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31.6mm

Unless the new Aura’s are different, I’m pretty sure most Kleins(post Trek ownership) are 31.6mm. The 5 Kleins I’ve had all have had that diameter. If you haven’t assumed already…Thompson is the way to go. Check out e-bay or a big e-talor, if there are any other bikes that use that size seat post they are few and far between. You’ll find shops and retailers unloading the big Thompsons for cost, I just picked up a seat post for 35.00.
 
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