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Mavic true UST 650b rim?

thejonfthejonf Posts: 28
edited December 2016 in MTB workshop & tech
Anyone know if mavic make a "proper" ust rim in 650b size? Couldn't find on their website. I've got 26" 819xm on current bike which are proper ust, i.e. No rimstrips., but researching next bike which will probably be 650b.
Anyone know or care to guess why they seem to think rim strips are better than a proper engineered sealed rim? Might be wrong but I figure a double wall rim is still lighter than an extra chunk of rubber?
Cheers

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