2 questions

toysky, Jan 29, 3:46am
Road noise ------------ can slightly misaligned wheels increase this!

Roof bars ----------- Can they increase this as well ! btw do they also increase fuel consumption when not in use, and you are driving 750 k a week highway speeds

Thanks
intrade, Jan 29, 3:50am
1, unlikely unless it squeals lol fuelconsumption yes higher and tyre worn out.
2,roof bars that run along the roof and are fitted by manufacturer make no noise unless there is something not factory on them no more. Roof bars running across will mostly make noises at higher speed
tonyrockyhorror, Jan 29, 4:02am
Not appreciably unless out by a LOT. Most road noise comes from the tread pattern.

Depends what you mean by 'roof bars'.
ryanm2, Jan 29, 4:06am
cross bars (that fit across existing roof rails) make noise, as do roof racks. you can dampen them and yes, the car is less aerodynamic so fuel consumption goes up. More noticeable on long runs setting at 100km, not around town.
NZTools, Jan 29, 4:10am
Tyres often become noisier as they wear. this can be especially noticable with 4x4 tyres. My Mud terrains for example, absolutely howl on the road now that they are half worn
clark20, Jan 29, 4:31am
Yokohama had a bad run on a pattern, 1/2 worn sounded like wheel bearings gone, I think is was the 510 pattern.
extrayda, Jan 29, 4:57am
roof racks across the roof make a racket on my car (Cefiro Wagon) - they were cheap square profile bars, and make a lot of noise anything from around 60ks upwards.I just take them off when I don't need them :-)
toysky, Jan 29, 6:43am
yes mine are the square profile ones across roofThule brand
grangies, Jan 29, 8:51am
Absolutely, they will increase fuel consumption.

Compare it to jogging with no load, and then holding a piece of cardboard over your head and jogging.
bubbles244, Jan 29, 8:54am
No and maybe if the car was upside down.
jason_247, Nov 16, 8:46am
well worth the extra investment for whisp bars

not so much for the fuel economy but for the sanity on long trips