Run Flat tech
Tires/Wheels
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There are high-performance run-flats out there. The 911 GT2 has no spare, and I can guarantee you the new Enzo doesn't, either.
Riot
Typically though the weight you save on removing the spare donut is gained in mass from the new tires. Run-flats are heavy. Not too mention there isn't a huge selection to choose from.
Oh yeah, the weight increase on the tires is rotational mass, which is equivalent to 1lb equals about 4lbs of static mass. Can potentially affect handling and acceleration/deceleration.
I'd rather either live with the spare or ditch it and have a good road-side assistance program and/or a can of runflat (this stuff can really mess up your wheels).
Typically though the weight you save on removing the spare donut is gained in mass from the new tires. Run-flats are heavy. Not too mention there isn't a huge selection to choose from.
Oh yeah, the weight increase on the tires is rotational mass, which is equivalent to 1lb equals about 4lbs of static mass. Can potentially affect handling and acceleration/deceleration.
I'd rather either live with the spare or ditch it and have a good road-side assistance program and/or a can of runflat (this stuff can really mess up your wheels).
thats what i figured that the Run Flat tires would be heavy as all hell so i guess Living with a doughnut can be a nice to have 
Hopefully the doughnut is part of the weight balance of the car so leaving it where it belongs might be good for handling...
Hopefully the doughnut is part of the weight balance of the car so leaving it where it belongs might be good for handling...
G
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·Yes, bad for a number of reasons, including the increase to unsprung weight which affects handling. So, basically you spend a bunch of money on some real strong, light wt., forged wheels and then add back all of the weight in tires.91TB78 said:
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2,472 Posts
kg: can you elaborate a little? does the z06 not come with a spare? what is fix-a-flat? sounds like goo you is squirt into a flat tire to seal it up. if so, is this meant as a temporary thing; i.e. as soon as you get a chance, you should get a new tire? or is it like putting a plug in a tire, where you don't need to worry about it?
Canadian Orders : British Columbia
the fix-a-flat is just as you describe it.
the Z06, BMW M3, BMW M roadster/coupe & BMW M5 all do not come with spares. they have small air compressors with integral containers of "goop" which you put into the tire in the case of a non-sidewall leak problem.
dunno about the Z06, but the BMW's also come with lifetime roadside assistance for tire-related problems as well.
the goop solutions are veyr much temporary & only allow speeds of 50mph & over a relatively short distance.
Ben
the fix-a-flat is just as you describe it.
the Z06, BMW M3, BMW M roadster/coupe & BMW M5 all do not come with spares. they have small air compressors with integral containers of "goop" which you put into the tire in the case of a non-sidewall leak problem.
dunno about the Z06, but the BMW's also come with lifetime roadside assistance for tire-related problems as well.
the goop solutions are veyr much temporary & only allow speeds of 50mph & over a relatively short distance.
Ben
I have also heard that the goop can make a mess of the wheel & make removal difficult. I don't think it could hurt the rim its selt, it would just make removal by a non-expert tire changing place (we've all run into those) difficult & they might potentially damage the wheel.
given that a year's membership to AAA or similar service is pretty cheap & cell phone coverage is getting pretty universal, I'd not ever apply the goop solution to my wheels. you can either have a flatbed take the car to a dealer (BMW includes a little phone book with all the dealer in the US with each new car) or cal someone to help you out.
I'd just call home for someone to get one of the many extra wheels & tires I'm sure to have (I have a problem with having too many wheels ) and bring it to me with a jack & wrench & change it myself.
the stock (at least in other markets, US spec is unknown at this point) STi spare only works on the rear of the car (it doesn't clear the front brakes) but that just means that the tire replacement task is just a bit longer than otherwise.
Ben
given that a year's membership to AAA or similar service is pretty cheap & cell phone coverage is getting pretty universal, I'd not ever apply the goop solution to my wheels. you can either have a flatbed take the car to a dealer (BMW includes a little phone book with all the dealer in the US with each new car) or cal someone to help you out.
I'd just call home for someone to get one of the many extra wheels & tires I'm sure to have (I have a problem with having too many wheels
) and bring it to me with a jack & wrench & change it myself.the stock (at least in other markets, US spec is unknown at this point) STi spare only works on the rear of the car (it doesn't clear the front brakes) but that just means that the tire replacement task is just a bit longer than otherwise.
Ben
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2,826 Posts
What if your tire totally blows out? No goop is going to help you with that. I had the misfortune of having a tire totally blow out on me in the middle of no where on Thanksgiving day on my way home to visit family. There were chunks of tire all over and if I did not have a spare tire I would have been stuck trying to get a tow truck out to me on Thanksgiving day and can imagine what I would have paid. Instead I was back on the road in about 10 minutes. I would rather have a spare tire or run flats, but the run flats are very expensive.
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