weight of wheels
03-22-2009, 09:31 AM
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Originally Posted by craigm1841' post='823709' date='Mar 22 2009, 10:20 AM
what kind of wheels and tires are you getting?
the pics are here. i got them used from this guy.
tis 20in dropstars, with nexen3000 tires
03-22-2009, 11:18 AM
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Originally Posted by Alpine White Girl' post='823438' date='Mar 21 2009, 11:28 PM
Will it effect the bmw if you get wheels that way a lot more than the stock ones?
03-22-2009, 11:58 AM
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Originally Posted by Alpine White Girl' post='823803' date='Mar 22 2009, 10:31 AM
http://s431.photobucket.com/albums/qq40/pantherfan69/
the pics are here. i got them used from this guy.
tis 20in dropstars, with nexen3000 tires
the pics are here. i got them used from this guy.
tis 20in dropstars, with nexen3000 tires
Those tires are 25 lbs each front, and 31 lbs each rear.
03-22-2009, 12:03 PM
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My Ride: My ex-ride: EU '08 LCI 520dA. Space Grey, Sport Seats in Black Leather/Fabric Anthracite, Sport Steering Wheel, A/C with Extended Features, Hi-Fi Speakers, Cup Holders, Cruise with Braking function, Folding Rear Seats, Xenons, Park Distance Control.
Originally Posted by Alpine White Girl' post='823438' date='Mar 22 2009, 05:28 AM
How much do the stock 138's with stock tires weigh?
RF tires way about 40-50% more than non-RF's :thumbsdown:
Get 18" or 19" original BMW wheels with non RF wheels!
03-22-2009, 07:32 PM
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My Ride: 2008 550i sport
Originally Posted by craigm1841' post='823612' date='Mar 22 2009, 06:43 AM
Wheel = 20.943 lbs
Center Cap w/ roundel = .035 lbs
Valve (for TPM equipped) = .0396 lbs
Valve cap (for TPM equipped) = .0022046 lbs
for a grand total of 21.0198 not including brake dust and balancing wieghts.
now if you want a thorough answer, you gotta ask a thorough question... what kind of tires do you have?
a shot in the dark is as follows:
Dunlop SP Sport 01 DSST
Size: 225/50ZR17
Blackwall
BMW RunFlat
ZR Speed Rated
with the tires listed at 28 lbs.
you are looking at roughly 49 lbs each not taking into account balancing weights and tread wear. i could have tried to figure out the exact tire weight but i got tired of doing research and math.
source citation:
http://bmwfans.info/original/E60/Lim/525i-.../ill-36_0673/#0
http://www.dunloptires.com/dunlop/display_...rea=Performance
http://www.tirerack.com
http://www.convertunits.com/from/kg/to/lbs
Center Cap w/ roundel = .035 lbs
Valve (for TPM equipped) = .0396 lbs
Valve cap (for TPM equipped) = .0022046 lbs
for a grand total of 21.0198 not including brake dust and balancing wieghts.
now if you want a thorough answer, you gotta ask a thorough question... what kind of tires do you have?
a shot in the dark is as follows:
Dunlop SP Sport 01 DSST
Size: 225/50ZR17
Blackwall
BMW RunFlat
ZR Speed Rated
with the tires listed at 28 lbs.
you are looking at roughly 49 lbs each not taking into account balancing weights and tread wear. i could have tried to figure out the exact tire weight but i got tired of doing research and math.
source citation:
http://bmwfans.info/original/E60/Lim/525i-.../ill-36_0673/#0
http://www.dunloptires.com/dunlop/display_...rea=Performance
http://www.tirerack.com
http://www.convertunits.com/from/kg/to/lbs
03-25-2009, 01:16 PM
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You guys are not right to say there is hardly any difference because it is only "10-15" pounds at each corner. Rotating mass is completely different animal than regular mass in a car. You change a couple pounds of rotating mass and hp climbs. Think of why bmw used an electric water pump? Decreasing 1 extra pulley with added rotational mass to turn the pulley saves 3hp (per bmw).
If you save 10 pounds per wheel/tire and if they initially were 40, that is 25 percent lighter and 25 percent less mass that the car has to rotated in order to move, that is a TON. I replaced my wheels and tires to save 14 pounds per wheel. I noticed a HUGE difference in all aspects. Bumps felt much much less harsh, cornering felt tighter and more planted, acceleration was better. Tires/wheels are also unsprung weight which mean each time you go over a bump they compress and than rebound up creating the feeling of the bump. If you decrease this weight, it will compress and then spring up which much less force since the mass sprining down and up is less which is why bumps feel better.
THink of yourself pedaling a bicycle. If you double your resistance do you not notice much less acceleration and difficultly keeping speed? That is the same as what rotational mass is doing. The ultimate goal of the engine is to turn the wheels. You make the wheels easier to spin, then all the engine's power is making more accelerate and move rather than wasting hp and energy trying to rotate the mass.
Not to mention the effect on gas mileage. Save 10 pounds on each corner and you will see 4mpg increase. I did atleast on freeway driving. So choose for yourself
If you save 10 pounds per wheel/tire and if they initially were 40, that is 25 percent lighter and 25 percent less mass that the car has to rotated in order to move, that is a TON. I replaced my wheels and tires to save 14 pounds per wheel. I noticed a HUGE difference in all aspects. Bumps felt much much less harsh, cornering felt tighter and more planted, acceleration was better. Tires/wheels are also unsprung weight which mean each time you go over a bump they compress and than rebound up creating the feeling of the bump. If you decrease this weight, it will compress and then spring up which much less force since the mass sprining down and up is less which is why bumps feel better.
THink of yourself pedaling a bicycle. If you double your resistance do you not notice much less acceleration and difficultly keeping speed? That is the same as what rotational mass is doing. The ultimate goal of the engine is to turn the wheels. You make the wheels easier to spin, then all the engine's power is making more accelerate and move rather than wasting hp and energy trying to rotate the mass.
Not to mention the effect on gas mileage. Save 10 pounds on each corner and you will see 4mpg increase. I did atleast on freeway driving. So choose for yourself
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