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18mm internal (These ) - Veloflex indicate their tyres work as per the ETRTO chart, so the 28s should go up to 19 internal. My impression is that the tube might bunch up inside as they feel incredibly snug - this was with bigger tubes for 28-32mm tyres, so maybe downsizing tubes for 20-25 range might help? 🤔
@miro_o did a lol 😂
alex_s
miro_o
What rims are these on? I have 28 and 25mm Corsas on 17 and 15 internal rims and had no issues so far.