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The rims on the DRT 1.1 are 19.5mm. Before going with a bigger tire, we recommend talking to your local bike technician to ensure your tire not only fits your rim correctly, but also fits the fork and frame of your bike. Fitting a new tire to your rim can be a surprisingly complex process, read this article in Bike Rumor to better understand why it's important to think through all the variables in your bike before making a purchase.
Hopefully this helps, thanks!
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