Indeed. I see this same disparity on my 1982 with non-stock 15" aluminums. My speedo reads about 8km/h (about 5 mph) slower than actual speed when traveling at 100km/h (62mph)

The GPS has confirmed this same behaviour on my 2001 Honda CR-V so I'm not too concerned about it - although it's nice to know.

Joe 1982 Vanagon Westfalia Stratford, ON

On 12-Oct-09, at 7:40 PM, Melissa Mourkas wrote:

I have come to the conclusion that I am not driving as fast as my speedometer indicates as people are racing around me and my speedo says I am doing 70 mph (and I thought this 1.9L was just really peppy!). I have 15/65/205 tires/wheels. I have been unable to conduct a test using mile markers as they are nearly non-existent around here and, no, I do not own a GPS. (I like maps). My shift points seem about 5 mph off the marks on the speedometer as well. I followed a thread on the Samba regarding this disparity:

http://www.thesamba.com/vw/forum/viewtopic.php?t=345224

They were claiming as much as 10 mph under at 70 mph (actually traveling at 60 mph). Has anyone on this list experienced this and have you tried this ratio-adjusted speedo cable shown in that thread?

The vendor for the adjusted cable is:

http://www.tacomaspeedometer.com/index/index.php? option=com_content&task=view&id=15&Itemid=28

I apologize if this has been covered ad nauseum in the past. I will try to come up with something more original next time. In the meantime, thanks to all who choose to reply.

Melissa Mourkas '84 Westy Honey Bee Sacramento, CA