Alloys Choice 16" vs 17" is milage adjusted or is it 5% off?

twad · 20th January 2008, 10:27

I am planning to buy 16" tyres for winter use, to get a safer and smoother ride.

Is the car somehow adjusting the milage when using a smaller tyre or is just 6% considered neglible?

When a 17" wheel turns 360 degrees the car moves 1,32 meters, but when a 16" wheel turns 360 degrees the car moves just 1,28 meters which is about 3-5% less.

I cannot find any explanations on the net of how car manufacturers solve this problem - so I thought I might just as well ask here. Haven't bought my civic yet, but probably will do it next week.

Nick7 · 20th January 2008, 10:42

225/45/17 vs. 205/55/16 difference in diameter is just 0.4%, and thus speed reading difference is 0.4%, which is basically nonexistant.

civicfan · 20th January 2008, 11:07

Putting it yet more simply, 15,16,17 or whatever inch is the diameter of the alloy NOT the wheel

twad · 20th January 2008, 11:13

I thought that would be about 4% difference, but I might be wrong - I haven't actually measured it just done some calculations on the back of a napkin.

If it is just 0,4% then I would agree it is neglible.

So, the tyre is always the same, but the alloy is smaller - ah ok.

kenP · 20th January 2008, 11:55

A 225/45/17 tyre is 11.5mm shallower than a 205/55/16 tyre, which means that all together the wheel is 2mm different in diameter. To work out the tyre depth it's the first number multiplied by the second then divided by 100.

John Smith · 20th January 2008, 13:14

Tire/Wheel Combination Calculator

20th January 2008, 10:27	#1 (permalink)
twad Valve Cap Join Date: 18th November 2007 Location: Norway Posts: 9 Thanks: 0 Thanked 0 Times in 0 Posts iTrader: (0)	16" vs 17" is milage adjusted or is it 5% off? I am planning to buy 16" tyres for winter use, to get a safer and smoother ride. Is the car somehow adjusting the milage when using a smaller tyre or is just 6% considered neglible? When a 17" wheel turns 360 degrees the car moves 1,32 meters, but when a 16" wheel turns 360 degrees the car moves just 1,28 meters which is about 3-5% less. I cannot find any explanations on the net of how car manufacturers solve this problem - so I thought I might just as well ask here. Haven't bought my civic yet, but probably will do it next week.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads for: 16" vs 17" is milage adjusted or is it 5% off?
Thread	Thread Starter	Forum	Replies	Last Post
Phone pairing sony t68i ok, but voice says "no phone found"?	psykik	Electronics	5	29th November 2007 14:00
Phone Blackberry 8300 "Curve" %£$'~@^ pairing with Bluetooth	BlacknBlue	Electronics	7	30th October 2007 15:25
Tyre Choice Warning! "Fake" tyres being sold (including Goodyear F1)	Pottsy	Wheels, Tyres, Suspension and Brakes	16	5th October 2007 11:43
Satnav "No DVD Disc Installed. Please Check System." Error message	BobTheLoveGoat	Electronics	2	30th March 2007 20:28
Alloys Other Paintcode Civic "Storm"- Wheels ?	AndreasSweden	Wheels, Tyres, Suspension and Brakes	4	5th March 2007 08:30


This thread is about: 16" vs 17" is milage adjusted or is it 5% off?, it's in Wheels, Tyres, Suspension and Brakes at the Honda Civic forum Civinfo; I am planning to buy 16" tyres for winter use, to get a safer and smoother ride. Is the car somehow adjusting the milage when ...

20th January 2008, 10:42	#2 (permalink)
Nick7 Supporter Triangular Exhaust Join Date: 10th August 2006 Location: Croatia Posts: 451 Thanks: 0 Thanked 1 Time in 1 Post iTrader: (0)	225/45/17 vs. 205/55/16 difference in diameter is just 0.4%, and thus speed reading difference is 0.4%, which is basically nonexistant.

20th January 2008, 11:07	#3 (permalink)
civicfan Supporter Magic Rear Seat Join Date: 13th September 2007 Posts: 757 Thanks: 1 Thanked 1 Time in 1 Post iTrader: (0)	Putting it yet more simply, 15,16,17 or whatever inch is the diameter of the alloy NOT the wheel

20th January 2008, 11:13	#4 (permalink)
twad Valve Cap Join Date: 18th November 2007 Location: Norway Posts: 9 Thanks: 0 Thanked 0 Times in 0 Posts iTrader: (0)	I thought that would be about 4% difference, but I might be wrong - I haven't actually measured it just done some calculations on the back of a napkin. If it is just 0,4% then I would agree it is neglible. So, the tyre is always the same, but the alloy is smaller - ah ok.

20th January 2008, 11:55	#5 (permalink)
kenP Supporter Wheelnut Join Date: 12th January 2008 Location: West Midlands, UK Posts: 84 Thanks: 0 Thanked 1 Time in 1 Post iTrader: (0)	A 225/45/17 tyre is 11.5mm shallower than a 205/55/16 tyre, which means that all together the wheel is 2mm different in diameter. To work out the tyre depth it's the first number multiplied by the second then divided by 100.

20th January 2008, 13:14	#6 (permalink)
John Smith Wheelnut Join Date: 1st October 2006 Location: Estonia Posts: 72 Thanks: 0 Thanked 0 Times in 0 Posts iTrader: (0)	Tire/Wheel Combination Calculator