20-25 tubes in 28mm tires??

General cycling advice ( NOT technical ! )
boris
Posts: 411
Joined: 5 Nov 2010, 1:58pm

Re: 20-25 tubes in 28mm tires??

Postby boris » 29 Jan 2019, 5:56pm

I have used '18 to 25' tubes up to 32mm tyres and conti race 28-32 tubes in 37mm tyre and 26 inch tubes in 700c tyres countless times over the years and although I cannot guarantee it I have never had any problem. After a while you forget what tube is in. After stretching I suppose the tube is effectively thinner but I never had one rip.


Conti tubes' rim nut has a little lip on one side so that presta tubes can be used in schrader holes. I try to keep one on my keyring.

Mike_Ayling
Posts: 85
Joined: 25 Sep 2017, 3:02am
Location: Melbourne Australia

Re: 20-25 tubes in 28mm tires??

Postby Mike_Ayling » 29 Jan 2019, 9:08pm

boris wrote:I have used '18 to 25' tubes up to 32mm tyres and conti race 28-32 tubes in 37mm tyre and 26 inch tubes in 700c tyres countless times over the years and although I cannot guarantee it I have never had any problem. After a while you forget what tube is in. After stretching I suppose the tube is effectively thinner but I never had one rip.




I have done the same with 21-23 tubes in 28 tyres for many years without any noticable problems

Mike

Brucey
Posts: 32321
Joined: 4 Jan 2012, 6:25pm

Re: 20-25 tubes in 28mm tires??

Postby Brucey » 29 Jan 2019, 9:51pm

I used to use as small and as lightweight tubes as I thought I could get away with. For about twenty years I would have been able to claim 'very few problems' but there is no doubt in my mind that -if you have a choice- less stretched tubes are a better idea.

cheers
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atoz
Posts: 311
Joined: 5 Jan 2007, 4:50pm

Re: 20-25 tubes in 28mm tires??

Postby atoz » 4 Feb 2019, 12:16pm

I would think - depends on manufacturer of tube and tyre. I generally use the Michelin A2 tube as it does 25-32. You can squeeze these into some 23c covers with care, but not with some rims- done it for years but at your own risk. The Schwalbe equivalent goes up to 28 but is a better match if you're likely to be still using 23s (and not many of us use 23s now). I find the A1 size is more prone to damage when putting new tyres on.

I prefer it when the tube valve stems have no threads as track pump connector head washers last longer that way- unfortunately most manufacturers supply tubes with threaded valve stems.