There is also a lot of Hydraulic machinery and high pressure bleed air lines in the wheel wells plus the the proximity of the packs. On the A300 and the A320 both of which had wheel brake temp guages I don't ever recall seeing below about 30 degrees C in flight usually up around 50.
As to tire temps on takeoff. The boeing 727 had a boeing limitation of taxiing for takeoff of 35000 feet (IE 7 miles). This was because of frictional heating on the tires. If you exceded that limit you were to wait 44 mintues for takeoff. Most people don't know the limitation because there are relatively few places you can excede it. However, at Denver international from the freight ramp it is possible.
Cheers
Wino