If you have a frame, you can measure it with vernier callipers (schuifmaat). If the tube inner diameter is a bit too small, you can use an adjustable reamer without any harm. Removing 0.1 - 0.2 mm or so must be no problem.
@Dutch_Cheese started
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If you have a frame, you can measure it with vernier callipers (schuifmaat).
If the tube inner diameter is a bit too small, you can use an adjustable reamer without any harm. Removing 0.1 - 0.2 mm or so must be no problem.