MikeyMike80 Member 23 Member For: 15y 10m 8d 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 Share on other sites More sharing options...
gregor Member 459 Member For: 15y 8m 11d 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 Share on other sites More sharing options...
typhoon_freak Cryptic Clothing Company Donating Members 4,556 Member For: 15y 9m 22d 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 Share on other sites More sharing options...
Ace blind leading the blind Member 3,657 Member For: 15y 7m 22d Gender: Male Location: Mt Alford, Queensland Posted 02/04/09 03:48 AM Share Posted 02/04/09 03:48 AM 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 Share on other sites More sharing options...
benjam Member 137 Member For: 19y 29d 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 Share on other sites More sharing options...
wrecku Member 170 Member For: 15y 6m 27d 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 Share on other sites More sharing options...
TCR Donating Members 138 Member For: 15y 8m 20d 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 Share on other sites More sharing options...
brownhornet Donating Members 124 Member For: 15y 9m 14d Gender: Male Location: Perth Posted 02/04/09 11:14 PM Share Posted 02/04/09 11:14 PM http://www.1010tires.com/TireSizeCalculator.aspvery cool link scatrd! Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now