odometer and non stock tires

[111prez]

may tanong ako

may epekto ba sa odometer ang non stock tires?

i read in another forum that using, say for example, oversized non stock tires affects your speedometer reading. lets say your stock tires are 265s, if you change to 275s (same rims), there is a 1% difference in the speedometer reading; or if you change to 285s, there is a 7% difference.

to illustrate, if on the stock 265s your speedometer reading is 60kph, then on the 275s, the speedometer will only read about 59kph (or thereabouts) or much slower. tama ba? o baliktad? the main thing is that there is a difference

if this is the case, is the odometer reading also affected?

by the way, nag search na rin ako and i was not able to find a thread specifically discussing this. kung medyo kulang ang search ko, paki post nalang ng link dito

salamat sa lahat

[BlackPrince]

may tanong ako

may epekto ba sa odometer ang non stock tires?

i read in another forum that using, say for example, oversized non stock tires affects your speedometer reading. lets say your stock tires are 265s, if you change to 275s (same rims), there is a 1% difference in the speedometer reading; or if you change to 285s, there is a 7% difference.

to illustrate, if on the stock 265s your speedometer reading is 60kph, then on the 275s, the speedometer will only read about 59kph (or thereabouts) or much slower. tama ba? o baliktad? the main thing is that there is a difference

if this is the case, is the odometer reading also affected?

by the way, nag search na rin ako and i was not able to find a thread specifically discussing this. kung medyo kulang ang search ko, paki post nalang ng link dito

salamat sa lahat

sir, HTH ... http://www.miata.net/garage/tirecalc.html

[ssaloon]

i dont think there's an effect on the odometer since it measures the engine speed and not the vehicle's actual speed.

[ian_rex]

i dont think there's an effect on the odometer since it measures the engine speed and not the vehicle's actual speed.

sir, correction, to measure engine speed, we refer to tachometer. to measure the vehicle's speed, we refer to the speedometer. in honda, the speedometer is hooked-up to the tranny, via ecu.

however, upsizing the rims would affect the speedo reading. because the computation in the differential to the wheel size is changed. but, the good news is, if i have a stock rim with size 185/65 r14 and i want it upgraded to the rim size, tire width and the aspect ratio, to have the same reading i would have to install a 195/55 r15. for the 16 rims, size would be 205/45 r 16.

see the trend? as the rim size and tire width increases, the aspect ratio (sidewall) decreases. this way, the speedo reading would remain as the stock, since we are after the size of the wheel as whole rather than the rims and tire width alone.

just a thought.

[ssaloon]

sir, correction, to measure engine speed, we refer to tachometer. to measure the vehicle's speed, we refer to the speedometer. in honda, the speedometer is hooked-up to the tranny, via ecu.

however, upsizing the rims would affect the speedo reading. because the computation in the differential to the wheel size is changed. but, the good news is, if i have a stock rim with size 185/65 r14 and i want it upgraded to the rim size, tire width and the aspect ratio, to have the same reading i would have to install a 195/55 r15. for the 16 rims, size would be 205/45 r 16.

see the trend? as the rim size and tire width increases, the aspect ratio (sidewall) decreases. this way, the speedo reading would remain as the stock, since we are after the size of the wheel as whole rather than the rims and tire width alone.

just a thought.

whoops onga pala hehehe! my bad

[ARB]

it depends on how you are using your odometer.

if for engine mileage/change oil intervals same pa rin yan because usually speedo cables are attached to the tranny.

but if for distance traveled using maps or directions its not as accurate since bigger tires cover more road. and speed hindi na accurate as indicated sa speedo.

[Mojo]

affected ang accuracy ng both speedo at odometer.

try this to know how much + or - your incurring


http://www.miata.net/garage/tirecalc.html

[theveed]

What he said ^^^

Just to add, sa mga ibang countries, nandadaya mga taxi by using smaller wheel/tire combo to facilitate more revolutions per km.

[niky]

What he said ^^^

Just to add, sa mga ibang countries, nandadaya mga taxi by using smaller wheel/tire combo to facilitate more revolutions per km.

:lol: hindi ko naisip yan, ah!

damn taxi drivers!

[111prez]

teka teka, baka, now i am confused

so, to recap, change in tire size affects speedometer. that i understand from the links. sa miata.net, speedometer ang pinaguusapan.

but what about the odometer? mukhang apektado ata ang consensus. but by how much? is it the same as the effect on the speedometer?

yung engine speed or revolutions is tachometer.

but the odometer also measures total distance travelled. it is also your guide on when to do your PMS like your 5K PMS and so on

[boybi]

teka teka, baka, now i am confused

so, to recap, change in tire size affects speedometer. that i understand from the links. sa miata.net, speedometer ang pinaguusapan.

but what about the odometer? mukhang apektado ata ang consensus. but by how much? is it the same as the effect on the speedometer?

yung engine speed or revolutions is tachometer.

but the odometer also measures total distance travelled. it is also your guide on when to do your PMS like your 5K PMS and so on

the odometer reading is derived from the tachometer and the speedometer. if you are going to know the distance travelled with non-stock tires, it will not be accurate. but for PMS purposes, you can still stick to its readings. ganun din naman kasi ang talagang tinakbo ng engine.

[Turbocharger]

San kaya pwede magpa recalibrate ng speedometer to maintain its accuracy after upgrading your stock tires?????????

[ian_rex]

sir, naisip ko lang. di naman nagbabago ang reading sa odometer, kung distance ang pinaguusapan. constant naman ang distance from point a to point b considering na nagpalit ka ng bigger rims. sample ulit. yung tranny ng civic SiR at tranny ng civic lxi iisa lang pero same ang pms nila, pero magkaiba ang rim size (13 sa lxi at 15 sa SiR) ng both.

[Loki]

sir, naisip ko lang. di naman nagbabago ang reading sa odometer, kung distance ang pinaguusapan. constant naman ang distance from point a to point b considering na nagpalit ka ng bigger rims. sample ulit. yung tranny ng civic SiR at tranny ng civic lxi iisa lang pero same ang pms nila, pero magkaiba ang rim size (13 sa lxi at 15 sa SiR) ng both.

although they may have the same tranny, could be that distance per revolution are calibrated differently..

or..

the overall tire diameter are the same (eventhough rim size are different).

definitely the speedo and odo are both affected, but for thousand KM PMS
purposes, not significant.

[boybi]

the overall diameter of the wheel of the LXi and SiR are the same or within the threshold for accurate speedometer reading.

[Mojo]

tacho is separate sa odo/speedo cable.

yung tach is connected sa ignition system, and not sa tranny. so naka idle ka, tuloy tuloy parin yan.

apektado ang odometer/speedo accuracy pag nag palit ka ibang size na tires

[111prez]

tinanong ko rin ito dahil for purposes of computing your gas mileage, i usually use as a basis the odometer to determine my total km travelled.

so the more accurate the odometer, the more accurate the mileage computation.

to reiterate the question of turbocharger, saan kaya puede mag pa calibrate nito? or is it advisable to calibrate?

[revoGSX]

paano i-calibrate ang speedometer to reflect the non-stock tires?

[111prez]

up ko lang ulit ito

i just changed my 275/70R16 tires to 265/70R16 tires. in short, niliitan ko siya

kanina, after the tire change, wheel balancing etc, i test drove the vehicle on the skyway. at the same time, naka on rin ang GPS ko

sa speedometer reading, the needle indicated that i was running at 100kph BUT sa GPS reading i was running only at about 85kph. at the speedometer reading of 160kph, the GPS reading was only about 140kph

so which is more accurate? :question:

[Lancie]

mga sir, IMO lang po, the overall diameter ng gulong ng kotse ay nakaka-apekto nga pala tlga speedo/odometer reading. parang consept ng ratio.. basta! hindi ko po maexplain ng mabuti.. hehe parang ganito, 205 vs. 175.. ang 1 ikot ng 205 ay 1.3 ikot para sa 175.. kaya, masmabilis ang reading ng smaller tire diameter kesa sa bigger tire diameter.. my two cents! thanks!!!