Alloy Issue

stethetarf

Hey All

Just wondering if anyone can help me as I have no knowledge on this subject really whatsoever!!

I drive a BMW 316i, E90. It currently has rims for a 5series on the car (bought that way) I need to get the tyres changed as they are wearing thin but the mechanic said I should think of changing the rims as well as the ones are the car will damage it as they are to big and the fuel efficiency will suffer also, does this make sense?

My next question would be has anyone used wheelbasealloys.com before as I was looking at a package online there for tyres and rims, the package I looked up was for 16'' Rial Oslo Rims with Pirelli P7 run flats for €1086 inc Delivery, does this sound like a good deal??

if not could anyone recommend a decent retailer and a decent brand?

Thanks again in advance appreciate the help!!

Ste

colm_mcm

How big are we talking? What size are the tyres on it?

Jammy Donut

Are you using spigot rings to centre the wheel to the hub? If so then you'll be grand, If not get some!


Can't imagine they doing damage TBH.

Nissan doctor

Unless they are bigger then 19" then there won't be any issues as the E90 was available with 19's as an option.

Clutchkick

Is that really true that bigger alloys affect fuel economy!?!?..i've heard than now from a few people.

mathepac

It depends - do they increase or decrease the unsprung weight on the axle, have they bigger "contact patches" with the road, are the wheels fitted with "grippy" performance tyres, etc.

Most of the eejits people who spout the "omg dude!!! like, biigger rimz meanz worse gas mileage, man!!!" message are talking like, total shyte.

focus_mad

Try out alloy-wheels.ie and get on to BMW-driver.net the forum, a lot of brilliant lloy options for you

stethetarf

Thanks for all the replies, the wheels i have on now are 16" with a profile of 225 - 55 - r16, they're official BMW rims so i'd assume they wouldn't attached rims that would damage the car?

I have a pre nct booking with Joe Duffy tomorrow so they said they'd investigate it as well, will let ya no what they say anyway!

Thanks everyone

colm_mcm

How are 16 inch too big, theyre too small if anything

Nissan doctor

Clutchkick wrote: »

Is that really true that bigger alloys affect fuel economy!?!?..i've heard than now from a few people.

They have a larger diameter meaning more of a leverage force required by the engine/box/driveshafts to get them moving from standstill, so less fuel efficient in this situation.

However the larger diameter also holds more momentum, meaning more speed maintained when you lift off the throttle once moving(depending on road conditions) so if driven correctly, can, in situations such as motorway driving etc, improve fuel economy over smaller wheels.

Numerous other factors like the road conditions, tyre pressure, tyre widths etc etc can effect thinks though.

--Kaiser--

mathepac wrote: »

Most of the eejits people who spout the "omg dude!!! like, biigger rimz meanz worse gas mileage, man!!!" message are talking like, total shyte.

Bigger wheels almost always mean increased gas mileage due to increase in unsprung weight and rotational mass.

mathepac

--Kaiser-- wrote: »

Bigger wheels almost always .. .

Almost always really means on a case by case basis, which is my point. With a number of complex factors in play, "almost always" isn't the answer IMHO.