Info needed: Streetable CMP truck

[Bob Phillips]

I think Bob C. has preempted my question about roadspeeds on stock 15cwt drivelines. I have had severaal roadworthy CMPs over the years and could never achieve speeds any where near 50mph without fear of engine destruction or vehicle instability resulting in catastrophe.
I have 20 inch wheels and tires on my current 15cwt chev it it wont do 50mph
without fear of imminent disaster.
So what experience do others have on this question?

[chris vickery]

60MPH in a 12 cab CMP. Not the most intelligent choice, but back in the day that’s what she could do.. Was it safe? Foolhardy? Probably

[Harry Moon]

in 2005 coming home on our first big freedom convoy I had on a set of 1100x20 on my C15A, we hit about 65 mph when we just had to pull out and pass an LSVW. Only time I ran the big tires on the C15A.
I regularly cruise at 50 mph (gps confirmed) in my C60L with 1100x20's with the 235 with Fentons.

[Grant Bowker]

Canada's Fighting Vehicles lists maximum speeds between 40 and 50 MPH. The maximums do vary within the same basic model (eg. C60) which I assume may be due to weight as to the best of my knowledge all C60 had the same power, gearing and tires.

[Harry Moon]

Originally Posted by Grant Bowker

Canada's Fighting Vehicles lists maximum speeds between 40 and 50 MPH. The maximums do vary within the same basic model (eg. C60) which I assume may be due to weight as to the best of my knowledge all C60 had the same power, gearing and tires.

I imagine with the 216 and 10.50x20 tires that is the upper limit.
Way more useable RPM with the 235 and a few MPH from the 1100 tires.

[Hanno Spoelstra]

Very usable info, will digest and get back on this subject later

[Lang]

Here is a simple 60mph chart Easy to figure out revs at any speed eg for 40mph just do the 4/6 calculation, for 55 do 5.5/6 and 35 do 3.5/6 etc.

When measuring the tire height do it from the ground to centre of the axle and double. This is your true radius and diameter.