Run flats to conventional tyres

[Emmo]

I have just forked out for a weld on one of my alloys and have been advised by the guy who did it to change my run flat tyres with conventional ones. The advantages I know are smoother ride, cheaper tyres and less chance of damage to the wheel when I hit a pot hole. I have several questions however which I am hoping someone can answer.

 

1. Can I run conventional tyres on the front and run flats on the back? (My front tyres are due for replacement soon, but the back ones still have lots of life left and will be replaced as and when they need it).

2. I have no spare - If I purchase one, can I use a space saver for instance and if so, what sort of size do I need to look for?

3. My rear wheels are wider than the front (staggered). If I have to have a full sized spare, what size do I get and can it be used on either axle?

4. The other option is not to have a spare at all and eventually the car will have four conventional tyres once they have all been replaced due to wear etc. If I got a puncture, rather than call my breakdown insurance all the time, can I use one of those emergency spray inflator aerosols? Can these be used on run flats as well?

 

I have checked my insurance and they are happy for me to make the change. My tyres are 225/35 R19 front, and 255/30 R19 rear. Car is a 2013 3-Series M-Sport 320d hard top convertible.

Thanks in advance for any replies.

Martin

[Greydog]

Morning Martin

You can run conventional tyres on the rims you have without issue not sure about them giving your rims any protection from pot holes though!! some of them around here will cripple a JCB!!

1. As your car is rear wheel drive you can run run flats on one axle and conventional on the other. Cars with X drive are very sensitive to variation in rolling radius front to rear which can cause serious problems for the transfer case.

2. I wouldnt bother with the spare I carry a couple of cans of tyre goo and a small compressor (tempt fate time) and seriously can't remember the last time I had a puncture.

3.My X5 runs 255 fronts and 315 rears so as above no spare but if you read your handbook it will show what size was originally recommended

4. See 2 above the spray inflators dont give correct tyre pressue so the small compressor is required in my opinion.

Convertable 3 series very nice,

Good Luck 

Dave

[Emmo]

2 hours ago, Greydog said:

Morning Martin

You can run conventional tyres on the rims you have without issue not sure about them giving your rims any protection from pot holes though!! some of them around here will cripple a JCB!!

1. As your car is rear wheel drive you can run run flats on one axle and conventional on the other. Cars with X drive are very sensitive to variation in rolling radius front to rear which can cause serious problems for the transfer case.

2. I wouldnt bother with the spare I carry a couple of cans of tyre goo and a small compressor (tempt fate time) and seriously can't remember the last time I had a puncture.

3.My X5 runs 255 fronts and 315 rears so as above no spare but if you read your handbook it will show what size was originally recommended

4. See 2 above the spray inflators dont give correct tyre pressue so the small compressor is required in my opinion.

Convertable 3 series very nice,

Good Luck 

Dave

Many thanks Dave, much appreciated - answers all my questions.