Originally Posted by Flimflam

Yeah I first thought I had a missized tube in there, but after the flat and fix on Sunday it's still the same, so I suspect the tyre itself. No big deal, I might try one last re-seat anyway.

The area where the 'bump' is more or less directly opposite the valve stem, I lined up the labels on the rim and tyre so I could visually identify this when riding, the labels being more or less the full 180 degrees from the valve stem.

Thanks.