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Old 10-18-2013, 11:49 AM   #1
Pecosdude
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Member#: 93033
Join Date: Aug 2005
Chapter/Region: International
Location: Indonesia
Vehicle:
- SG5 & GVF

Default Thank you, bndtechsource 'Tire Data Calculator'

I wish to thank bndtechsource for making his online 'Tire Data Calculator' available:
http://bndtechsource.ucoz.com/index/...alculator/0-20

To make a long story short, due to a store employee screw up, I ended up with some staggered or different width wheels, with 4 same size tires.

The wheels width are 8.5 inch front vs 9.5 inch rear.
With four 245/35/19 tires.
There was almost a 10mm (0.4 inch) differences in the overall front vs rear diameter.

I do not wish to refund or exchange them because it is more expensive to do so. (Shipping, import duty, etc)

However, thanks to bndtechsource online tire calculator, I am able to somehow salvage this bad situation.

I was able to find the tire size to match the 'rolling circumference' diameter to within the 1/4 inch tolerance.
Front 8.5 inch width, with 245/35/19 tires
Rear 9.5 inch width, with 255/35/19 tires.

Now, I just need to find another online calculator to figure out how much tire pressure that I need in the front vs rear, to lessen the understeer effect.
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Old 10-18-2013, 12:25 PM   #2
JonnyV2889
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Member#: 197384
Join Date: Dec 2008
Chapter/Region: NESIC
Location: MWV NH
Vehicle:
2006 WRX Ltd
OBP

Default

Quote:
Originally Posted by Pecosdude View Post
I wish to thank bndtechsource for making his online 'Tire Data Calculator' available:
http://bndtechsource.ucoz.com/index/...alculator/0-20

To make a long story short, due to a store employee screw up, I ended up with some staggered or different width wheels, with 4 same size tires.

The wheels width are 8.5 inch front vs 9.5 inch rear.
With four 245/35/19 tires.
There was almost a 10mm (0.4 inch) differences in the overall front vs rear diameter.

I do not wish to refund or exchange them because it is more expensive to do so. (Shipping, import duty, etc)

However, thanks to bndtechsource online tire calculator, I am able to somehow salvage this bad situation.

I was able to find the tire size to match the 'rolling circumference' diameter to within the 1/4 inch tolerance.
Front 8.5 inch width, with 245/35/19 tires
Rear 9.5 inch width, with 255/35/19 tires.

Now, I just need to find another online calculator to figure out how much tire pressure that I need in the front vs rear, to lessen the understeer effect.
They'd be eating the costs if it was me. That thing is never going to be right.
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Old 10-18-2013, 12:38 PM   #3
sc00by4life
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Join Date: Sep 2005
Chapter/Region: NWIC
Default

You're going to get horrible understeer either way with a staggered setup.

If it was me, I'd send them back - the vendor is responsible for the **** up and the costs associated with that mistake.

you can match rolling circumference, but it still won't be enough to keep the clutch in the diff from frying itself. think weight/grip tolerances.
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Old 10-18-2013, 01:35 PM   #4
Pecosdude
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Join Date: Aug 2005
Chapter/Region: International
Location: Indonesia
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- SG5 & GVF

Default

Thanks for all the inputs.

Guess what, that guy still insisted that there wont be any problems if that mismatch wheel set is installed in an AWD subaru.
No sure whether he believe so, or he just do not want to bear the cost.
I still suspect its the first one, since he has been selling staggered wheels for those AWD european sports car that comes stock with a staggered wheel setup.

Anyway, even we we split the amount; It is more beneficial for me to buy another pair to match the uneven set.
Its due to the shipping cost to exchange the wheels, then ship it back to me, and still have pay another import duty even though its just an exchange item.

I may try to test it for a month or two and see how bad it will turns out to be.
Will try to update this thread with the result.

There is always the stock wheels and tires.
Oh well.
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Old 10-18-2013, 02:53 PM   #5
sc00by4life
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Quote:
Originally Posted by Pecosdude View Post
Thanks for all the inputs. Guess what, that guy still insisted that there wont be any problems if that mismatch wheel set is installed in an AWD subaru. No sure whether he believe so, or he just do not want to bear the cost. I still suspect its the first one, since he has been selling staggered wheels for those AWD european sports car that comes stock with a staggered wheel setup. Anyway, even we we split the amount; It is more beneficial for me to buy another pair to match the uneven set. Its due to the shipping cost to exchange the wheels, then ship it back to me, and still have pay another import duty even though its just an exchange item. I may try to test it for a month or two and see how bad it will turns out to be. Will try to update this thread with the result. There is always the stock wheels and tires. Oh well.
Other cars using staggered setups is not the same as Subaru staggered setups.

The experience with other cars is 100% irrelevant.
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Old 10-18-2013, 03:01 PM   #6
Mr Wrex
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Join Date: Sep 2012
Chapter/Region: Tri-State
Location: Orange County, NY
Vehicle:
2012 WRX stage 2+
DGM (sedan)

Default

Quote:
Originally Posted by Pecosdude View Post
I may try to test it for a month or two and see how bad it will turns out to be.
Will try to update this thread with the result.
Will your next thread be titled "Center diff replacement cost"? Tell the vendor to pound sand and rectify his mistake. AWD + staggered = no no
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Old 10-18-2013, 06:17 PM   #7
Pecosdude
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Join Date: Aug 2005
Chapter/Region: International
Location: Indonesia
Vehicle:
- SG5 & GVF

Default

Duh, seems that I am really screwed.

This has been a very bad month for me regarding spending and money wise.

Ok, Lets say, money wise, the worst case scenario happen and I could not recoup my loss, what are my options?
Any suggestion on how to salvage the situations without spending another substantial amount of money?

Right now I could only think of two options.

The first option is buying a new tire to match the circumference, as stated in the opening thread. But the risk still exist to the center diff.
It will also add more understeer.

The second option that I can think of is to sell off those wheels. (bleh)

All the other options seems to need me spend another substantial amount of money.

Take the risk?
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Old 10-18-2013, 06:26 PM   #8
sc00by4life
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Default

the vendor sold you the wrong parts. plain and simple. THEY are on the hook for it.
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Old 03-30-2021, 12:21 AM   #9
bndtechsource
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Join Date: Mar 2013
Default

Hello All,

BND TechSource has a new and improved website! Please visit us at https://bndtechsource.wixsite.com/home or https://bndtechsource.wixsite.com/ho...ata-calculator for the Tire Data Calculator which now has interactive input for loads and air pressures and outputs for stiffness rates and deflection.

Please let me know your feedback.

Thanks,

bndtechsource
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