235/70 R16 Vs 225/70 R16

[jlane]

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

[Rx-Fan]

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.

[ColinBarber]

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.

[TunedRX300]

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.

[Geno]

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.

[Rx-Fan]

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!