Originally Posted by
Retro Grouch
They can be too long. At some point it gets more difficult to thread your pump chuck onto and especially off of a too long valve.
Those 20mm difference won't cause this unless the wheels aren't aligned with parallel spokes at the valve.
I'm guilty of this. I replaced a rim with something close, not exact. Didn't get any new spokes. Once built, the spokes were a touch too long. So I quickly turned it into a twisted spoke build without taking it all apart and trying to figure out how it all lines up. This wheel has a pretty tight valve clearance and has a twist just above the valve.
On 700c, still no big deal but if this were a bmx wheel or something, I might need a crack pipe to inflate it.