What is the difference in weight?Rims&Tyres

[Jarv]

Hi Guys.

I would like to ask a technical question:

I currently have the 17" M sport runflat rims and 225 all round runflat tyres on my 116i.

Now my question is, will a 18" rim (non run flat) and tyre (non run flat) be heavier or lighter than my current set up?

Thanks
Jarryd

 

[ntuthuko]

Theres no run flat rims or non run flat rims , and the weight of your new setup will depend on many factor mainly the type of rim oem vs aftermarket and even if its aftermarket you get many many styles and variants which all weigh differently

 

[moranor@axis]

this will depend alot on what wheel you choose...

 

[msm]

Generally speaking, cheap after market wheels are heavier.
Also, run flat tyres are heavier than non run flats.

Hence, its difficult to say what the end result will be.

 

[Coisman]

Use this formula to calculate if it will be heavier or lighter...

Substitute the following with relevant values:

R = Radius of tyre
p = Tyre Preasure
e = what make of tyre
l = width of tyre
H = hight of suspension

Here is the formula... :mmm: ...Good luck!!

 

[SP33DYV]

Use this formula to calculate if it will be heavier or lighter...

Substitute the following with relevant values:

R = Radius of tyre
p = Tyre Preasure
e = what make of tyre
l = width of tyre
H = hight of suspension

Here is the formula... :mmm: ...Good luck!!

:flyfun:

 

[gavsadler]

LOL @ Coisman.

@ntuthuko: Apparently the rims on BMW's fitted with runflat tyres have a thicker bead where the tyre fits onto. As such, you can fit a normal tyre to a "runflat" rim, but you can't fit a runflat tyre to a "normal rim" - that's what I've heard from a few places.

Runflat tyres are probably a bit heavier than a normal tyre of the same size - due to the fact that the side wall is thicker (although this is probably marginal).

And then an 18in rim will also be slightly heavier than a 17in rim. Unless you spent LOTS of money and get some forged rims.

 

[Jarv]

ok cool Thanks guys.
il stick to what i have currently

Thanks for that formula,i couldnt do it LOL:rollsmile:

Jarryd

 

[Legacy]

It depends on what wheels and tyres you go for. I have a set of 18" Style 313 wheels on my touring and they are actually OEM BBS wheels. Without tyres they must weigh like almost nothing. I was expecting them to be quite heavy (from previous experience with 18" wheels) and they were not at all.

 

[328ii]

Maybe easier to just use a scale..?

You know the thingamajiggy used for weighing stuff...

8?>

 

[moranor@axis]

tire weights are hard to get... maybe go weigh the tires at the shop then work out what weight rim you need to balance it out...

 

[Philip Foglar]

Okay, according to http://felgenkatalog.auto-treff.com/ your current style 207 M sport wheels weigh 10.13 (narrow front) and 10.16 (wide rear) - quite light wheels to begin with!

Now 1 Series style 261 M sport 18" wheels weigh 11.80 (narrow front) and 11.23 (wide rear), so a bit heavier.

I had a quick look on www.tirerack.com for typical tyres for these wheels and tyre weights.

17" tyres (205/50R17 and 225/45R17):
11.8 kg and 11.8 kg - Bridgestone RFT's (total = 21.93 kg and 21.96 kg)
9 kg and 10.9 kg - Hankook non-RFT's (total = 19.13 kg and 21.06 kg)

18" tyres (215/40R18 and 245/35R18):
11.3 kg and 11.8 kg - Pirelli RFT's (total = 23.10 kg and 23.03 kg)
9.5 kg and 10.0 kg - Hankook non-RFT's (total = 21.30 kg and 21.23 kg)

 

[moranor@axis]

http://felgenkatalog.auto-treff.com wheel weights are not all correct it says my wheels weigh 5,57kg but the are around 8kg...

but looking at the tire weights it seems you will not break even anyway because 17" RFT weigh about the same as 18" non RTF

 

[Jarv]

Jeepers, thanks for all the effort there Phillip Foglar:ty:

Thanks Guys, i see there is not a major difference.

What i was thinking of was getting 18" aftermarket rims like A-line or something with normal non rft , but then i thought about it and will still need to buy a spacer kit(spare wheel)

Shot:thumbs:

 

[Shiny]

Use this formula to calculate if it will be heavier or lighter...

Substitute the following with relevant values:

R = Radius of tyre
p = Tyre Preasure
e = what make of tyre
l = width of tyre
H = hight of suspension

Here is the formula... :mmm: ...Good luck!!

Hehe...good one:roflol:

 

[Philip Foglar]

http://felgenkatalog.auto-treff.com wheel weights are not all correct it says my wheels weigh 5,57kg but the are around 8kg...

but looking at the tire weights it seems you will not break even anyway because 17" RFT weigh about the same as 18" non RTF

Yep, was using this more as a guide, but was also surprised that the tyre weights between normal tyres and RFT's are not really as much as usually thought...