I've faced a strange issue with inner rear tube. It is Schwalbe Little Big Ben tyres 700x38C and Schwalbe tubes. After 20km (12.5 miles) riding tube was abraded by tyre at opposite side of valve. It happened two times before I shifted to Maxxis but the same happened again with the Maxxis tyre. I do not have this problem with the front wheel. With red marked places of abrasion. Little Big Ben it is special high profile tire acting as vibration damper named Baloon Type. Could be tire too big for the tube? May be I have to inflate more?..Anyway it is strange... Has anybody dealt with something like this?
I see three possible locations on the tube that could match your description.
- On the outside (rolling face) and 38mm across the inflated tube from the valve.
- On the outside, but 180 degrees away from the valve (so the opposite edge of the wheel)
- On the outside, but 180 degrees away from the valve (so the opposite edge of the wheel) BUT on the inside edge of the tube that faces toward your hub.
I think this is what you mean.
The first two are the same - there is something in the area that is causing your abrasion. Like a small wire or glass shard that is wedged deeply in the rubber of the tyre and you can't see it by casual inspection. Need to flex the tyre inside-out and look carefully. You can also use the hole in the tyre as a measure around from the valve to see where the damage came from... that will put you within 50mm of the spot. However changing the tyre would have resolved that.
The third option is the most likely. Something on your RIM is causing the issue, so changing the tyre did nothing. Look closely at the rim tape, make sure its laying flat in the channel and that there are no parts of the nipples exposed. Also that no part of a nipple hole is left uncovered. These can frett away at your tube over time. Even paper labels or sand or small rocks can winnow their way through your tube if they are inside the tyre. Some brands of tyre liners can also eat it at the ends of the liner, but these are normally on the outside circumference only and you probably don't have liners anyway.
The fix for this is to replace your rim tape - its cheap stuff, just make sure the replacement is as wide as your existing tape, or slightly wider but not enough to ride up the inside where the tyre bead hooks are. Fouling the bead hooks risks a blowoff.
There's a minor chance this is an installation error where you've scraped the tube with a tyre lever while installing, but that's not as likely.
If none of this helps, do please add some clear and well lit photos of your tube damage, and the area of the rim causing the problem.
We are missing some information in the question (the size of tube and inflation pressure). But to me that looks like a tube that is too small and/or under-inflated that is able to move/rub against the inside of the tyre. The pattern of the abrasions look exactly like the threads of a high volume tyre.