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my physics teacher made a good point today


an mileage odometer records revolutions per round (revolutions of wheel spin)
proportional to mileage

an mileage odometer is specified for a specific oem rim and tire size
dependancy on tire size and rim size determines the accuracy of the odometer


it is designed to be used for example, a 15"inch oem rim and tire
and say a certain number of revolutions determines a mile

so if we were to upgrade to a 17"inch rim with medium size profile tires


then we are to trick the odometer in thinking we go more miles than actually recorded?






its difficult to explain because i'm a fob but you get the big picture

input, comments, opininons?

 
Rep Power: 425

Ummm... thats what the Tire Calculator is for. As long as you keep the overall diameter of the rim and tire the same, the speed read by the car is the same because the axle rotates at the same speed. Get shorter tires, the speed of the axle gets faster, thus your speedometer reads high. Too fat of a tire, the axle goes slower and your speedometer goes with it.

 
Rep Power: 316

good point on that ....Boilermaker


but 60% of the population (i'm part of it)
disregard the that technical stuff and slap
on whatever has good tread life and fits.


hmmm.....maybe i should really take this into account


i have an HX and oem rim is 14"inch
but i currently have 00 SI rims (03 EX alloys)
with Michelin Tires


am i in trouble?

 
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if i wanna get 17's, what do y'all suggest i wrap 'em in.. 205/45/17 or 215/45/17's?

 
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215/45 defantly

 
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cool, thanks.. i was leaning toward the wider tire myself, but i wanted outside opinions..

 
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i thought the odometer and speedometer readings are based on trannies? becuase wheels are not accuate sources, such as driving long distances and curves, inside wheels will be going at a different speed compared to the outer wheels. and the inner wheels in that curve will travel less. im mean there are speed ssenors on wheels, but i think those for abs instead. i had an old 92 corolla before the vic. and the odometer and speedometer broke. i found that the cable running from the tranny to the dash broke. correct me if im wrong on.

i guess the tranny speed could be proportionate to wheel speed? but like quote, im not sure if the odometer is based on wheel revolutions exactly becuase its just too inaccurate.

 
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i have 205 and its no problemo ... even if it changes it is only like 1 or 2 mph so its really no biggie

 
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the speedometer, i think, is on the axle of the drive wheels. It reads the revolutions there, and it then calculates them since it knows what size the OEM wheels are, and you have mileage. Just calculate your tires and if you have the same overall diameter, you're fine. On my dad's old explorer, we upgraded the wheels to 16's (from the factory!) and they didnt recalibrate the mileage...so when the spedometer said 55, you were really going closer to 60. It was weird

 
Rep Power: 375

get 205/40/17. I have 215/45/17 now and they have real issues with lowering and crap. Plus, the lower sidewall will allow less flex and create better handling. Better yet, Ill sell you my falken 451's:-p

 
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Just delt with a guy at work who had a 2003 Denali on 24s, and He got pulled over doing 67, while his spedometer only said 60. I knew a bigger diameter would offset your spedo, but damn, 7mph?

 
Rep Power: 289

road and track tested the a stock c class, the previous generation. the speedometer was off by 5-6 miles per hour. and thats not with aftermarket. the speedometer is only an estimation. maybe some cars are just not calibrated well

 
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i would rather get 215/40 because of more rubber to the ground

 
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i dunno what to do now

 
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i have 205/45 17's, and my spedo is correct now....i work for the police so i had someone radar me :-) i have an LX also, had the 14inch hubcaps too

 
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215/45 for sure...more meat on the ground, better control and if you hit a small pot hole it's not going to bang your rimz all up. plus they are still damn lo pro.
good luck.
(and it is total stock size. your spedo wont be off)

 
Rep Power: 513

^^ thas what i was thinking.. i went to the tire calc, and the 215/45's were the most accurate to stock (.64% slow)

 
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hey , i put 195-50-15 Yokohama AVS ES100's. on my civic coupe, wil that mess up my miles on my odometer or my mph?

 
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its a EX 03

 
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If you were to upgrade your tires, why did you get pizza cutters? less grip on the road and higher profile so they are going to roll...check the tire calc on the home page to let you know where your at...but next time you get tires get the widest and moderatly shortest sidewall...IIIFFF you want better handling that is...
P.S. (Those tires are huge)

 
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are u talking about my tires? what is wrong with my tires! they came with my rimswheels

 
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im running 205/45-17s right now...going to 215/40-17s as soon as these run down (if i dont get bigger rims first)

 
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are those tires as big as stock tires? and will they give me better performance then the tires i have now?

 
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Yea, i was talking about your tires...your wheel/tire package was lacking in the tire selection because you probably got good rims. they like to sell a good rim w/ crappy tire for a descent price. The stock tires are HUGE! and they are very skinny...Yours aren't really that wide which helps the most with traction(wider), and they have a pretty big side wall. (small sidewall will help cornering and decrease body roll) Basicly the wider and lower profile of the tire on the larger of the rim will give you the best handling. More meat on the ground so to say...

When your's wear out i suggest 215/40 or 215/45 depending on your road conditions...

 
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i thought 195-50-15 Yokohama AVS ES100's were performance tires? can seomeone tell me what tires i should get, like a specific tire? not for track use, but for street use? i want a really high performance tire though! what do u guys suggest? my rims are 15x6, thanks

 
Rep Power: 335

get 205/40/17

i have 215/45/17 with a progress spring drop. the rear has negative camber. i purchased the SPC camber kit, but if i correct the rear camber the sidewalls of the tires will rubb the fender.

so again i would suggest 205/40

 
Rep Power: 513

how much is the drop on the progress springs?