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Old 10-20-2023, 11:13 AM   #1
MJN
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Re: What was the factory tire size on 87?

Quote:
Originally Posted by bennylava View Post
What are the characteristics of both these tire sizes? It would seem that the larger tire was considered to be an upgrade. Was there no advantage to the smaller tire?
Different tire options also impacted the GVWR since different tires have different load ratings, this load capacity guide goes into detail on front/rear spring and different wheel/tire combos and even air pressure and how it changes GVWR.
https://67-72chevytrucks.com/vboard/...d.php?t=845046
Page 42 of this PDF shows the different tire sizes that were available
https://www.gm.com/content/dam/compa...olet-Truck.pdf
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Old 10-20-2023, 11:47 AM   #2
Keith Seymore
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Re: What was the factory tire size on 87?

Quote:
Originally Posted by MJN View Post
Different tire options also impacted the GVWR since different tires have different load ratings, this load capacity guide goes into detail on front/rear spring and different wheel/tire combos and even air pressure and how it changes GVWR.
https://67-72chevytrucks.com/vboard/...d.php?t=845046
Good info.

The GVWR is established not only by how much weight the vehicle can carry, but also if you can get that weight moving and stopped. That includes rear axle ratio, too.

When I was establishing GVW (and GCW) ratings the final capping run was if you could get the load moving up the 16% grade at the Milford Proving Ground from a standing stop.

Quote:
Originally Posted by MJN View Post
Page 42 of this PDF shows the different tire sizes that were available
https://www.gm.com/content/dam/compa...olet-Truck.pdf
Yes - as linked in Post #2 of this thread.

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Last edited by Keith Seymore; 10-20-2023 at 11:52 AM.
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Old 10-21-2023, 12:32 AM   #3
bennylava
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Re: What was the factory tire size on 87?

According to that PDF, it looks like p225 and p235 tires were available. Or at least usable.
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