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BMW 320d E46 Wheel size?

BMW 320d E46 Wheel size?

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King K

Original Poster:

218 posts

99 months

Wednesday 1st April 2009
quotequote all
Hi guys

I recently swapped a set of 16" standard wheels for a set of 18" MV2 Style on my BMW 320d E46 Saloon.

I have noticed a significant reduction in acceleration. Would this be correct or am I imagining it?

Also after fitting on the bigger wheels the steering feels very sensitive, i.e. it shakes/vibrates more so when going over small potholes/uneven road surface etc.

Is this what I would expect after fitting on bigger wheels? The only upside is that there is loads more grip! smile

Would anybody recommend me changing to 17's? As I would like a bit more grip than what is currently provided by the 16's

Many Thanks!

TheEnd

15,370 posts

97 months

Wednesday 1st April 2009
quotequote all
Check the tyres sizes, usually you'll get more wheel and less rubber, so the circumference remains the same. That won't affect the overall gearing. If they are bigger as a whole, then it can dull acceleration a bit.

If they are heavier, they will slow it a little too, but i wouldn't imagine it'd be too drastic.

cjay03

208 posts

92 months

Wednesday 1st April 2009
quotequote all
for 18" mv2 alloys on your car the fronts should be 225/40 18s and rear 245/40 18s unless they are replicers and they will all be 225/40s. Check the plate by the door lock it will tell you the profiles there

Bigger the alloy the heavier it is in general terms so that could be the acceleration issue but its a very small difference especialy on a diesel

King K

Original Poster:

218 posts

99 months

Wednesday 1st April 2009
quotequote all
The front are 225/40 18 and the rears are 255/35 18.

Does anybody know the cause of the increased sensitivity of the steering wheel when going over potholes/uneven road surfaces etc?

E30M3SE

8,144 posts

105 months

Wednesday 1st April 2009
quotequote all
King K said:
The front are 225/40 18 and the rears are 255/35 18.

Does anybody know the cause of the increased sensitivity of the steering wheel when going over potholes/uneven road surfaces etc?
That will be due to the lower profile of the tyre on the 18" MV alloy.
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MattW

1,047 posts

193 months

Wednesday 1st April 2009
quotequote all
I have a set of 16s with winter tyres on and a set of MV2's for std use. The MV2's do give a slightly more harsh ride than the 16s this is down to the much lower profile rubber. I also find that the car feels slightly heavier to steer with the 18s on, I put this down to the wider tyres on the 18s.

JimexPL

1,367 posts

121 months

Wednesday 1st April 2009
quotequote all
King K said:
Hi guys
I recently swapped a set of 16" standard wheels for a set of 18" MV2 Style on my BMW 320d E46 Saloon.
I have noticed a significant reduction in acceleration. Would this be correct or am I imagining it?
Also after fitting on the bigger wheels the steering feels very sensitive, i.e. it shakes/vibrates more so when going over small potholes/uneven road surface etc.
Is this what I would expect after fitting on bigger wheels? The only upside is that there is loads more grip! smile
Would anybody recommend me changing to 17's? As I would like a bit more grip than what is currently provided by the 16's

Many Thanks!
16s are pretty much optimum for the E46, unless you really need the increased grip or are fitting larger brakes. The heavier, wider wheel will amplify any slack in your suspension/steering that the 16s wouldnt show up and the lower profile will send more shocks through the bodyshell.
Are the tyres a decent make and evenly worn? If they are XL rated then the sidewalls will be quite stiff (and possibly too stiff for the 3 series).
If the wheels are used then there is a very high chance that one or more of them will be buckled.
There isn't a massive difference in the ride quality between 17s and 18s (if they're both on similar tyres) and the typical 225 width all round in E46 17s is more than enough for a 320d. BMW style 103s look good on the E46 (normally found on 3.0i SE Z4s) and are different from the norm.

Edited by JimexPL on Wednesday 28th April 09:58

BuRn1e

1 posts

77 months

Tuesday 27th April 2010
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I just fitted MV2 style 8x18 to my 320d and when fitted to the rear hubs the wheels will turn then stop dead, something is preventing them from turning. I had 19" m3 ones on before and they were fine. any ideas?

bolide

378 posts

163 months

Thursday 29th April 2010
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This is really common on Mercedes. Some replica alloys have a shallower face so the bolts protrude through too far and foul the handbrake mechanism behind the hub. It will expensive to fix if you've driven it like that

Nick Froome

4nonymous

2,920 posts

100 months

Friday 30th April 2010
quotequote all
cjay03 said:
for 18" mv2 alloys on your car the fronts should be 225/40 18s and rear 245/40 18s unless they are replicers and they will all be 225/40s. Check the plate by the door lock it will tell you the profiles there

Bigger the alloy the heavier it is in general terms so that could be the acceleration issue but its a very small difference especialy on a diesel
Wrong, it's 255/35 on rears.