jlane Posted November 23, 2004 Share Posted November 23, 2004 I'm looking for replacement tires for our RX300. I have locate what appears to be a reasonable replacement - Bridgestone AT/REVA's. The issue is that they are made in 235/70 vs 225/70(LEXUS recommended). There in 10 mm difference in width, approximately 14mm difference in diameter, and 44 mm in circumference. Has anybody made this change, what are the effects and/or pitfalls? Thanks Quote Link to comment Share on other sites More sharing options...
Rx-Fan Posted November 23, 2004 Share Posted November 23, 2004 If the stock tire is 225/70 replaced with 235/70: Speedometer reading will be 1.9% too slow With speedometer reading 60 mph, you're actually travelling 61.2 mph. This does not include any built-in error factoring in the speedo from Lexus. Quote Link to comment Share on other sites More sharing options...
ColinBarber Posted November 24, 2004 Share Posted November 24, 2004 Don't know how much the speedos are made to read over in the US but in the UK they are about 5-10% so changing to that size tire would make it more accurate. Quote Link to comment Share on other sites More sharing options...
TunedRX300 Posted November 24, 2004 Share Posted November 24, 2004 If the stock tire is 225/70 replaced with 235/70:Speedometer reading will be 1.9% too slow With speedometer reading 60 mph, you're actually travelling 61.2 mph. This does not include any built-in error factoring in the speedo from Lexus. ← But you also get the benefit of odometer reading < actual distance traveled, which means less depreciation of car resell value and more warranty time. Quote Link to comment Share on other sites More sharing options...
Geno Posted November 24, 2004 Share Posted November 24, 2004 If the stock tire is 225/70 replaced with 235/70:Speedometer reading will be 1.9% too slow With speedometer reading 60 mph, you're actually travelling 61.2 mph. This does not include any built-in error factoring in the speedo from Lexus. ← But you also get the benefit of odometer reading < actual distance traveled, which means less depreciation of car resell value and more warranty time. ← 255 75 R16 I love them and they fill the fender well perfect. Quote Link to comment Share on other sites More sharing options...
Rx-Fan Posted November 24, 2004 Share Posted November 24, 2004 255 75 R16 I love them and they fill the fender well perfect. ← But then your speedo will say - When driving 60 mph your actually speed is 65.6 or 9.4% too slow from actual. That's a pretty big difference. Just watch your speed on hwys! Quote Link to comment Share on other sites More sharing options...
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