New tires. Need halppp

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Jan 17, 2019 | 10:36 AM
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Hey everyone. I’m looking at the Achilles atr sport 2 tires after reading a thread on here. I’ve got an 04 coupe base so ( correct me if I’m wrong) I need front 225/50/17 and rear 235/50/17. Looking on simpletires website though they have the front size I need but for rear I’m left with only the option of a 235/45/17. Would this work? I’m not sure what the middle number means tbh. I’ve been told Achilles doesn’t even make 235/50/17


UPDATE: I found out what the middle number means. The 50 in this case but I’m still unsure if I can substitute the 235/50/17 for a 245/50/17
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Jan 17, 2019 | 11:43 AM
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Quote:
Originally Posted by thatguysky
Hey everyone. I’m looking at the Achilles atr sport 2 tires after reading a thread on here. I’ve got an 04 coupe base so ( correct me if I’m wrong) I need front 225/50/17 and rear 235/50/17. Looking on simpletires website though they have the front size I need but for rear I’m left with only the option of a 235/45/17. Would this work? I’m not sure what the middle number means tbh. I’ve been told Achilles doesn’t even make 235/50/17
I found out what the middle number means. The 50 in this case but I’m still unsure if I can substitute the 235/50/17 for a 245/50/17
May I suggest you go to www.thetirerack.com, they sell tires for wholesale and will deliver to your front door! With them you'll have hundreds of options and tons of information and help. Here's an example, the UTQG is the wear factor! Normal street tires that will last have a UTQG of 300 which are still sticky but should last 40K miles if your alignment is correctly set. One recommendation I have is BFG's in 245/50X17 on all four corners for high speed stability, I'm not of fan of running 225's on the front of our coupes!
Check out the Tire Rack, you'll gain more knowledge about tires...Gary
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Jan 17, 2019 | 11:45 AM
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Find an online tire calculator and compare the diameter/circumferences. My guess is that you may need to go to a 245/45/17 if you widen the tire to keep the overall numbers within 1-3% for VDC compatibility.
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Jan 17, 2019 | 01:47 PM
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Quote:
Originally Posted by G2B35AGN
Find an online tire calculator and compare the diameter/circumferences. My guess is that you may need to go to a 245/45/17 if you widen the tire to keep the overall numbers within 1-3% for VDC compatibility.

i found a calculator and compared but I’m not sure how to read the results of which tire could substitute this
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Jan 18, 2019 | 10:51 AM
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I hope this link works but in any case the difference in rolling diameter between 235/50/17 and 235/45/17 is 3.65% which will cause issues with the VDC.

https://g35driver.com/forums/tire_rim_calculator.php

Going to a 245/50/17 is a 1.48% difference which will be fine.
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