chvycmnslvr68
Full Access Member
Different between what and what? Like I said there are two different 19.5" wheels that can be found on bread trucks:
a) one 19.5" wheel has 8 on 6.5" lug pattern which is identical to what older 1-ton dually GM trucks use, hub pilot diameter is also the same 4.56" - if that ain't a direct bolt-on, I dunno what is! Easily identifiable by the four hand holes, it essentially looks just like a normal 1-ton dually wheel only larger. Here is one such wheel on ebay: http://www.ebay.com/itm/170818466160. If you wanna use it on a Ford dually you gotta machine the hub pilot opening from 4.56" up to 4.88".
b) the other 19.5" wheel has 10 on 7-1/4" lug pattern, which in GM vehicles is only used on what are essentially medium-duty applications. This wheel can most commonly be found in 3500HD trucks, but some motorhomes also use it. There are 5 hand holes on this wheel. Here is one such wheel on ebay: http://www.ebay.com/itm/251048758022. The 10 on 7-1/4" lug pattern is used on F-Superduty trucks as well, however those have hub pilot of 5.46" as opposed to the 5.25" hub pilot used on Chevys - as w/ 1-tons, if you wanna upgrade your 16" Ford to 19.5" wheels you will have to machine the hub pilot opening larger.
Does it make sense now?
There are also the WIDE eight pattern and the Wide six 19.5 wheels out there ... like on the Int'l 4300 and the Isuzu trucks .. and there are a standard ten lug like semi's use also in the 19.5 wheels