[fizzerd]

I need your help here. Ever since I changed my winters to summer RFT's ( a week back), the steering is extremely light and is hard to control while changing lanes or due to minor road imperfections.

I dont think it would be the alignment since everything was fine on the winters. Could it be the steering rack or balancing or something else??

On another note, I lost my wheel lock key :S.

[shipill]

Re-tighten your wheels lug nuts.

[fizzerd]

Already tried that. I used the bmw wrench to re-torque them so i dont think thats the issue..

[Fozzy]

New tires? Break in period?

[fizzerd]

Originally Posted by Fozzy

New tires? Break in period?

No these tires (2seasons left) were on the car when I purchased my CPO. I got it in the winter and I put winters on after driving it from the dealership. Car was fine at the time.

[shipill]

check tire pressure

[fizzerd]

Originally Posted by shipill

check tire pressure

Checked. Its as per spec.

[shipill]

Wait until May when the weather gets warmer, RFT Tires perform worse in cold weather compare to standard tires.

[Bcruskie]

It simple science my friend. You switched back to runflats, they are very hard wall tires so you could drive on them while flat. Hard tire has a lot less flex which causes a lot less contact point with the road and gives you a feeling of light steering..
Most basic example i can think of is your bicycle. Think of winter tires are like your bicycle tires with almost no air and how soft and comfy the ride is. But when you fill your bikes tires till hard, bike becomes very quick and sporty, but you can feel every bump.

[Blackout335i]

Originally Posted by Bcruskie

It simple science my friend. You switched back to runflats, they are very hard wall tires so you could drive on them while flat. Hard tire has a lot less flex which causes a lot less contact point with the road and gives you a feeling of light steering..
Most basic example i can think of is your bicycle. Think of winter tires are like your bicycle tires with almost no air and how soft and comfy the ride is. But when you fill your bikes tires till hard, bike becomes very quick and sporty, but you can feel every bump.

+1

[fizzerd]

Originally Posted by Bcruskie

It simple science my friend. You switched back to runflats, they are very hard wall tires so you could drive on them while flat. Hard tire has a lot less flex which causes a lot less contact point with the road and gives you a feeling of light steering..
Most basic example i can think of is your bicycle. Think of winter tires are like your bicycle tires with almost no air and how soft and comfy the ride is. But when you fill your bikes tires till hard, bike becomes very quick and sporty, but you can feel every bump.

When I brake down from 60kmh at a red light and its not a hard brake, my car shakes a bit..

Also, does anyone know how to find a wheel lock key? I only got one key and I dont know the code or anything..

[Blackout335i]

Originally Posted by fizzerd

When I brake down from 60kmh at a red light and its not a hard brake, my car shakes a bit..

Also, does anyone know how to find a wheel lock key? I only got one key and I dont know the code or anything..

check your alignment, sounds like its out...

Think you'll have to get a replacement wheel lock at the dealer.

[335BBS]

Originally Posted by Bcruskie

It simple science my friend. You switched back to runflats, they are very hard wall tires so you could drive on them while flat. Hard tire has a lot less flex which causes a lot less contact point with the road and gives you a feeling of light steering..
Most basic example i can think of is your bicycle. Think of winter tires are like your bicycle tires with almost no air and how soft and comfy the ride is. But when you fill your bikes tires till hard, bike becomes very quick and sporty, but you can feel every bump.

How does a stiff sidewall affect contact patch?

Originally Posted by fizzerd

When I brake down from 60kmh at a red light and its not a hard brake, my car shakes a bit..

Also, does anyone know how to find a wheel lock key? I only got one key and I dont know the code or anything..

Your rotors are probably warped if you get a shake under braking. Those locks are absolutely useless. They may slow a thief but not much. Thats what insurance is for.