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Hi, currently working on a bike with 26” tyres, they are 1.75 inches wide, and the tubes come with them. It is being upgraded to 2.2 inches wide and I was wondering whether the tube would expand or if a new one would be required? Thanks.
 

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Tubes have a range of compatible tire widths printed on the box and often on the tubes themselves. If your tire fall is that range, you're golden. If it's outside of that range a small amount, you're OK too. A tube that's too big can get folded or creased in the tire which can cause a flat due to abrasion with itself. A tube that's too small will expand to fill the tire, but it will be stretched which can make it easier to puncture.
 

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Tubes have a range of compatible tire widths printed on the box and often on the tubes themselves. If your tire fall is that range, you're golden. If it's outside of that range a small amount, you're OK too. A tube that's too big can get folded or creased in the tire which can cause a flat due to abrasion with itself. A tube that's too small will expand to fill the tire, but it will be stretched which can make it easier to puncture.
Also, if you patch a tube that's meaningfully too small, your patch may have trouble staying on because the contact patch/glue will be extra stretched, increasing chance of separate between patch and tube.
 
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