Quick Decision: PS2 or Pilot Sport for rears? - The Unofficial BMW M5 Messageboard (m5board.com)

AWBoy · 20th July 2006, 23:37

I have to make a VERY quick decision if I want to replace both rears with regular Pilot Sports or replace just the dead one with a new PS2 and leave the other one on (it's at about 50% tread life).

Someone on the forum said that Pilot Sports in the back and PS2s upfront worked extremely well. Thoughts?

greg · 20th July 2006, 23:44

I don't think you should replace only one side if you have 50% wear on the other. I suspect that if the tires don't rotate at (almost) exactly the same speed, you will add signficant wear on the diff.

AWBoy · 20th July 2006, 23:46

Quote:

Originally Posted by greg

I don't think you should replace only one side if you have 50% wear on the other. I suspect that if the tires don't rotate at (almost) exactly the same speed, you will add signficant wear on the diff.

Yeah, those are my thoughts too.

So then:

PS2s on the rear (will have to give up the beast for a night! NOOOO!!!!)

or

Regular Pilot Sports on the rear (can get done this afternoon)

eljockvis · 20th July 2006, 23:56

hi
i run pilot sport 2 on the front and pilot sport on the rear,great combination!

AWBoy · 21st July 2006, 00:01

Quote:

Originally Posted by eljockvis

hi
i run pilot sport 2 on the front and pilot sport on the rear,great combination!

Why did you go with that combination? Have you ever tried PS2s in the rear?

AWBoy · 21st July 2006, 00:12

Since I don't think BMW is going to have time to replace 2 tires today, I just went ahead and ordered the PS2s. No beast for me tonight

ard · 21st July 2006, 02:16

Quote:

Originally Posted by AWBoy

Since I don't think BMW is going to have time to replace 2 tires today, I just went ahead and ordered the PS2s. No beast for me tonight

Did you get the regular version or the MBZ version??

All you need to know:
No More PS2's?

There are pictures of the MBZ version in the thread- it is on the tire sidewall, maybe not the receipt.

AWBoy · 21st July 2006, 02:20

Quote:

Originally Posted by ard

Did you get the regular version or the MBZ version??

The place I ordered it from never mentioned MBZ and I just asked for Michelin Pilot Sport PS2s and they said they can get em by the morning.......dunno I guess. I'll read the receipt very closely when I pick them up in the morning.

Habu · 21st July 2006, 02:27

AWBoy,

There's been discussion on the limited availablity of PS2 for the rears. Check this thread.

No More PS2's?

Since you're getting them for the rear, you probably will be ok.

Bob

ard · 21st July 2006, 03:08

Quote:

Originally Posted by greg

I don't think you should replace only one side if you have 50% wear on the other. I suspect that if the tires don't rotate at (almost) exactly the same speed, you will add signficant wear on the diff.

For every ONE MILLIMETER in tread depth mismatch, you will get a differential in the relative revolutions between tires of roughly 2.4 revolutions per mile.

A one quarter inche mismatch (6mm diff in roling radius) will give you 761 revolutions per mile versus 775... a difference of 15 revs per mile.

At 60 mph, or one mile per minute that is one rev every 4 seconds or one-quarter HZ....

what's that mean?

beats me, but seems pretty slight.

hey, what if you ran the more worn tire with 2 psi more pressure?

A