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The size of the tube is usually written on the box. Tubes stretch a bit so they fit a variety of sizes. For a 27 x 1 1/4 tire you would need one that says 700x32 which is the equivalent new size of tube, although both the old system and new system are usually written on the packaging. This size is very common and you should be able to purchase the tube at ...

You may or may not be able to make that conversion with your existing brake/frame combination. Your brakes will have to reach farther because a 700c wheel is a smidge smaller than a 27 inch wheel. Depending on your setup, that may be possible. I'd recommend borrowing a 700c wheelset from someone to see if you can line it all up. If it all lines up, great. ...

Yep, a standard 700C tube will fit a 27" tire (and most tube boxes bear multiple markings to indicate this). Just convert the inch width to mm to get the width of the 700C tube, if the box doesn't say the inch size. Tires, of course, are a different matter -- there is enough difference in rim diameters between 27" and 700C tires (which don't stretch like ...

The difference between 700C and 27" is pretty small. The rims are 622mm and 630mm so the actual change in brake shoe position is 4mm (less than 1/4"). Look at your brakes and decide whether they will suit. You may be able to change the brakes to ones with longer arms (assuming caliper types). Another issue may be the rear hub as these have got wider over ...