Get some 4-arm MTB cranks off ebay and Charlie the Bikemonger will sell you a 33t ring. Odd numbers are pretty hard to find in my experience.
http://www.charliethebikemonger.com/surly-104bcd-chainring-98-p.asp
I'm running 32:21 on some RaceFace XC cranks.
@Emyr started
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Get some 4-arm MTB cranks off ebay and Charlie the Bikemonger will sell you a 33t ring. Odd numbers are pretty hard to find in my experience.
http://www.charliethebikemonger.com/surly-104bcd-chainring-98-p.asp
I'm running 32:21 on some RaceFace XC cranks.