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my road bike got a puncture in the front wheel yesterday while I was riding down a big slope, it happened when I was braking the bike then I heard a pop. I stopped and replaced with a new tube, resumed riding, and another pop when I was down a small slope, I remember I braked a bit as well. Two punctures appeared to be near the valve. two punctures near valve

I found a hole in the tire, could it be the cause of two consecutive punctures? enter image description here

Also found that side of the wire has a lot wear enter image description here

while the other side of the wire has no wear at all enter image description here

I checked the rim and its tape, didn't find any obvious spike or anything.

Question 1: do I need to replace the tire?

Question 2: what causes the wear on one side of the tire?

update: just found out the second tube I replaced, is a 650/18-25c tube, my rim is 700...

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    Looks to me like your brake pad may be rubbing the tire on one side and needs adjusting. Also always make sure you check your tire as well when changing a flat. A good method is to run your hand around the inside diameter of the whole tire. That way a sneaky thorn doesn't stay behind and pop your newly replaced tube.
    – Nate W
    Commented Mar 14, 2016 at 16:53

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It seems that brake pad is touching your tire on the one side. Make it parallel to rim and/or move it a little bit down, if you don't same thing will happen to your new tire! Park tool manual example (via http://www.parktool.com/blog/repair-help/linear-pull-brake-service)

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  • thanks mocniak, as checked, the left front brake pad was bit high
    – Chris Chen
    Commented Mar 21, 2016 at 22:06
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I would replace the tyre even if it's not the cause of the puncture as the bead is coming away. I'd do it reasonably quickly but I would take the risk of riding home or to the bike shop on it.

Do you know if this bit of the tyre was anywhere near the punctures? I put the manufacturer's logo next to the valve when I fit a tyre to make working this out easier.

By the way, tubes can take a lot of stretch. I've seen a 24" tube survive on a 26" wheel.

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  • You should probably also check over the rim in case one side is rough/damaged/rusty. Do you always park the bike in the same orientation relative to the prevailing weather?
    – Chris H
    Commented Mar 14, 2016 at 8:48

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