Deciding the best tyre ...

Z

zacatlondon

Member
Hi Everyone

Before i ask the 'question', my tyre size is 225/35r19 (front) and 255/30r19 (rear).

When i bought the car it came with Bridgestone Potenza RE050A (run flat). When it came to change the tyres, i did my research and found that Goodyear Eagle F1 Asymmetric 2 where very highly recommended. So i went with the run flat versions of the tyre. Here is what i found (for my driving style): although Goodyear was a softer tyre (i did run them with higher pressure) and did feel a lot more stable going over pot holes, at higher speeds, they felt unstable. Whereas Bridgestones felt a lot more stable at higher speeds. Other then that I didnt find a lot of difference between the grip in the 2 (Goodyear were probably slightly better in the wet. Here are my questions
1. Should i try non run flat Goodyear?
2. If i go with non run flats, there are a few posts going round about how run flat indicator will stay on. Is this the case?
3. If i go with run flats, has anyone got any experience on these or any other tyres (on a Z4, as there are a lot of opinions regarding Goodyear but not on a Z4)?
4. I am also toying with the idea of having Goodyears at the front and Bridgestones at the back, any views?

P.S. Bridgestones lasted a lot longer than Goodyear
 
I have had my Goodyear F1A2 non RFT and I have to say first impressions about a 1000 miles are pretty good. I would ask why have you increased the pressures on the new tyres, I can understand if you were going to a non RFT due to the lower side wall rigidity but not for another make of RFT.

Thus I would drop the pressures and see how that goes before investing in another set
 
Is your RFT light on? now that you've had non RFT. Also, how do you find non RFT's as compared to RFT's?

When i initialy put the Goodyears on, they felt too soft. Wasnt realy getting the feedback, so i played round with the tyre pressure and found a pressure that was more suited to the way I drive (I prefere going round bends/corners/roundabouts fast rather then going fast in a straight line :) ).
 
When my new wheels and tyres were fitted, I reset the tyre pressure monitoring system before setting off, have you done this?

My original wheels were 17" and the ride and drive was pretty good, no tram lining etcetera and reasonably quiet too, I have no gone up a size to 18" (non staggered though) and the tyres are probably quieter but the ride is firmer, bumps are not absorbed as readily, however the turn in is much better as is the steering which is more direct. I am going to look at the pressures this weekend to soften the ride a little.
 
I havent changed the tyres yet to non RFT. Saying that, im not sure how to reset the tyre pressure system in E89. Can i ask, how did you reset your system?
 
zacatlondon said:
I havent changed the tyres yet to non RFT. Saying that, im not sure how to reset the tyre pressure system in E89. Can i ask, how did you reset your system?
Click to expand...

Ah yours was one of those supplied without a user manual :poke:

Sorry just kidding :D

If you have sat Nav I have no idea, if not then with the ignition on and the car running, cycle the push/pull switch on the front of the indicator stalk until you reach the tyre symbol, press the button on the stalk release and then press and hold again until the reset symbol appears...that's it :thumbsup:
 
The runflat indicator will just need resetting if it stays on after the tyres are changed, I think it monitors wheel rotation rather than loss of air, so with a loss of air the affected wheel rotates at a different rate to the others which sets the off TPM.

From what I've read the Bridgestones runflats are probably the worst for ride but slightly sharper for handling. I've only experienced Michelin and Dunlops Runflats on the 1 Series and found the Dunlops to be a decent all rounder.

I would definitely steer clear of fitting different makes front and rear especially runflats as they may exhibit different running characteristics which will upset the Zed.

Tim.
 
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