Speedo accuracy

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Speedo accuracy

Post  RedTide on Wed Jun 30, 2010 1:23 pm

What can I expect with a GYTT 205/60-16 vs a Michelin 205/65-16?

RT

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Re: Speedo accuracy

Post  nodakbassmaster on Wed Jun 30, 2010 1:40 pm

slight difference with the 65 being closer to right...

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Re: Speedo accuracy

Post  meangrn1800 on Fri Jul 02, 2010 4:31 pm

Try this site. Punch in your current tire size and your new tire size and it shows you all sorts of stuff

http://www.barretire.com/calculator.htm
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Re: Speedo accuracy

Post  RedTide on Sat Jul 03, 2010 8:08 am

I found a couple of others too. Looks I will go with a Michelin Hydroedge 205/65-16 as it will give me pretty accurate mph, compared to the stock or a 205/60-16. Plus a friend with a Retro had a MH and liked it much better than his current GYTT.

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Re: Speedo accuracy

Post  ToMang07 on Sat Jul 03, 2010 8:16 am

meangrn1800 wrote:Try this site. Punch in your current tire size and your new tire size and it shows you all sorts of stuff

http://www.barretire.com/calculator.htm
THAT is actually a pretty cool calculator...thx!
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Re: Speedo accuracy

Post  RedTide on Sat Jul 03, 2010 8:26 am

This one works pretty good too. http://www.tacomaworld.com/forum/tirecalc.php

With the stock tire mine reads a -5 mph from actual speed via a GPS at 65 mph. The MH 205/65-16 looks like I should end up at about a +1~2 from actual speed at 65.

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Re: Speedo accuracy

Post  ToMang07 on Sat Jul 03, 2010 2:14 pm

Hmmmm......

Curious whether I should go with a 60 or a 65 now..... scratch

Not sure where I have the 1300 FD already... and w/ the 200/66/16 metz I am running 1-2 OVER at 65 indicated. Suspect

I guess I ned to crunch the numbers....with the calculator and (gu)estimate which would be better.... study
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Re: Speedo accuracy

Post  nodakbassmaster on Sat Jul 03, 2010 2:18 pm

Probly the 60 then unless you wanna further raise the gear ratio and lower your RPMs at given speed....

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Re: Speedo accuracy

Post  ToMang07 on Sat Jul 03, 2010 2:26 pm

nodakbassmaster wrote:Probly the 60 then unless you wanna further raise the gear ratio and lower your RPMs at given speed....

I'm OK with lowering the RPM's.... What a Face

It's losing torque that I'm worried about. That and messing up the speedo worse than it is. Suspect
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Re: Speedo accuracy

Post  ToMang07 on Sat Jul 03, 2010 2:34 pm

After plugging the numbers into the calculator, it basically says:

If speedo read 65, actual with the "60" would be 63.64.

If speedo read 65, actual with the "65" would be 65.62.

So basically, my speedo would be about correct id I go with the 60, but over a hair more if I go with the 65.

Im no good at ath, but wouldn't I lose torque if I add the taller tire? Suspect
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