Wider rims, speedometer error?

Wheels, tires, suspensions, brakes etc.

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Mr.HacKeR
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Post by Mr.HacKeR » 03 Jan 2012, 10:39 pm

Hey guys

I picked up a pair of lenso's (Road and Terrain). I believe my original Nissan rims were 7.5 x 17,but the lenso rims are 8 x 17, I put them on the original tire (215 55 r17). My only concern is will that affect the speedometer? I'm aware of the website that calculates the error and all, but I don't know how to use it :$

Oh and one more thing, if I balanced the rims, removed them from the tires and then put them back on, do I have to balance them again?

Thanks

and sorry if this is a dump question, I really don't know much about tires and rims :roll:

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Ozimandius
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Post by Ozimandius » 04 Jan 2012, 8:05 am

Changing the dimensions of the rims/tyres from stock will affect your speedo.

Use the following 2 calculators to calculate by how much your speedo is off, keeping in mind the dimensions of the stock tyre and the new tyre.

http://www.1010tires.com/tiresizecalculator.asp

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

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kartoos100
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Post by kartoos100 » 04 Jan 2012, 9:01 am

Your rolling diameter remains the same if you have used the same Dia wheel (17 inch) and the same dia tire (215/55/17). this means your speedo will remain unaffected.

AFAIK, the wheels are balanced with the tires on. Removal of tires from the rims necessitate the need for balancing again.

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dennisp
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Post by dennisp » 04 Jan 2012, 10:18 am

what he said^^

BTW, if anyone has this issue, I have a 'yellow box' brand new at my house. Do a google on it. It adjusts the signal to the speedo so your odometer and speedo show the same. I had one on my S2000 that had 18's and 4.55 gear, worked a treat.

Also, FYI, your ODOMETER also changes with larger rims etc. Meaning you drive 10000kms and your odo shows 11000 for example :|

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Mr.HacKeR
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Post by Mr.HacKeR » 04 Jan 2012, 4:08 pm

Thanks for the info. (Y)
Im back on my stock rims now. I didnt balance the wheels again, but they seem fine no vibrations at all.
I was thinking of getting new tires 225 50 17, because i noticed that the suspension seemed to be suffering from the wider rims.. Will this help?



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