At 30-40 mph the wheels are spinning at a slower speed so depending on how bent the wheels are you may or not feel it. When they put the wheel on the balance machine can they spin the wheel slowly to see if it is bent? Most tire balance machine has a hood/cover that cover the tire so you will not be able to see the wheel spinning while they are balancing the wheel.

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2006 Infiniti G35
2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD
Lotus Europa 1970 Destroyed by fire
Lotus Europa 1970 S2 Renault Powered
Lotus Type 52 1970 Twincam Webers Powered
PORSCHE 911 Targa 1982 The Garage Queen
Audi Avant donated to Kars for Kids
BMW 525IT Sold
Audi 4000CS Quattro Sold
Jensen Healey Lotus Powered Sold
Opel 1900 Sold
Triumph Spitfire 1971 Sold
Triumph Spitfire 1968 Sold
Plymouth "Cuda" 340 Six pack SOLD