Re: [Amc-list] 15" rims for Ambo wagon?

[Ken Ames <ameskg@xxxxxxxxx>]

My calculator is just an excel formula. I got the tire sizes and revs-per-mile 
from several different tires sizes and manufacturers and found the 
actual 'average' rpm was about 96% of the calculated. 
235/75x14 calculates to 27.878 inches diameter, so circumference is 87.581 
inches. 63360 inches in a mile gives 723.44 rpm calc. divided by 96% gives 
753.6 rpm actual.
:)

Ken 

Quoting Sandwich Maker <adh@xxxxxxxxxxxxxxxxx>:

> " From: Ken Ames <ameskg@xxxxxxxxx>
> " 
> " The 70 manual says the H78-14s have 749 revs per mile. 
> " Nearest 14s are 235/75 (754) or 255/70 (749) and 
> " for 15s are 235/70 (752 ) and 225/75 (743).
> 
> my 'tire' program - provenance unknown - says
> 
> Specification  Sidewall  Radius  Diameter  Circumference  Revs/Mile 
> Difference
> 235/75-14         6.9in  13.9in    27.9in         87.6in        723       
> 0.0%
> 255/70-14         7.0in  14.0in    28.1in         88.1in        719       
> 0.6%
> 225/75-15         6.6in  14.1in    28.3in         88.9in        713       
> 1.5%
> 235/70-15         6.5in  14.0in    28.0in         87.8in        722       
> 0.3%
> 
> the revs/mile doesn't agree with ken's data but i don't know how it
> calculates it.
> 
> many '80s rwd mopars - lebaron, mirada, etc; all volare derivatives
> afaik - have 15x7 steel rims that fit amcs perfectly, and would be
> just right for 235/70s but of course don't take amc hubcaps but would
> take 15" amc wheelcovers.  i imagine 15x7 mopar aluminum rims would
> fit just as well but haven't tried them.
> ________________________________________________________________________
> Andrew Hay                                  the genius nature
> internet rambler                            is to see what all have seen
> adh@xxxxxxxxxxxxxxxxx                       and think what none thought
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