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The Altezza / IS200 / IS300 Forum
Buying tyres (18")
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<blockquote data-quote="coriolis" data-source="post: 2965753" data-attributes="member: 63679"><p>Dear bros (& maybe sis),</p><p></p><p>I was alerted by my car detailer yesterday about my rear tyres being in not good condition, so I might have to look for new ones soon.</p><p></p><p>Below are my current wheels (I'm running 18", might consider 17" once I get back the stock 17" rims from the prev owner):</p><p>Front - yokohama a-drive r1 225/40z/r18 92w Rear - dunlop direzza dz101 245/45/r18 96w </p><p>I was using this calculator for some quick checks: <a href="http://www.1010tires.com/TireSizeCalculator.asp" target="_blank">Tire Size Calculator - tire & wheel plus sizing</a></p><p></p><p>Now the results really got me worried. According to the site, the general rule of thumb is if diameter diff is >3%, there will be risk of brakes failing. Stock tyres for IS300 is given as 215/45/17, so I will go by this as a benchmark.</p><p></p><p>The results say my front diameter difference is 1.88%, rear is 7.76%(!). I might have to change the rear tyres pronto. I messed a bit with the calculators and somehow the best ones would be 215/40/r18 (0.65%) and 225/40/r18 (1.88%). I would like to keep the tyres width difference at 20mm, but 235/40/r18 (3.12%) is borderline unsafe. </p><p></p><p>What I need to know from any sifus here is:</p><p>1) Can the website and the calculation be trusted?</p><p>2) Should I go for same width for front and rear, to keep both at +20 difference or reduce to +10 difference? Or it doesn't matter at all? </p><p>3) What width and profile should I look for then?</p><p></p><p>Appreciate if you can help me out here. Thanks!</p><p></p><p>p.s: and yes, recommend me a good tyre shop around Klang Valley or Selangor. :P</p></blockquote><p></p>
[QUOTE="coriolis, post: 2965753, member: 63679"] Dear bros (& maybe sis), I was alerted by my car detailer yesterday about my rear tyres being in not good condition, so I might have to look for new ones soon. Below are my current wheels (I'm running 18", might consider 17" once I get back the stock 17" rims from the prev owner): Front - yokohama a-drive r1 225/40z/r18 92w Rear - dunlop direzza dz101 245/45/r18 96w I was using this calculator for some quick checks: [url=http://www.1010tires.com/TireSizeCalculator.asp]Tire Size Calculator - tire & wheel plus sizing[/url] Now the results really got me worried. According to the site, the general rule of thumb is if diameter diff is >3%, there will be risk of brakes failing. Stock tyres for IS300 is given as 215/45/17, so I will go by this as a benchmark. The results say my front diameter difference is 1.88%, rear is 7.76%(!). I might have to change the rear tyres pronto. I messed a bit with the calculators and somehow the best ones would be 215/40/r18 (0.65%) and 225/40/r18 (1.88%). I would like to keep the tyres width difference at 20mm, but 235/40/r18 (3.12%) is borderline unsafe. What I need to know from any sifus here is: 1) Can the website and the calculation be trusted? 2) Should I go for same width for front and rear, to keep both at +20 difference or reduce to +10 difference? Or it doesn't matter at all? 3) What width and profile should I look for then? Appreciate if you can help me out here. Thanks! p.s: and yes, recommend me a good tyre shop around Klang Valley or Selangor. :P [/QUOTE]
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The Altezza / IS200 / IS300 Forum
Buying tyres (18")