Can I use 27 x 7/8-1 inner tubes in a 27 x 1 1/4 bicycle tire?

Yes they will work 700 X 25-32c would be better. I would have spares on hand just in case.

27" is not the same as 700c. You could probably make it work as a temporary thing if you didn't have access to 27" tubes, but you will have more frequent failures.

Yes it will work. The buteyl (not sure of the spelling) that inner tubes are made of is a very stretchy material. It will fill the space with ease (we're only talking a very, very slight difference).

But what I do is cut the old inner tube length-wise on the inside and use it as a liner between the tire and the new tube. Inflate the new tube just enough to make it round, tuck it inside the old tube/liner,and tuck the whole thing inside the tire (slips right in). Next start with the valve and work the whole thing onto the rim (goes on pretty easily).

The liner will take up the gap and give much more thorn resistance.

Don't do it. You are pushing it too much. First the material must not be that stretchy as it is intended for 7/8" to 1", only 1/8" range.

You are trying to install it in a range that is 200-300% larger than the intended range of 1/8". 1 1/4"-7/8" = 3/8" The 1/4" difference in width is at the diameter of the tire's balloon. Multiply that X PI (3.1416) to get the circumference to what the tube will have to expand above the original 1" diameter.

Yes, increasing the diameter by 1/4" increases the circumference by ~0.8". From =Find a a tube that includes 30 on the range. 25-30 or 28-32.

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