# Car Wheel Temp: Brake Rotor & Hub Heat Range

• Automotive
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In summary, the discussion focused on the temperature range experienced by the wheel hub due to heat transfer from the brake rotor. It was noted that under track conditions, the rim hub can get fairly hot, but it will be lower in temperature compared to the rotor hub. The exact temperature will depend on various factors such as aerodynamics, mass and shape of the rim, and frequency of heat output. The conversation also mentioned the use of cooling fans and ducts in race cars to prevent excessive heat buildup. The typical temperature for street cars was also mentioned, with the brake pad manufacturers planning for temperatures up to 300 degrees Celsius.

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Considering how hot brake rotors get under hard street and race track braking, what is the typical heat range experienced buy the actual wheel in contact with the rotor and hub?

are you asking how hot the rim hub gets due to heat transfer? its a big heatsink, but under track conditions the rim hub can get fairly hot.

Physics_Kid said:
are you asking how hot the rim hub gets due to heat transfer? its a big heatsink, but under track conditions the rim hub can get fairly hot.
Yes , exactly. Due to hear transfer from rotor, and hub assembly, what temperature range does the face of the wheel encounter?

hard to say exactly what temp it will get to, all depends on aerodynamics, mass and shape of the rim, speeds at which wheel is moving, frequency of heat output, amount of heat generated, etc etc. if i drive w/o ever hitting the brakes, rim will be at ambient. but if i go 40-100mph and 100-40mph every 60 sec then the rim will get very hot.

i guess all i can say is, rim will be lower in temp then rotor hub. if you are looking for equations then it will be a heatsink problem with complex functions because you'll need to model the heatsink (rim) properly, which has many variables.

you watch tonight when 3000 pound plus NASCAR racers run the worlds fastest 1/2 mile bull ring. Right front brake rotors go excess 1400 to 1500 degree F for 500 miles. The wheel gets super hot as does the tire beads. Multiple air cooling fans and cooling ducts are used. You will see the rotors glow red during the race.
Street car typical temps are as the brake pad manufacturers plan up to 300 degree C per attached graph

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## What is the purpose of measuring car wheel temperature?

The purpose of measuring car wheel temperature is to monitor the heat range of the brake rotor and hub. This information can help identify potential issues with the braking system, such as worn brake pads or a malfunctioning caliper.

## What is considered a normal temperature range for car wheels?

A normal temperature range for car wheels is typically between 100-200 degrees Fahrenheit. However, this can vary depending on the driving conditions, such as frequent braking or driving on steep inclines.

## What factors can affect the temperature of car wheels?

Several factors can affect the temperature of car wheels, including driving habits, road conditions, and the condition of the braking system. Aggressive driving and frequent braking can increase the temperature, while driving on rough or hilly terrain can cause the temperature to fluctuate.

## Why is it important to maintain a proper temperature range for car wheels?

Maintaining a proper temperature range for car wheels is important for several reasons. First, excessive heat can cause brake fade, reducing the effectiveness of the brakes. It can also lead to premature wear and damage to the brake components. Additionally, monitoring the temperature can help identify any potential issues with the brakes before they become more serious.

## How can the temperature of car wheels be measured?

The temperature of car wheels can be measured using a handheld infrared thermometer, which can be pointed at the brake rotor and hub to get a reading. Some modern cars also have built-in sensors that can display the wheel temperature on the dashboard. Alternatively, a mechanic can use a diagnostic tool to retrieve temperature data from the car's computer system.

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