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Old Jan 10th, 2007, 11:55 AM
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Rolling road test

Hi there everyone,

Not knowing exactly how a rolling road works, when a car is rolling road tested does the size of the wheels effect the bhp or torque reading as 17" wheels are heavier therefore harder to turn than the 15" standard wheels?
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Old Jan 12th, 2007, 04:35 PM
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tyre size does not effect power readings. our dyno measures wheel power and then transmission/tyre losses on the run down. these figures are added up to give flywheel power.
wide sticky tyres absorb more power but produce higher losses on run down, therefore the flywheel figure will be the same.

hope this helps

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