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Inner Tube

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 What inner tube is recommended for rear fitment with a radial tire? I used to get a Michelin tube marked as Special Trials 4.00R18, but I can't find them anymore.

Using Metzler when I remember right and one the other there must be a Pirelli to the Michelin. Not sure what is mounted to the Smilla ... have forgotten ... does it really matter never came to this question so far.

Another point when doing Motoalpinismo in the Alpes I have 19" inner tube with me to fit front and rear tire. In case of and this size fit's both wheels.

That inner tire is from Metzler too if this helps?

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