series 1 rx8 with r3 wheels
series 1 rx8 with r3 wheels
i recently purchased R3 wheels from the classified section =)
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From: Northeren VA
Well, aside from finding those radar things cops set up, and seeing if it matches your car, you could get a friend to set their cruise to say, 70, and see if it's showing 70 for you. If it's reading fine at highway speeds, it should be fine at lower speeds, such as 40, but you could check those as well.
I put 17's on my Mx6, which called for 15's, and I was about 4-5mph off at highway speeds.(I did also compensate with lower profile tires, to try to get as close as I could to original size, but even still, it was off, and more margin for error at higher speeds.)
I put 17's on my Mx6, which called for 15's, and I was about 4-5mph off at highway speeds.(I did also compensate with lower profile tires, to try to get as close as I could to original size, but even still, it was off, and more margin for error at higher speeds.)
Thread Starter
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Joined: Apr 2011
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From: Northeren VA
Well, aside from finding those radar things cops set up, and seeing if it matches your car, you could get a friend to set their cruise to say, 70, and see if it's showing 70 for you. If it's reading fine at highway speeds, it should be fine at lower speeds, such as 40, but you could check those as well.
I put 17's on my Mx6, which called for 15's, and I was about 4-5mph off at highway speeds.(I did also compensate with lower profile tires, to try to get as close as I could to original size, but even still, it was off, and more margin for error at higher speeds.)
I put 17's on my Mx6, which called for 15's, and I was about 4-5mph off at highway speeds.(I did also compensate with lower profile tires, to try to get as close as I could to original size, but even still, it was off, and more margin for error at higher speeds.)
lol or use a tire calculator 225/40/19 (stock size for r3) is almost the same as 225/45/18. Less than 1% difference 245/35/19 is almost the same as 245/40/18 and is a decent upgrade.
Last edited by J8635621; May 29, 2011 at 04:53 PM.
Lol is right. It's not JUST the wheel size...it's the rolling diameter of the wheel + tire. The 19's have a lower profile tire mounted so the overall size hardly changes.
Looks good tho, love those wheels just wish they were offered in the non-graphite color.
Looks good tho, love those wheels just wish they were offered in the non-graphite color.
It will be PERFECT
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Joined: Apr 2011
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From: Northeren VA
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From: Cacti Land, AZ
Easiest way would be with a GPS. Take the car to the highway, and simply compare your speed with the speed detected by your GPS.
What was your previous tire size? Each time you change tire/wheel size, more likely your speedo will be off - sometimes just slightly. In situations where the tire size increase is really huge, then not only your speedo will be off but you will also lose power. Ideally, in situations like that you would want to put lower gears (numerically higher) in your differential, so that you can compensate. I seriously doubt that is your case though.
BTW, remember that Series II came with lower differential gears (numerically higher) supposedly to help acceleration at the lower end - at the expense of sacrificing top speed. So one could easily see why Mazda decided to add 19" wheels to the R3, as they already put different gears in the differential to begin with. I believe Series II also came with different gears in the tranny - although I'm not sure about that.
If your speedo is really off - which I doubt - and if it bothers you, then you can always get one of these http://www.dakotadigital.com/index.c...rod/prd126.htm
Your car looks awesome with those wheels!!!!!
What was your previous tire size? Each time you change tire/wheel size, more likely your speedo will be off - sometimes just slightly. In situations where the tire size increase is really huge, then not only your speedo will be off but you will also lose power. Ideally, in situations like that you would want to put lower gears (numerically higher) in your differential, so that you can compensate. I seriously doubt that is your case though.
BTW, remember that Series II came with lower differential gears (numerically higher) supposedly to help acceleration at the lower end - at the expense of sacrificing top speed. So one could easily see why Mazda decided to add 19" wheels to the R3, as they already put different gears in the differential to begin with. I believe Series II also came with different gears in the tranny - although I'm not sure about that.
If your speedo is really off - which I doubt - and if it bothers you, then you can always get one of these http://www.dakotadigital.com/index.c...rod/prd126.htm
Your car looks awesome with those wheels!!!!!
Last edited by pistonhater; Jun 4, 2011 at 08:45 PM.
