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Old 04-24-2003, 12:44 PM   #1
siman
Scooby Newbie
 
Member#: 23311
Join Date: Aug 2002
Default Speedo calibration Pzero 215/45/17 and stock 205/55/16

Question for you math gurus out there:
1) how much will my speedometer be off?
2) has anybody had the dealership re-calibrate their speedo? Is this free or how much did it cost?

Tire specs I got directly from Pirelli and from Bridgestone website as follows:

Pzero Nero 215/45/17:
-Overall Diameter: 24.8
-SW: 8.6
-Rim: 7 - 8.5
-Rev/Mile: 839
-weight: 22 lbs

Stock Bridgestone RE92, 205/55/16
-Overall Diameter: 25.1
-SW: 8.4
-Rev/mile: 830
-weight: 21 lbs

FYI:

Just mounted 215/45/17 neros on P1s and they are awesome. Only driven 2 days on them, but like them much better than the Falken Azenis and Contisport 2's overall. Still need to drive them hard in the twisties to assess cornering ability, however, so far they are quieter, ride much better, and feel really sticky (the contisport 2's were 225/45/17 and had an irritating bouncy and vague ride and handled worse than either the neros and azenis; maybe due to the soft walls). The Azenis had awesome cornering tires but were loud with a harsh ride. The weight of the Azenis at 26 lbs was also a detriment.

According to Pirelli, the 215/45/17 neros weigh 22 lbs,and i can tell the difference in acceleration and overall lighter feel of my wrx (some people argue otherwise, but believe me, you can tell the difference of 4 lbs of unsprung wt).

get the Neros, you won't regret it!

FYI: got them installed with lifetime rotation balance etc at discount tire for $165 a piece (reasonable deal considering that tire rack charges 149 plus shipping)

Thanks for your help!
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Old 04-24-2003, 07:28 PM   #2
mch
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Member#: 30039
Join Date: Nov 2002
Chapter/Region: NESIC
Location: still, colder than you, vt
Vehicle:
2002 wrx wagon
dirt slvr

Default

Don't worry about the speedo - the dif is like 1.2% which translates into less than 1 mph at an indicated 55mph.

BTW the P1's are around 20.5#/ wheel and the oem 16" rims are ~16.5#

Your setup weighs ~42-43#/ wheel vs the ~37-38# of stock. I believe you are experiencing what researchers call the placebo effect.

Glad you like the tires.

Last edited by mch; 04-24-2003 at 07:33 PM.
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Old 04-25-2003, 01:24 AM   #3
siman
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Member#: 23311
Join Date: Aug 2002
Default

Thanks for you reply. I know that the new setup is still heavier than the stock setup. However, it's still 4-5 lbs lighter than what I had. All i meant is that 4-5 lbs is still noticeable as far as I my buttmeter can tell. Now I just need to sell the p1's and get me some supperleggeras or ssr comps! ...on second thought, maybe I'll just save for the Evo 9 or STI 2005.
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Old 04-25-2003, 11:52 AM   #4
bigdweeb
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Chapter/Region: NESIC
Location: Boston
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13 Ford Explorer
14 ISM STi

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You can use Miata.net's tire size calculator to determine how much your speedo will be off by.
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Old 04-25-2003, 02:28 PM   #5
LoveThatWeasel
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Member#: 20216
Join Date: Jun 2002
Location: Westchester Co., NY
Vehicle:
2002 WRX Wagon
Silver

Default Re: Speedo calibration Pzero 215/45/17 and stock 205/55/16

Quote:
Originally posted by siman
Just mounted 215/45/17 neros on P1s and they are awesome.
The setup I want to buy.

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