MikeyMike80 Member 23 Member For: 16y 10m 10d Gender: Male Location: Sunshine Coast, Queensland Posted 02/04/09 03:25 AM Share Posted 02/04/09 03:25 AM Ok, so I'm not sure if anyone can help me out, but I know that changing tyre size on a car can put the speedo out, my question is, what has to be changed or altered to make the speedo display the right speed.I know on older cars this involved changing a cog or something on the back of the speedo, I assume that this is no longer relavent due to electronic speedos, so does anyone know what has to be done, and who does it?I am looking at putting 19's on my BA XR6T but don't want my speedo to be out at all Link to comment https://www.fordxr6turbo.com/forum/topic/56308-installing-larger-rims-on-my-t/ Share on other sites More sharing options...
gregor Member 459 Member For: 16y 8m 13d Posted 02/04/09 03:43 AM Share Posted 02/04/09 03:43 AM just make sure you get tyres with the appropriate profile. Link to comment https://www.fordxr6turbo.com/forum/topic/56308-installing-larger-rims-on-my-t/#findComment-853696 Share on other sites More sharing options...
typhoon_freak Cryptic Clothing Company Donating Members 4,556 Member For: 16y 9m 24d Gender: Male Location: Brisvages, Capalaba Posted 02/04/09 03:45 AM Share Posted 02/04/09 03:45 AM I didnt think u wud have much speed difference with the 19's... I know a tuner can alter the speedo when your car is on the dyno Link to comment https://www.fordxr6turbo.com/forum/topic/56308-installing-larger-rims-on-my-t/#findComment-853698 Share on other sites More sharing options...
Ace blind leading the blind Member 3,657 Member For: 16y 7m 23d Gender: Male Location: Mt Alford, Queensland Posted 02/04/09 03:48 AM Share Posted 02/04/09 03:48 AM gregor said: just make sure you get tyres with the appropriate profile. it may alter it 1 or 2kph depending on brand but I dont think it will be enough to worry Link to comment https://www.fordxr6turbo.com/forum/topic/56308-installing-larger-rims-on-my-t/#findComment-853701 Share on other sites More sharing options...
benjam Member 137 Member For: 20y 1m Location: Sydney NSW Posted 02/04/09 04:23 AM Share Posted 02/04/09 04:23 AM Hey you may find this useful though I haven't tried it myself. Apparantly you can adjust the speedo in a special calibration mode via the dash! It would be better to just go for a tyre size and profile that has the same overall diameter as what is standard. Cheers. Ben.http://www.fordxr6turbo.com/forum/index.ph...ic=1335&hl= Link to comment https://www.fordxr6turbo.com/forum/topic/56308-installing-larger-rims-on-my-t/#findComment-853719 Share on other sites More sharing options...
wrecku Member 170 Member For: 16y 6m 29d Gender: Male Location: Albury, NSW Posted 02/04/09 04:23 AM Share Posted 02/04/09 04:23 AM (edited) I got this link from another topic on this forum. very helpful and you can just play around with the sizes until your happy with the result. tells you how much the speed will be out either +/-. and it will tell you the % diameter difference.very handy tool indeed.http://www.1010tires.com/TireSizeCalculator.aspsay my stock tyres are 245/45-17, and if I want 20" wheels I would get something like 295/25-20. and my speedo will read approx .5 of km/h slower than normal. Edited 02/04/09 04:29 AM by SCATRD Link to comment https://www.fordxr6turbo.com/forum/topic/56308-installing-larger-rims-on-my-t/#findComment-853720 Share on other sites More sharing options...
TCR Donating Members 138 Member For: 16y 8m 21d Gender: Male Location: Brisbane Posted 02/04/09 05:53 AM Share Posted 02/04/09 05:53 AM Just get some 245/35/19 tyres and your speedo only be about 1% out. Link to comment https://www.fordxr6turbo.com/forum/topic/56308-installing-larger-rims-on-my-t/#findComment-853759 Share on other sites More sharing options...
brownhornet Donating Members 124 Member For: 16y 9m 15d Gender: Male Location: Perth Posted 02/04/09 11:14 PM Share Posted 02/04/09 11:14 PM SCATRD said: http://www.1010tires.com/TireSizeCalculator.aspvery cool link scatrd! Link to comment https://www.fordxr6turbo.com/forum/topic/56308-installing-larger-rims-on-my-t/#findComment-854308 Share on other sites More sharing options...
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