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Shrug64
 Post subject: Original tire size
PostPosted: Sun Jun 12, 2011 1:36 pm 
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TBI Slant 6

Joined: Mon Sep 20, 2010 1:54 pm
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Location: Laveen, AZ
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What was the original tire size for 13" rims?

Thanks.

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1964 1/2 Barracuda
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emsvitil
 Post subject:
PostPosted: Sun Jun 12, 2011 1:59 pm 
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Supercharged

Joined: Thu May 12, 2005 11:50 pm
Posts: 6291
Location: So California
Car Model: 64 Plymouth Valiant
6.50 13

About 24.7" diameter and 6.50" total width.

Fit on 13 x 4.5" rim


The radial tire of correct diameter is a 185 80 13 (but it's wider).

The 185 tires are very hard to find now.


Best bet is to goto 14" rims.

Use a 185 75 on the 14 x 4.5 and
195 70 or 205 70 on the 14 x 5.5.

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64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

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FrankRaso
 Post subject:
PostPosted: Tue Jun 14, 2011 7:32 am 
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Turbo Slant 6

Joined: Fri Apr 16, 2004 10:50 am
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Location: Stevensville, ON
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If you don't want to change rims, Coker Tire still carries 13" tires in both 6.50-13 and P185/80R13 sizes.
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Shrug64
 Post subject:
PostPosted: Tue Jun 14, 2011 9:48 am 
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Joined: Mon Sep 20, 2010 1:54 pm
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Location: Laveen, AZ
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Well I found a 175/70/13 at Pep Boys. 4 tires mounted and balanced only 255.10!

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1964 1/2 Barracuda
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Joshie225
 Post subject:
PostPosted: Tue Jun 14, 2011 10:12 am 
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Supercharged
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Joined: Thu Jan 27, 2005 8:32 pm
Posts: 7834
Location: Portland-ish
Car Model: Fiat 500e
Quote:
Well I found a 175/70/13 at Pep Boys. 4 tires mounted and balanced only 255.10!
Did you consider that those are 2" shorter than original?

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FrankRaso
 Post subject:
PostPosted: Tue Jun 14, 2011 11:24 am 
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Turbo Slant 6

Joined: Fri Apr 16, 2004 10:50 am
Posts: 660
Location: Stevensville, ON
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You would need to switch from a 17-tooth speedometer gear to a 19-tooth gear to keep your odometer & speedometer accurate with a P175/70R13 tire.

Tire Upgrades
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Shrug64
 Post subject:
PostPosted: Tue Jun 14, 2011 11:48 am 
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I have no idea how to do that. How much difference could it really make?

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FrankRaso
 Post subject:
PostPosted: Tue Jun 14, 2011 12:41 pm 
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Turbo Slant 6

Joined: Fri Apr 16, 2004 10:50 am
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Location: Stevensville, ON
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Using the P175/70R13 tire should make your odometer record about 11% more miles than actually traveled. At an indicated 60 mph you would actually be traveling at about 54 mph (if your speedometer was still within calibration).
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Shrug64
 Post subject:
PostPosted: Tue Jun 14, 2011 2:47 pm 
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TBI Slant 6

Joined: Mon Sep 20, 2010 1:54 pm
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Location: Laveen, AZ
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Well that is the closest tire I can find. I guess reading a little slow is better than reading a little fast. At least I will never get a speeding ticket.
I would not even begin to know how to adjust my speedo.

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1964 1/2 Barracuda
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Doc
 Post subject:
PostPosted: Tue Jun 14, 2011 3:49 pm 
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Location: Working in Silicon Valley, USA
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You will need to install a different speedometer drive gear, (19 tooth) at the other end of the cable, where it goes into the tailhousing of the transmission.
DD

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Shrug64
 Post subject:
PostPosted: Tue Jun 14, 2011 4:44 pm 
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Where would one get such a thing?

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FrankRaso
 Post subject:
PostPosted: Tue Jun 14, 2011 7:19 pm 
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Turbo Slant 6

Joined: Fri Apr 16, 2004 10:50 am
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Location: Stevensville, ON
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I got my 16-tooth pinion gear from Brewer's Performance.
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Joshie225
 Post subject:
PostPosted: Tue Jun 14, 2011 7:32 pm 
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Supercharged
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Location: Portland-ish
Car Model: Fiat 500e
You still have the original trans in the car? If so it's a different gear than the '66+ models. The selection for the earlier speedometer drive gears is more limited and they cost more.

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Shrug64
 Post subject:
PostPosted: Tue Jun 14, 2011 9:03 pm 
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Joined: Mon Sep 20, 2010 1:54 pm
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Location: Laveen, AZ
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It is the 727 that came with the car originally.

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Tony
1964 1/2 Barracuda
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Shrug64
 Post subject:
PostPosted: Tue Jun 14, 2011 9:07 pm 
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Joined: Mon Sep 20, 2010 1:54 pm
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Location: Laveen, AZ
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So is this what I need?

http://www.brewersperformance.com/prodd ... ?prod=SP19

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