Old 12-05-19, 02:30 PM
  #6  
mstateglfr 
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Join Date: Aug 2014
Location: Des Moines, IA
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Bikes: '18 class built steel roadbike, '19 Fairlight Secan, '88 Schwinn Premis , Black Mountain Cycles Monstercross V4, '89 Novara Trionfo

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I think my rims are 19mm internal. My old ones were 17.5mm and they handled a true 40mm tire perfectly fine.

A modern rim thats 23mm - 25mm external will be good.
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