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umop3pisdn
@Crop
By 319 yes I mean the mavic 319.
For about a year I've been running a 23 up front and it's been fine.
The only reason for running a 20c is down to stupid clearance at the fork crown on a recently acquired frame.
From inspecting it post installation my main concern is based around running out of tread and cornering on sidewall when leant over.