DarkSideAccord
nadeshiko fobz ftw..
your speedometer will be incorrect.... it'll always be showing a higher speed
question about going lower with smaller tire diameter
- Thread starter sonni_kuba
- Start date
agginline86
Well-Known Member
I don't know what your definition of negligible is, but my speedo is always off by about 5mph. Now, 0.01% of 50,000mph is 5mph .. so if you're in a rocket ship, then yes, it's negligible.
Brad2274
Well-Known Member
tire size speed error at 60mph your speedo will say 62.6mph, difference goes up as speed increases.
If I'm not mistaken, a smaller circumference of tire will cause your actual speed to be less then the speedometer reading.
Setup he wants
23.9 diameter = 75.08406442079605 circumference (stretch not taken into account)
Current setup
25.1 diameter = 78.85397560510381 circumference
Factory wheel & tire setup
25.49212598425197 diameter = 80.08587571651147 circumference
That comes out to -3.68803088803089 mph less then the speedometer reading @ 60 mph (agin that's not taking the stretch into account)
Where did 0.001% come from?
Speedometer calculator for aftermarket wheels/tires
sonni_kuba
6GA Supporting Member
Actually, the difference compared to stock 205/60/16 is 6.9%
When you're speedo reads 60 mph you're actually going 55.9 mph
From http://www.miata.net/garage/tirecalc.html
Either way that's better than if you're going 65 mph when your speedo reads 60 mph
When you're speedo reads 60 mph you're actually going 55.9 mph
From http://www.miata.net/garage/tirecalc.html
Either way that's better than if you're going 65 mph when your speedo reads 60 mph
truWarier02
Well-Known Member
Meh... 215/40, lower car to 23" f-to-g, and call it a day.
Valet
IS300 SX > Accord
+1000
DarkSideAccord
nadeshiko fobz ftw..
Go ride a bmx,, then a mountain bike. Tell me which one needs to pedal faster to achive the same speed?
I'm talking about tire circumference & I thought I covered it pretty good......
