What is a reasonable spec for radial runout or "out of round" for a good tire, properly installed on rims that are true?
I have Schwalbe Ultremo ZX on Zipp 101 wheels. The wheels are true and round, but if I spin the wheels, I can see a clear bump (~2mm in front, 1 mm in back) in the tire as it spins. (Doing the same eyeball test, with a mm scale ruler held by the wheel, the lateral and radial variation of the rim is under 1 mm, probably closer to 0.5)
I've had issues with vibration/shimmy on the bike (Cervelo R5). Truing the wheels helped, but on the last ride, I thought I could feel a sort of pulsing vibration on a descent. That's why I looked at the wheels/tires.
I've read about the issues with Schwalbes and I'm seriously thinking of going back to the old reliable, Continental 4000.
Can anyone shed light on what a reasonable expectation is for radial runout of a tire?