New wheels - "Check AWD System" alert
#1
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Hey all,
Just got my new wheels. Put them on and synced the TPMS sensors. After a mile or so this alert comes on. If I turn of the car it goes away, until I drive another mile.
I got 20" wheels with 225-30-20 and 255-30-20. I see others with AWD on the forum running that setup.
Anyone have any ideas?
Thanks in advance!
Kuz
Just got my new wheels. Put them on and synced the TPMS sensors. After a mile or so this alert comes on. If I turn of the car it goes away, until I drive another mile.
I got 20" wheels with 225-30-20 and 255-30-20. I see others with AWD on the forum running that setup.
Anyone have any ideas?
Thanks in advance!
Kuz
#4
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tires are not the same size. using this: http://www.miata.net/garage/tirecalc.html
225/30/20 = 25.3in diameter
255/30/20 = 26.0in diameter
there is a 2.8% difference between the front to rear sizing. i usually would only allow <2%, plus you are AWD so running staggered is generally not a good idea.
225/30/20 = 25.3in diameter
255/30/20 = 26.0in diameter
there is a 2.8% difference between the front to rear sizing. i usually would only allow <2%, plus you are AWD so running staggered is generally not a good idea.
#5
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I was just about to post the link and information above. As a reference, the stock F sport wheels are 225/40-18 (front) and 255/35-18 (rear), which has a 0.1" difference. Yours is at 2.8% - far too big of a difference.
Better tire size would have been
225/40-20 and 255/35-20 (.1" difference) or 225/35-20 and 255/30-20 (.2" difference).
Better tire size would have been
225/40-20 and 255/35-20 (.1" difference) or 225/35-20 and 255/30-20 (.2" difference).
Last edited by mrkjsn; 08-27-14 at 09:36 PM.
#7
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You could see if adding an extra or two more psi in the front tires or dropping a little in the rears help equalize the diameters but not extreme to where it adversely affects your handling.
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#8
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Which might trip the TPMS. Best solution is to replace the front tires with 225/35-20.
#10
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that's a good idea... It will work. I have an AWD LS460 245/40 and 275/35... Check 1010 tires and play with the set up calculator, do you know your offsets? Never had a code nor a problem with my set up.
#11
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Ive got the exact same set of staggered tires awaiting wheels for my AWD. Is this seriously going to be an issue to run? What happens if you ignore the alert?
#12
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With that setup the front will rotate 797 revolutions per mile while the back will rotate 775 revolutions per mile. It will be out of sync and destroy your differentials. They could literally shatter or explode.
#13
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Thankfully, I havent taken mine out of the wrapping from TireRack yet. Might swap out my Hankooks for some Sumitomos or Yokohamas that offer the 225/35/20. Grrrr.
#14
#15
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You are running wrong size of tires.
You need to keep the front and rear at the same or very close overall diameter.
To keep your speedo and odometer correct you need:
F225/30R20
R255/25/20
You need to keep the front and rear at the same or very close overall diameter.
To keep your speedo and odometer correct you need:
F225/30R20
R255/25/20