrote:
Joe wrote:
Carry a 21" so it can be used in either the front or rear.


Is there not problems with doing that too!?!? Thinking

Imonster, if we are riding Sunday, I might get you to pick me one up when you go to wemoto tomorrow at £6ea! Wink


No worries! I'm there tomorrow morning and going out shortly for the evening, so let me know soon Thumbs Up
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MarJay
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PostPosted: 20:55 - 12 Feb 2010    Post subject: Reply with quote
Blue_SV650S wrote:
Ste wrote:

Using a tube that's too big is less of a problem than using a tube that's too small.



Why? ... especially where the 17" is only 1" too small and the 21" is 3" too large .... Thinking


Because 1" stretch is worse than 3" of slack... All that will happen is that a little bit of tube will fold over in the smaller rim. On the smaller tube it will stretch and it won't have a round cross section any more. It will be more like a sausage shape which won't actually hold the shape of the rear tyre at all.
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Blue_SV650S
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PostPosted: 21:02 - 12 Feb 2010    Post subject: Reply with quote
Cuban Pete wrote:


Because 1" stretch is worse than 3" of slack... All that will happen is that a little bit of tube will fold over in the smaller rim. On the smaller tube it will stretch and it won't have a round cross section any more. It will be more like a sausage shape which won't actually hold the shape of the rear tyre at all.


But I can't think that folding a tube up does it much good .... surely you are creating an area of high stress???

Whereas a 17" is just stretched uniformly round the whole circumference ... (and by a small amount (~6%) compared to when it is blown up/expanded).

I am happy to accept bigger is less of a problem than a smaller, but I am not sure anyone has actually provided a properly plausible/indisputable 'why' yet (to my mind)?!?! Neutral
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G
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Joined: 02 Feb 2002
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PostPosted: 23:47 - 12 Feb 2010    Post subject: Reply with quote
I can probably dig out a tube that needs a repair/has been repaired if you want one, not sure the next time I'll be out. Need money to get the 690 officially serviced Sad.
Have 18 and 21, but it's generally considered that 21 is the best choice.
Saying that, just rode 5 miles on the road with totally flat tyres, though I've got the tubliss system, so inner tubes aren't damaged more doing that.
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Blue_SV650S
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PostPosted: 09:34 - 13 Feb 2010    Post subject: Reply with quote
Princess Sunshine wrote:
I can probably dig out a tube that needs a repair/has been repaired if you want one, not sure the next time I'll be out. Need money to get the 690 officially serviced Sad.
Have 18 and 21, but it's generally considered that 21 is the best choice.
Saying that, just rode 5 miles on the road with totally flat tyres, though I've got the tubliss system, so inner tubes aren't damaged more doing that.


If it works, it works ... I have got Imonster to pick me up a 21" £6 job when he goes to the shop tomorrow! Thumbs Up I will use that front or rear in a 'get me home' manner if/when the time comes. So thanks the for offer of old tube, but shouldn't need one now! Karma

However, we still haven't really satisfactorily answered the original question/problem of WHY is way too big better than a little too small small {oooooerrrrr missus!} Thinking
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G
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PostPosted: 10:10 - 13 Feb 2010    Post subject: Reply with quote
It may be 'considered opinion' just because it means you only need one tube for both wheels - fitting a 17" on a 21" might be rather more hassle Smile.
However, I can see that a 17" on an 18" could maybe cause some heat issues if pumped up to any reasonable pressure as the rubber is going to be more stretched, whether that's worse than having doubled-up tube I don't know.
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Ed Case
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PostPosted: 19:54 - 13 Feb 2010    Post subject: Re: Will my 17" tube work in/on a 18" wheel? Reply with quote
Blue_SV650S wrote:
I wanna carry a spare tube with me when 'laning ...

I have a 17" tube, but the rear on my bike is 18" ....

Now clearly these things are made of rubber so will stretch a bit hence thinking it'll do

But has anyone actually tried doing this??? Did you have any problems?? Thinking


Donkeys years ago when I had hair and a glimpse of a bra strap excited me it was reckoned that as an emergency 'get you home' measure a next size up (17" to 18"for instance) was acceptable. Going down from say 18" to 17" was not because there was a danger on inflation of getting a 'fold' in the tube risking an abrading action which could cause a rapid deflation. The other point is that in the event of an accident caused by an incorrect inner tube fitted and failing your insurance should they find out could well be invalid. Fit the right size tube !.
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Blue_SV650S
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PostPosted: 17:16 - 06 Apr 2010    Post subject: Reply with quote
FYI, after advice in this thread, I got a 21" tube (thanks for getting it for me Imonster Thumbs Up).

Anyhoo, I got a puncture in my 18" rear at the weekend Crying or Very sad ... so to test out the 21" in the 18" tyre gag ...

I always thought it would be ok to 'get you out of trouble' ... but I had only just started out and had ~90miles of laning left ...

Anyway, just to let you know, not only would it 'get you home' - it will also take the abuse of ~90 miles of laning without popping Cool

Furthermore, I have now taken the tube out (wondering what mess would be left) and it is totally unaffected by the episode it would seem!! Shocked

So I can now convert the 'idea' into a tried and tested thumbs up for the 21" Thumbs Up

Oh and I have repaired the original 18" with a motorcycle repair kit (see link below) ... it has repaired the puncture - no problem - but I'll report back to let you know how it gets on with the abuse of 'laning!! Confused

https://www2.bikechatforums.com/viewtopic.php?t=194509

I got a repair kit as not only did I not want to throw a perfectly good tube away, but I intend to keep it in my kit-bag and hope that I can actually use that to repair a puncture when out (then I don't have to switch 21" tube back out when I get home).
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