From: Patrick Jankowiak (recycler@swbell.net)
Date: Sun May 02 2004 - 22:45:49 PDT
Could we have different tires? I'll get the model numbers off
them, they are the military type, but perhaps they are different
widths available, strange as it seems. Could there also be
different offsets between the wheels? I can certainly put a few
pencils in there!
Verne J. Valentine wrote:
> This report is suspect..
>
> I started this very changeover and had to change back to 9:00 X 20's
> before the change was complete.. The 11:00 X 20's install perfect on
> the rims BUT when they are installed in the duel configuration there is
> very, very, little clearance between the duels.. The clearance is LESS
> than the width of a pencil..
>
> You may be able to put spacers between the duel rims to enhance the
> clearance but that creates another safety issue..
>
> Verne Valentine
> MVPA 20863
> M35A2
>
>
>
>> report: 900x20 vs 1100x20 on M35
>>
>> 900x20 and 1100x20 tires were put on the duals and clearances were
>> measured on an M35A2.
>>
>> The 9.00x20 tires have about 1.75" clearance between the closest
>> surfaces at 50PSI.
>>
>> The 1100x20 tires have about 1.25" clearance between the closest
>> surfaces at 55PSI.
>>
>> From this it seems acceptable that the 1100x20 tires are a good
>> alternative choice for those wishing to slightly reduce the RPM for
>> the same highway speed.
>>
>> Additionally, in my case (not sure about how other trucks run), the
>> engine has always pulled strong up to about 2100 RPM, then gotten a
>> bit flat, till 2650 RPM (max. allowed under load). At 2500-2650 RPM,
>> the turbo seems to be doing its job best and the truck seems to get a
>> 'second wind' which can easily go beyond 2650RPM / 56MPH, but this was
>> not explored.
>>
>> With the 1100x20 tires, at 2500-2650RPM, I could feel this 'second
>> wind' being put to use, loading the engine a bit more, and giving me a
>> few more MPH..
>>
>> The 900x20 tires were about 40" tall.
>> The 1100x20 tires were about 43" tall.
>>
>> This translates to the following data:
>> 2650 RPM = 56MPH(900x20) -> 60MPH(1100x20)
>> 56MPH = 2650RPM(900x20) -> 2465 RPM(1100x20)
>>
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>
>
>
>
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