Just bought some Conti Flows, these are 2.3 light weight jobbies but I have just discovered I only have 2.1 tubes ( a spare 7 or 8 of the buggers to be precise)

There seems to be little choice on the big web sites re 2.3 tubes, can anyone recommend a good light weight 2.3 tube.

Failing that what would happen if I simply used the 2.1 tubes ? Its not as if I am stretching them a big amount and they are rubber after all.

I have used Nokian Uni tubes which will go from 1.95 to 2.3.
You will be able to use the tubes you have but they'll puncture more easily (especially with Conti lightweights).

I now run fat tyres tubeless with a Stans kit and bit of latex sealant.

Yes, just a bit more prone to punctures.

We're talking two tenths of an inch difference you'd be hard pushed to see the difference really course they'll work

Conti 2.3's are 2.1's really so thats perfect.

Been thinking about those tyres to, any good ??? I'd bet Zero use if you find a patch of mud though ??

Dylan they look good, they are so light with what appear to be paper thin side walls that I fear puncture city might be a common stopping point but as always there is only one way to find out, will update you after the weekend.

Was going to slap one on the back of the HT to remove the Drag from the rear haven't got around to ordering 1 yet though.

Will await your review :)