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Tube Size?

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Michelin used to recommend a 17CD tube, now they use a 400 18 trial tube. Do not use a 3.50/4.00 x 18 tube use a larger 4.00/5.10 x 18 tube the chamber for the tube in a trials tire is huge if compared to a 4.00 x 18 knobby

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Michelin used to recommend a 17CD tube, now they use a 400 18 trial tube. Do not use a 3.50/4.00 x 18 tube use a larger 4.00/5.10 x 18 tube the chamber for the tube in a trials tire is huge if compared to a 4.00 x 18 knobby

thank you, wasn't sure which one I needed

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