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miscreantgnomie
Samba Member
Joined: October 15, 2005
Posts: 637
Location: Near lackland AFB come and visit
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 Posted: Sun Dec 09, 2007 8:44 am Post subject: How much will a15 inch wheel and rim affect my speedo ? |
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Im using bug rims i guess since mine are 15 inch i think i have 205 75 15 on it . will this affect speedo much ?
Anyone have similar setup:p guess i need to do that gps thing to know for sure.
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62 sc, 62 SO 34, 61 mango, (2) 67 deluxe in crappy shape, 73 thing, 64 ghia,
and some embarassing bays. shhh, I just use them for storage. (hides)
San Antonio (SAAC/VOSA) |
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Towel Rail
Horizontally Opposed
Joined: April 15, 2005
Posts: 4622
Location: SE CR IA US NA PE
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| Posted: Sun Dec 09, 2007 5:07 pm Post subject: |
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It's the overall diameter, not the wheel size, that determines speedometer error. Stock tire is roughly 25.65" tall, your 205/75R15's are over 27" tall.
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1974 Thing -- under the knife
1967 Beetle -- spring/summer/fall driver
1996 Subaru OBW (EJ22, 5-speed, AWD) -- winter car, 3-seasons "don't feel like biking today" car
049 > 070 > 053 > 009 |
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surferdudedav
Samba Member
Joined: May 20, 2004
Posts: 517
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| Posted: Sun Dec 09, 2007 7:42 pm Post subject: |
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my 165-45's make going 35 look like im doing 50! it sucks but if you want to know ask a neightborhood police offficer to let you speed down a quiet street and see if he is willing to clock you...  |
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Captain Spalding
Samba Member
Joined: February 19, 2005
Posts: 2519
Location: . . . in denial.
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| Posted: Sun Dec 09, 2007 11:47 pm Post subject: Re: How much will a15 inch wheel and rim affect my speedo ? |
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| miscreantgnomie wrote: |
Im using bug rims i guess since mine are 15 inch i think i have 205 75 15 on it . will this affect speedo much ?
Anyone have similar setup:p guess i need to do that gps thing to know for sure. |
Comparing the stock tire size of 185R14 to 205/75R15, your speedometer should read 5.7 percent too slow. That's assuming it was accurate to begin with.
There's a nifty online tire size calculator here.
Last edited by Captain Spalding on Mon Dec 10, 2007 11:25 pm; edited 1 time in total |
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miscreantgnomie
Samba Member
Joined: October 15, 2005
Posts: 637
Location: Near lackland AFB come and visit
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| Posted: Mon Dec 10, 2007 8:13 am Post subject: |
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Thanks guys my wife was following me home from our anual cruise to homeless shelter. She said i was going 80 mph at one point :p I guess my speedo is off cause it never said above 72. I never recall being able to go 80 mph in my thing before either. i guess rebuilding motor new pts cap etc etc and rebuilding carb makes car go faster :p A tuned thing is a happy thing 
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62 sc, 62 SO 34, 61 mango, (2) 67 deluxe in crappy shape, 73 thing, 64 ghia,
and some embarassing bays. shhh, I just use them for storage. (hides)
San Antonio (SAAC/VOSA) |
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Ian Epperson
Samba Member
Joined: January 12, 2005
Posts: 2262
Location: Alameda, CA
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| Posted: Mon Dec 10, 2007 9:58 am Post subject: |
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Make sure you've got some kind of temp sensor in there to ensure you're not cooking that new motor. I could top out at 84 MPH in my old T1 motor, but the engine would overheat pretty quickly.
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VW-181 shirts and stickers.
http://ian.epperson.com/vw |
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