Funny tyre size

[jh787]

Hello everybody.
First post, so apologies if this is in the wrong section.

I have recently bought a bike (second hand) and am loving it to bits.

The gentlemen i bought it from told me that he had changed the tyres from original.

The bike is a Roux 2300.

The tyres are 700x33 and made by Maxxis.
I have bought some spare inner tubes but they state that they are for tyres up to 28c.

i cant find any info on whether these tubes are OK for these tyres and i don't want to be stuck out on the road with a spare inner tube that wont fit.

Any help would be appreciated

 

[Tim Hall]

Iner tubes normally cover a range of sizes. Schwalbe, for example do a 28mm-32mm tube and a 28-42mm. Another example, grabbed from the Wiggle website has one from Lifeline with a range of 28mm-35mm.

I'm sure your 28mm tube will be fine, but if it really bugs you the 28-32mm from Schwalbe or the 28mm-35mm will both be good. The 28mm-42mm might be a bit of a handful to squeeze into a 33mm tyre.

 

[jh787]

Thanks.
I thought they would be fine.
Just needed a confirmation from a pro

 

[Andy_R]

Thanks.
I thought they would be fine.
Just needed a confirmation from a pro

So why ask us muppets?

 

[jh787]

I'm a bigger Muppet..

 

[dddd]

Unless it's a race bike, I prefer to fit the largest tube that will fit in the tyre when the tube is inflated with just enough air in it to hold it's round shape.

This does not correlate well to the printed-on size of the tube, and different brands of tubes so often seem to list widely-varying numbers on the same width of tube.

So I do a test fit in the tire, and usually end up using a printed size tube that is 5-8mm wider than the printed size on the tyre.

The reason I do this is that the tube will thus not have to stretch much at all, only to bulge into the rim cavity, so that small punctures lose air very much more slowly and so often give enough time to arrive home before making the repair.