No this would not be a problem because in order for the entire rim to catch fire it would have to have concentrated heat on one section. The sparks flying off would instantly burn themselves out.
The way sparks start fires in my business is only if the machinist does not clean his area and sparks land in a pile of light chips which causes a chain reaction. The thick mass of a magnesium wheel cannot be lit with anything except the long exposure from the flame of other magnesium.
As an example you can look up lowriders that throw sparks out...they most often use magnesium blocks mounted under the car to get such large sparks, but the spark is too brief to ignite anything on the car.
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We are the early orderers...we are GM's voluntary guinea pigs and their free source of feedback. How will we be thanked?
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