mikem1alt

What are the correct tubes for French-made Rigida chromace superchromix marked 27 x 1 1/4 with a tiny 40 mark as well?
they seem quite narrow 700 x25/32c tube is wrong I had some to try

Rolla

700 X 32 or 35 should fit.

ClydeClydeson

What was the problem with the 700C tube? Generally a tube labelled for one will easily fit the other. I have never seen it not work.

The difference between a 700x32c and 27x1-1/4 is 4mm of rim diameter - less than the width of a finger - and inner tubes are very flexible and stretchy.

mikem1alt

the tube was very loose and in my opinion to big

Iride01 

Too big? You didn't inflate it somewhat at first did you?

Still, you need to explain how we are supposed to interpret big. Too big in over all diameter? Or too big in the cross-section diameter?

mikem1alt

the tube sits over the rim by about 4mm so cross diameter, and there is quite a bit of slack all the way around so the tube does not sit flush in the wheel

Iride01 

The important thing is the major outside diameter of the tube not be bigger than the space inside the tire that it has to fill, otherwise there might be wrinkles that will only be future flats.

When it's enclosed by the tire and rim, it'll expand to fill up what it needs to fill. Whether that is between the tube and tire or tube and rim is somewhat no big deal.

If you don't feel the tube is right for your rim and tire, then get another brand. Different tube makers have different ways sizing their tubes for tires.

I wouldn't let it keep me from riding. I'd fill it up and get out there riding instead of procrastinating. In fact I'm going to put mix in my bottles change clothes and go right now.

sovende

I have a New In Box 700c (28-43) tube and the labeling on the box also states that it will fit 27”x (1 1/8, 1 1/4 & 1 3/8) tires. The labeling on 700c (25-32) tube boxes make no such claim but I do agree with those that say the tube you have will be fine. It is unlikely the tube is “too big” and if anything, inflating it in a 27” x 1 1/4” tire MIGHT make the tube somewhat thinner.
Might I suggest a method that seems to work well for me. First, I deflate the tube as much as possible and be sure to reinstall the valve cap. Place the tube in a plastic shopping bag (no holes), add some baby powder (talc, corn starch or similar), close up the bag and shake it to coat the tube with the powder. This provides some lubrication between the tube and the inside of the tire when inflating and tends to minimize kinks and/or folds. Sometimes I also sprinkle powder into the tire too. Add a small amount or air to the tube (just enough to give it shape) then place it in the tire. When mounting the tire to the rim some air will likely need to be let out of the tube to facilitate getting the tire bead to go over the rim. The powder “lube” will allow you to adjust the valve so it is pointing directly at the wheel hub.
BTW, the “40” marking on the rim may be the number of spoke holes? That would make it a “touring” wheel.

Trakhak

You haven't installed a tube before, apparently. Inflate the tube (before installing it in the tire) with a few strokes of the pump, just enough so the tube is no longer flat. The tube will then apparently shrink in circumference---a consequence of toroidal geometry.

Better still, since you're undoubtedly still skeptical, take the tube, tire, and wheel to a bike shop and pay to have the tube and tire installed on the wheel (while you watch). The mechanic will confirm that you have the correct tube for your tire and rim.

Bicycle...and D

I've got the same wheels on my Motobecane, but here in the states I have no problem getting regular 27X1¼ tubes.

Ironfish653

This.

The tube goes up into the tire, which is then seated into the rim.
I mean, it’s a little more nuanced than that, but it seems like OP is trying to fit the tube into the rim groove, and then somehow put the tire on top?​​​​​